Flow Measurement and Instrumentation最新文献_第10页

Experimental study on high-altitude characteristics of aviation lubricating oil gear pump 航空润滑油齿轮泵高空特性试验研究

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-11-07 DOI: 10.1016/j.flowmeasinst.2025.103120

Shengfu Zhang , Yibin Li , Wenjun Shi , Wenhui Li , Jianjian Qin

The performance of aviation lubricating oil gear pumps in high-altitude environments is crucial for the safe and reliable operation of aircraft. To obtain the high-altitude characteristic curves of lubricating oil gear pumps and analyze their influencing factors, a performance test platform for aviation lubricating oil gear pumps capable of simulating high-altitude environments from 0 to 12 km was established to investigate the high-altitude characteristics of the lubricating oil pumps. The results indicate that as the inlet pressure decreases, the flow rate exhibits a linear decline across different pressure conditions, while both torque and flow pulsation demonstrate a linear increase. Notably, when the inlet pressure is less than or equal to 30 kPa (corresponding to an altitude of ≥8.5 km) and the outlet pressure exceeds 2.2 MPa, the flow rate decreases sharply, accompanied by a sudden rise in torque and pulsation, along with a rapid increase in the internal lubricating oil temperature. As the rotational speed increases, the flow rate, volumetric efficiency, and torque under different inlet pressures exhibit linear growth. However, when the inlet pressure is less than or equal to 30 kPa (corresponding to an altitude of ≥8.5 km) and the rotational speed exceeds 1800 r/min, the flow rate and torque demonstrate slow growth, while the volumetric efficiency decreases sharply. Concurrently, the flow pulsation increases abruptly to 11.2 %. The high-altitude characteristic inflection points of the lubricating oil gear pump are determined to be approximately 1800 r/min and 30 kPa.

航空润滑油齿轮泵在高空环境下的性能对飞机的安全可靠运行至关重要。为获得润滑油齿轮泵的高空特性曲线并分析其影响因素，建立了能够模拟0 ~ 12 km高空环境的航空润滑油齿轮泵性能试验平台，研究润滑油齿轮泵的高空特性。结果表明：随着进口压力的降低，流量在不同压力条件下均呈线性下降趋势，而转矩和流量脉动均呈线性增加趋势；值得注意的是，当进口压力小于或等于30 kPa（对应海拔≥8.5 km），出口压力超过2.2 MPa时，流量急剧下降，同时转矩和脉动突然升高，内部润滑油温度迅速升高。随着转速的增加，不同进口压力下的流量、容积效率和转矩均呈线性增长。而当进气压力小于等于30 kPa（对应海拔≥8.5 km），转速超过1800 r/min时，流量和转矩增长缓慢，容积效率急剧下降。同时，流量脉动突然增加到11.2%。确定润滑油齿轮泵的高空特性拐点约为1800r /min和30kpa。

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引用次数: 0

Experimental study on the flow measurement method of the spiral throttling element 螺旋节流元件流量测量方法的实验研究

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-11-06 DOI: 10.1016/j.flowmeasinst.2025.103119

Donglei Jiang , Lijun Zhu , Yanzhi Pan , Chunmin Zeng , Juncai Jia , Xiaodong Zhang , Heng Wang , Tan Xiao

This study investigates the flow measurement method for spiral throttle elements through an experimental approach. Several parameters, including flow rate (

Q

), spiral channel diameter (

d

), effective length of the spiral channel (

L

), pressure drop (

D P

) across the spiral channel, and fluid density (

r o u

), were measured to explore the relationship (

K = f (R e)

). A comprehensive set of experimental data was processed and analyzed using normalization, leading to the derivation of a formula for calculating the flow rate (

Q

). The formula’s accuracy was validated through experiments, with results indicating that the maximum absolute error between the calculated and experimental values is 4%.

本文通过实验研究了螺旋节流元件的流量测量方法。通过测量流量(Q)、螺旋通道直径(d)、螺旋通道有效长度(L)、螺旋通道上的压降（DP）和流体密度（rou）等参数来探索两者之间的关系（K=f(Re)）。采用归一化方法对实验数据进行处理和分析，推导出计算流量(Q)的公式。通过实验验证了公式的准确性，结果表明，计算值与实验值的最大绝对误差为4%。

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引用次数: 0

A review of research on the refuelling process of on-board hydrogen storage tanks 车载储氢罐加注过程研究综述

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-11-04 DOI: 10.1016/j.flowmeasinst.2025.103116

Dongwang Ma, Meiqiu Li

The number of articles on hydrogen refuelling of on-board hydrogen storage tanks has increased dramatically over the last 28 years. In this study, We reviewed 99 articles (1980–2024) to analyse research progress in hydrogen refuelling according to the methodology of hydrogen refuelling development history, with special attention paid to ensure the transparency of the review. Literature topics are modelled with the help of LDA (Latent Dirichlet Allocation) machine learning to identify research themes and advances. This paper systematically describes the temperature rise mechanism and characterisation and summarises the temperature rise influencing factors, and analyses the cooling method and hydrogen refuelling quality influencing factors. Although the temperature rise mechanism is now well understood, conflicts persist between temperature rise, filling time, and hydrogen refuelling quality. In view of this, this paper attempts to make insights into the fast hydrogen refuelling technology by exploring and reviewing the literature to provide new ideas for the development of new control strategies and filling technologies for on-board hydrogen storage tanks.

在过去的28年里，关于车载储氢罐加氢的文章数量急剧增加。在本研究中，我们回顾了99篇文章（1980-2024），根据氢燃料发展史的方法分析了氢燃料的研究进展，并特别注意确保综述的透明度。文献主题在LDA （Latent Dirichlet Allocation）机器学习的帮助下建模，以识别研究主题和进展。本文系统地描述了热交换器的温升机理和特征，总结了热交换器的温升影响因素，分析了冷却方式和加氢质量的影响因素。虽然温度升高的机制现在已经被很好地理解，但温度升高、加氢时间和加氢质量之间的冲突仍然存在。鉴于此，本文试图通过对相关文献的梳理和回顾，对快速加氢技术进行深入了解，为车载储氢罐新的控制策略和加氢技术的发展提供新的思路。

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引用次数: 0

Comments on “Numerical modeling and discharge coefficient analysis of semi-elliptical sharp crested weirs” by Parsaie A., BasitNejad M., Bahrami-Yarahmadi M. Parsaie A., BasitNejad M., Bahrami-Yarahmadi M.对“半椭圆尖顶堰数值模拟及流量系数分析”的评论。

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-11-03 DOI: 10.1016/j.flowmeasinst.2025.103118

Ali R. Vatankhah, Zahra Amjadian, Mandana Javadi

This paper discusses the study presented by Parsaie et al. (2025) [1] for determining the discharge equation of semi-elliptical sharp-crested weirs inserted in a rectangular open channel under free flow conditions. The discharge equation of the semi-elliptical weir is deduced by [1] using the energy equation for an elemental strip of the flow and then a computational framework (Simpson's numerical integration) is used to analyze the weir discharge equation. The theoretical discharge equation by [1] is applied to the collected literature data (80 runs), and its results are compared to the observed discharge. For all collected data, the theoretical flow discharges are reported less than the actual flow discharge by [1]. The theoretical flow discharge is an idealization that assumes ideal conditions like uniform velocity and zero energy losses, which are never met in reality. In practice, the actual flow discharge deviates from the theoretical due to factors like viscosity, which creates non-uniform velocity profile and causes unavoidable energy losses. Therefore, the actual flow discharge is always less than or equal to the theoretical flow discharge. This discussion shows that the data (80 runs) used by [1] are not reliable and physically meaningful and the discharge equation developed by [1] is incorrect. This paper also shows that it is simply possible to develop a general theoretical discharge equation for a semi-elliptical or elliptical weir (as developed for circular weirs by other researchers) based on the principle of energy. Moreover, a preliminary dimensional analysis is conducted to identify the factors affecting the discharge coefficient. The integration of the proposed theoretical discharge equation with the dimensional analysis enables the future development of a validated discharge coefficient using new experimental data, which will provide engineers with a robust design tool.

本文讨论了Parsaie et al.(2025)[1]在自由流动条件下确定插入矩形明渠中的半椭圆尖顶堰流量方程的研究。用[1]推导了半椭圆堰的流量方程，并采用辛普森数值积分计算框架对堰的流量方程进行了分析。将[1]理论放电方程应用于收集的文献数据（80次运行），并将其结果与实测放电进行比较。对于所有收集到的数据，报告的理论流量小于实际流量，以[1]表示。理论流动放电是一种理想化的理论，它假设了匀速、零能量损失等理想条件，而这些条件在现实中是不可能实现的。在实际操作中，由于粘度等因素的影响，实际流量与理论流量存在偏差，导致流速分布不均匀，造成不可避免的能量损失。因此，实际流量总是小于或等于理论流量。这一讨论表明，[1]所使用的数据（80次运行）是不可靠的，没有物理意义，[1]所开发的放电方程是不正确的。本文还表明，根据能量原理，可以简单地推导出半椭圆或椭圆堰的一般理论流量方程（正如其他研究人员为圆形堰所开发的那样）。并对影响流量系数的因素进行了初步量纲分析。将提出的理论流量方程与量纲分析相结合，可以使用新的实验数据开发经过验证的流量系数，这将为工程师提供一个强大的设计工具。

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引用次数: 0

Cogging torque functional inversion theory-based optimization of circumferential stiffness in claw-pole magnetic levitation torque motors with auxiliary slots 基于齿槽转矩泛函反演理论的辅助槽爪极磁悬浮转矩电机周向刚度优化

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-11-01 DOI: 10.1016/j.flowmeasinst.2025.103111

Jiahui Huang, Zhankai Song, Shulin Xie, Sheng Li, Jian Ruan

This paper addresses the key technical challenges in the electromechanical conversion stage of two-dimensional valves by proposing a framework for the “cogging torque functional inversion theory.” Based on this theory, the claw-pole magnetic levitation torque motor with self-positioning capability has been successfully developed. The theory introduces a design principle of “actively enhancing specific harmonic resonance,” which maximizes stiffness by directionally amplifying the fundamental component of cogging torque. This transforms the cogging torque into restorative torque stiffness, providing the motor with positioning stiffness analogous to that of a mechanical spring. This approach converts the traditionally detrimental cogging torque into an effective torque with periodic positioning characteristics, achieving a paradigm shift from “passive suppression” to “active utilization."In terms of theoretical framework construction, this study systematically establishes the Cogging Torque Functional Inversion Theory. By precisely designing the pole-slot matching to forcibly satisfy the condition

n N_{r} = 2 m p

, the fundamental wave (m = 1,n = 1) resonance is maximized. This innovative design elevates the circumferential stiffness from 1.3 mNm/deg to 12.2 mNm/deg, laying a solid foundation for subsequent performance optimization. Regarding structural optimization, the study proposes an auxiliary slot magnetic field reconstruction method, which directionally enhances the amplitude and phase coupling effects of the 10n-th harmonic through magnetic conductance harmonic modulation. This design significantly increases the circumferential stiffness to 32 mNm/deg while maintaining the system's dynamic response characteristics. Three-dimensional finite element simulations and experimental validation consistently demonstrate that the auxiliary slot design not only improves the circumferential stiffness by 201.6 % but also enhances the frequency response bandwidth by 26 %–44 %, achieving synergistic optimization of static and dynamic characteristics. However, the performance optimization process also reveals typical trade-off characteristics: the auxiliary slot design reduces the mid-position electromagnetic torque by 7.3 % and decreases the output angular displacement by 12.2 %. This coupling effect of stiffness enhancement and torque/displacement attenuation fundamentally reflects the rebalancing of electromagnetic energy during spatial distribution reconstruction.

本文通过提出“齿槽转矩泛函反演理论”框架，解决了二维阀门机电转换阶段的关键技术挑战。在此基础上，成功研制了具有自定位能力的爪极式磁悬浮转矩电机。该理论引入了“主动增强比谐共振”的设计原则，通过定向放大齿槽扭矩的基本分量来最大化刚度。这将齿槽扭矩转化为恢复扭矩刚度，为电机提供类似于机械弹簧的定位刚度。该方法将传统的有害齿槽扭矩转化为具有周期性定位特性的有效扭矩，实现了从“被动抑制”到“主动利用”的范式转变。在理论框架构建方面，系统建立了齿槽转矩泛函反演理论。通过精确设计极槽匹配，强制满足nNr=2mp条件，使基波（m = 1,n = 1）共振最大化。这种创新设计将周向刚度从1.3 mNm/deg提高到12.2 mNm/deg，为后续的性能优化奠定了坚实的基础。在结构优化方面，本研究提出了一种辅助槽磁场重建方法，通过磁导谐波调制定向增强10n次谐波的幅相耦合效应。这种设计在保持系统动态响应特性的同时，将周向刚度显著提高到32毫微米/度。三维有限元仿真和实验验证一致表明，辅助槽设计不仅使周向刚度提高了201.6%，而且使频响带宽提高了26% ~ 44%，实现了静动态特性的协同优化。然而，性能优化过程也显示出典型的权衡特征：辅助槽设计使中间位置电磁转矩降低了7.3%，输出角位移降低了12.2%。这种刚度增强与扭矩/位移衰减的耦合效应从根本上反映了空间分布重构过程中电磁能量的再平衡。

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引用次数: 0

A hybrid BFM/CFD framework with modified kinetic energy carry-over coefficient for accurate leakage prediction in eccentric labyrinth seals 修正动能携带系数的BFM/CFD混合框架用于偏心迷宫密封泄漏的精确预测

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-11-01 DOI: 10.1016/j.flowmeasinst.2025.103117

Qianlei Gu , Wanfu Zhang , Mingjie Zhang , Hang Yin

While Computational Fluid Dynamics (CFD) is capable of predicting leakage in eccentric labyrinth seals, the computationally efficient Bulk-Flow Model (BFM) remains widely used in engineering design. However, its reliance on oversimplified assumptions for discharge and kinetic energy carry-over (KEC) coefficients leads to significant prediction discrepancies. In this study, a hybrid BFM/CFD framework is developed to enhance the fidelity of leakage prediction for eccentric labyrinth seals. Parametric CFD simulations are first conducted to quantify the effects of eccentricity ratio (ε) and pressure ratio (PR) on leakage flow rate, flow field distribution, discharge coefficient (μ₁ᵢ), and KEC coefficient (μ₂ᵢ). Results show that increasing ε enlarges the effective clearance, thereby reducing sealing effectiveness, while μ₁ᵢ is insensitive to ε but decreases with PR. In contrast, μ₂ᵢ grows with both ε and PR, exhibiting a quadratic correlation with the latter. Comparison against CFD results indicates that the classical BFM consistently underestimates μ₂ᵢ and axial velocity while slightly overpredicting cavity pressure. To address this limitation, a CFD-informed modification of μ₂ᵢ is introduced into the BFM. The improved model reduces the leakage prediction error from ∼18 % to within 7 % across a wide range of operating conditions. Validation against an independent seal geometry further demonstrates its robustness. This work provides a practical approach for integrating high-fidelity CFD insights into low-cost BFM, thereby offering improved predictive accuracy for eccentric labyrinth seals in advanced turbomachinery.

虽然计算流体力学（CFD）能够预测偏心迷宫密封的泄漏，但计算效率高的体积流模型（BFM）仍然广泛应用于工程设计中。然而，它依赖于对流量和动能携带（KEC）系数的过于简化的假设，导致了显著的预测差异。为了提高偏心迷宫式密封泄漏预测的保真度，本文建立了BFM/CFD混合预测框架。首先进行了参数化CFD模拟，量化了偏心比（ε）和压力比（PR）对泄漏流量、流场分布、流量系数（μ1≈）和KEC系数（μ2≈）的影响。结果表明，ε的增大增大了有效间隙，从而降低了密封效果，μ1′′对ε不敏感，但随PR的增大而减小，而μ2′′则随ε和PR的增大而增大，并与PR呈二次相关关系。与CFD计算结果的对比表明，经典的BFM模型始终低估μ2 l和轴向速度，而略微高估空腔压力。为了解决这一限制，在BFM中引入了一种通知cfd的μ2 - l修饰。改进的模型在广泛的操作条件下将泄漏预测误差从~ 18%降低到7%以内。针对独立密封几何形状的验证进一步证明了其稳健性。这项工作为将高保真CFD集成到低成本BFM中提供了一种实用的方法，从而提高了先进涡轮机械偏心迷宫密封的预测精度。

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引用次数: 0

Discharge measurement in small streams using current meters: An example using FlowTracker to assess the influence of vertical count and number of points per vertical 使用流速计测量小溪的流量：使用FlowTracker评估垂直计数和每个垂直点数的影响的示例

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-11-01 DOI: 10.1016/j.flowmeasinst.2025.103112

Martin Slavík, Kamila Tučanová, Miroslav Šobr

Stream discharge is a key hydrologic variable, essential for water management and hydrologic modelling. The widely used velocity-area method determines discharge by measuring flow velocity at several verticals across a stream and at different depths along each vertical. While traditional measurements used hydrometric propellers, modern practice often employs FlowTracker device. Its application is governed by ISO 748, whose latest revision (2021) increased the recommended number of verticals but does not specify the number of measurement points per vertical. This study investigates how (i) varying the number of verticals, based on the three most recent ISO 748 versions, and (ii) varying the number of measurement points per vertical, affects the FlowTracker discharge measurements. Measurements were taken repeatedly at seven lower-order stream profiles, and the resulting discharge values obtained for each profile using different number of verticals and/or points per vertical were then compared with each other. Based on over 500 values measured, the deviations in average velocities between measurements taken with one, two and three points per vertical proved to be insignificant. On the contrary, the difference between the recent standard (recommending the highest number of verticals) and its version from 1997 was significant, with the latter one consistently yielding higher discharges than the recent standard. The recent standard exhibited the lowest measurement uncertainties and deviations across all profiles, suggesting that its tightening in 2021 was appropriate. This study provides insight into the effective use of the velocity-area methods and can find practical relevance across various fields of water management.

河流流量是一个关键的水文变量，对水管理和水文建模至关重要。广泛使用的速度面积法是通过测量一条河流上几个垂直方向和每个垂直方向不同深度的流速来确定流量的。传统的测量方法使用流体测量螺旋桨，而现代的测量方法通常使用FlowTracker设备。其应用由ISO 748管理，其最新版本（2021年）增加了建议的垂直数量，但没有指定每个垂直的测量点数量。本研究研究了(i)基于三个最新的ISO 748版本，改变垂直井段的数量，以及（ii）改变每个垂直井段的测量点数量，是如何影响FlowTracker流量测量的。在7个低阶流剖面上重复进行测量，然后对每个剖面使用不同数量的垂直和/或垂直点获得的流量值进行相互比较。根据500多个测量值，每垂直方向1点、2点和3点测量的平均速度之间的偏差证明是微不足道的。相反，最近的标准（建议最高垂直数量）与1997年的版本之间的差异是显著的，后者的排放量始终高于最近的标准。最近的标准在所有剖面中显示出最低的测量不确定性和偏差，这表明2021年的收紧是合适的。本研究提供了对有效使用速度面积方法的见解，并可以在水管理的各个领域找到实际的相关性。

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引用次数: 0

Research on gas components detection and measurement method of carbon dioxide concentration based on ultrasonic 基于超声波的气体成分检测及二氧化碳浓度测量方法研究

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-10-31 DOI: 10.1016/j.flowmeasinst.2025.103106

Siqin Hou , Mingyang Sun , Jiao Li , Guoqing Shen

The acquisition of accurate and reliable carbon dioxide emission data is crucial for achieving energy-saving and emission reduction targets in the electricity industry. To accurately determine the gas composition during boiler operation and enable real-time monitoring of the carbon dioxide concentration, acoustic gas sensing technology has been adopted. An experimental system based on ultrasonic was developed for detecting multiple gaseous mixtures, and the effects of molecular structure, gas composition, and temperature on acoustic parameters were investigated. The results demonstrate that when determining the components of pure gases and binary gas mixtures using acoustic velocity or the acoustic attenuation coefficient, the average relative error is approximately 0.03 %. For multicomponent gas mixtures, the proposed method based on the contour intersection of the acoustic velocity and acoustic attenuation coefficient can accurately determine the gas concentration. The system successfully achieved dynamic tracking and quantitative analysis of carbon dioxide at volume concentrations of 5–15 % during boiler operation according to acoustic attenuation coefficient.

准确可靠的二氧化碳排放数据的获取是实现电力行业节能减排目标的关键。为了准确测定锅炉运行过程中的气体成分，实现对二氧化碳浓度的实时监测，采用了声波气体传感技术。建立了一种基于超声的多气体混合物检测实验系统，研究了分子结构、气体组成和温度对声学参数的影响。结果表明，用声速或声衰减系数测定纯气体和二元气体混合物组分时，平均相对误差约为0.03%。对于多组分混合气体，本文提出的基于声速与声衰减系数的轮廓相交的方法可以准确地确定气体浓度。该系统根据声衰减系数成功地实现了锅炉运行过程中体积浓度为5 ~ 15%的二氧化碳的动态跟踪和定量分析。

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引用次数: 0

LED illumination for planar PIV in large-scale hydraulic laboratories 大型液压实验室平面PIV的LED照明

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-10-31 DOI: 10.1016/j.flowmeasinst.2025.103093

Wout Bakker , Anton de Fockert , Helena I.S. Nogueira , Gosse Oldenziel

This paper presents the application, and implications of line arrays of light emitting diodes (LEDs) as an illumination source for planar particle image velocimetry (PIV) measurements in large-scale hydraulic laboratories. The use of class 4 lasers, commonly applied as illumination source in these PIV measurements, requires strict safety precautions (i.e. to prevent safety hazards for people working in their vicinity), specifically when applied at hydraulic experimental setups that are not located in a laser lab. To examine the applicability of an alternative light source, differences between LED- and laser-based illumination for PIV are analyzed. A theoretical analysis, in which a so-called motion blur parameter (

β_{m b}

) is introduced, shows that for moderate flow velocities in large-scale setups, image blur can be avoided, even for relatively long (millisecond) pulse widths. The light sheet thickness, width and intensity of a pulsed laser and a line array of both continuous and pulsed LEDs are measured and compared. Based on these properties a safety assessment is made, from which it is concluded that the application of arrays of LEDs for PIV measurements applied in liquid flows requires significantly less safety precautions than in case a class 4 PIV laser is used. Planar (2D) PIV measurements have been performed with both a pulsed and a continuous LED as light source for two testcases in large hydraulic scale-models. Time-averaged velocity field results from the LED-based PIV measurements show good resemblance to both PIV measurements obtained with a class 4 laser as well as to pitot tube measurements. It is shown that the time-averaged PIV vector fields are influenced by motion blur, resulting in a distinct bias towards smaller velocities when increasing motion blur. The two testcases show that linear LED arrays can serve as a suitable alternative illumination source for planar PIV measurements in large-scale hydraulic laboratories in case motion blur remains limited. Specifically, LED line arrays are considered useful for the time-average quantification of predominantly 2D, low to moderate flows in a relatively large domain.

本文介绍了发光二极管（led）线阵列作为照明光源在大型水工实验室平面粒子成像测速（PIV）测量中的应用及其意义。在这些PIV测量中，通常用作照明源的4级激光器的使用需要严格的安全预防措施（即防止在其附近工作的人员的安全危害），特别是在不位于激光实验室的液压实验装置中应用时。为了检验替代光源的适用性，分析了基于LED和激光的PIV照明之间的差异。一个理论分析，其中所谓的运动模糊参数（βmb）的引入，表明在大规模设置中等流速，图像模糊是可以避免的，即使是相对较长的（毫秒）脉冲宽度。测量和比较了脉冲激光器和连续和脉冲led线阵列的光片厚度、宽度和强度。基于这些特性进行了安全评估，得出的结论是，与使用4级PIV激光器相比，在液体流动中应用led阵列进行PIV测量所需的安全措施要少得多。平面（2D） PIV测量采用脉冲和连续LED作为光源，在大型水力模型中进行了两个测试案例。基于led的PIV测量的时间平均速度场结果与使用4级激光获得的PIV测量结果以及皮托管测量结果具有良好的相似性。结果表明，时间平均PIV矢量场受到运动模糊的影响，当运动模糊增加时，PIV矢量场明显偏向较小的速度。这两个测试案例表明，在运动模糊仍然有限的情况下，线性LED阵列可以作为大型水力实验室平面PIV测量的合适替代照明光源。具体来说，LED线阵列被认为是有用的时间平均量化主要是二维，低到中等流量在一个相对较大的领域。

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引用次数: 0

Experimental investigation of unsteady flow dynamics in therminol-66 using edge tone-induced oscillations 基于边缘音调振荡的热米诺-66非定常流动动力学实验研究

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation

Pub Date : 2025-10-31 DOI: 10.1016/j.flowmeasinst.2025.103114

Silvino A. Balderrama Prieto , Jason Palmer , Richard N. Christensen

Recent research has demonstrated that flow oscillations induced by a wedge positioned opposite the jet outlet in edge tones can be effectively utilized for flow measurement purposes. This highlights the necessity for developing advanced instrumentation capable of precise flow measurements in experimental setups exposed to radiation and in challenging fluids such as molten salts.

This study contributes to the existing body of knowledge by conducting experiments using Therminol-66, an effective surrogate for FLiBe under appropriate temperature conditions for nuclear applications, across a broad range of Reynolds numbers from 17,700 to 555,000. Experiments were conducted with Therminol-66 at approximately 368.8 K under atmospheric pressure, with varying flow rates. A reliable correlation was established between the generated frequencies, corresponding flow rates, and device geometry parameters. The data were subjected to non-dimensional analysis to reveal the interrelationships among flow rate, fluid properties, device geometry, and their impact on the acoustic tones produced by the edge tone device. These findings contribute to the development of precise flow measurement instrumentation for use in challenging environments.

最近的研究表明，在射流出口对面的边缘位置放置楔形物所引起的流动振荡可以有效地用于流量测量。这突出了开发能够在暴露于辐射的实验装置和具有挑战性的流体（如熔盐）中进行精确流量测量的先进仪器的必要性。本研究利用Therminol-66 （FLiBe的有效替代品，适用于核应用的适当温度条件下）在17,700至555,000的广泛雷诺数范围内进行实验，为现有的知识体系做出贡献。实验用Therminol-66在大约368.8 K的常压下，以不同的流速进行。在产生的频率、相应的流量和器件几何参数之间建立了可靠的相关性。对数据进行了无量纲分析，揭示了流量、流体性质、装置几何形状之间的相互关系，以及它们对边音装置产生的声学音调的影响。这些发现有助于开发在具有挑战性的环境中使用的精确流量测量仪器。

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引用次数: 0