International Journal of Heat and Fluid Flow最新文献_第8页

Increasing bushing temperature via a heating tube for performance enhancement of ion implanters 通过加热管提高套管温度以提高离子注入器的性能

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-24 DOI: 10.1016/j.ijheatfluidflow.2025.110214

Yoon Hoo Shin , Hyo Jun Sim , Jong Jin Hwang , Seung Jae Moon

This study aims to enhance the performance of an ion implanter by improving temperature control through a heating tube integrated within the bushing. In an ion implanter, gases such as PH₃, AsH₃, BF₃, and GeF₄ are ionized by applying high voltages of up to 80 kV. Consequently, an ion beam is extracted from the electrode. However, residual gases are deposited inside the bushing under relatively low operating temperatures. Consequently, a leakage current flows through the bushing due to the deposited residual gas layer. This results in arcing from the potential differences across the bushing. To address this issue, this study designs and implements a heating tube within the bushing and circulates a heating fluid via the tube to increase the bushing’s temperature. The proposed heating system prevents gas deposition and enhances the efficiency of the deposition process. The optimal condition—defined as achieving a bushing wall temperature of 60°C with minimal energy input—was determined as a FC-3283 flow rate of 24 LPM with an inlet temperature of 100°C. The effectiveness of this solution is evaluated through a combination of experiments and computational fluid dynamics simulations. The experimental results corroborate the simulation outcomes. This integrated experimental–simulation approach is expected to significantly enhance deposition process efficiency. These findings offer valuable insights for optimizing ion implantation performance and reducing the frequency of bushing replacements.

本研究旨在通过集成在套管内的加热管改善温度控制来提高离子注入器的性能。在离子注入器中，通过施加高达80kv的高压使PH3、AsH3、BF3和GeF4等气体电离。因此，从电极中提取出离子束。然而，在相对较低的工作温度下，残余气体沉积在衬套内。因此，由于沉积的残余气体层，泄漏电流流过套管。这导致电弧从电位差横跨衬套。为了解决这一问题，本研究在套管内设计并实现了一个加热管，并通过加热管循环加热流体来提高套管的温度。所提出的加热系统可以防止气体沉积，提高沉积过程的效率。最优条件为FC-3283的流量为24 LPM，进口温度为100℃，以最小的能量输入实现60℃的衬套壁温度。通过实验和计算流体力学模拟相结合的方法对该方法的有效性进行了评价。实验结果与仿真结果相吻合。这种集成的实验模拟方法有望显著提高沉积过程的效率。这些发现为优化植入性能和减少套管更换频率提供了有价值的见解。

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引用次数: 0

Effects of various cylindrical hole layouts on film cooling effectiveness of a cavity blade tip 不同圆柱孔布置对空腔叶尖气膜冷却效果的影响

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-17 DOI: 10.1016/j.ijheatfluidflow.2025.110211

Kun Du , Fangshun Zhang , Ding Luo , Wenbin Chen , Cunliang Liu , Bengt Sunden

Turbine blade tip clearance exacerbates aerodynamic losses and raises thermal load on the blade tip, detrimentally affecting blade lifespan and reliability. Arranging the film hole is a prevalent approach for blade tip cooling. A rational hole layout is crucial for improving the film cooling effectiveness and minimizing losses. Based on the conventional nine-hole tip layout along the camber line, this study presents a design concept involving moving one, two, or three film holes from the trailing edge region to the leading edge and adjusting the mid-chord holes downward. Five novel film hole layouts are given rise to by this concept. Numerical simulations are carried out to analyze the film cooling effectiveness and the streamline distribution on different film hole layouts. The results show that moving the trailing edge holes forward can enhance coolant flow on the leading edge and on the suction side. As more trailing edge holes are relocated forward, overall film cooling effectiveness is improved. Specifically, the layout with three trailing edge holes relocated to the leading edge has an 11.47% higher area-average film cooling effectiveness than the nine-hole tip layout along the camber line. The layout with three mid-chord holes shifted downward, with a 2.83% increase, enhances the cooling of the suction side on the mid-chord region and overall cooling uniformity. The structure that integrates both methods described above shows a 14.49% increase over the nine-hole tip layout along the camber line. In addition, changes in the positions of the film holes on the blade tip surface will also affect the aerodynamic losses. These findings provide valuable guidance for designing high-efficiency cooling tip structure.

涡轮叶片叶尖间隙加剧了气动损失，增加了叶尖上的热负荷，对叶片的寿命和可靠性产生不利影响。布置膜孔是一种常用的叶尖冷却方法。合理的孔布局是提高气膜冷却效果和减少损失的关键。在传统的九孔叶顶沿弧度线布置的基础上，本研究提出了一种设计理念，将一个、两个或三个膜孔从后缘区域移动到前缘，并将中弦孔向下调整。这一概念产生了五种新颖的膜孔布局。通过数值模拟分析了不同膜孔布置下的膜冷却效果和流线分布。结果表明，将尾缘孔向前移动可以增强前缘和吸力侧冷却剂的流动。随着更多尾缘孔向前移动，整体气膜冷却效果得到提高。具体而言，将3个尾缘孔重新布置到前缘的布置比沿弧度线布置的9个孔布置的面积平均气膜冷却效率高11.47%。三个中弦孔下移的布置增强了中弦区吸力侧的冷却效果，整体冷却均匀性提高了2.83%。结合上述两种方法的结构比沿弧度线的九孔尖端布局增加了14.49%。此外，叶尖表面膜孔位置的变化也会影响气动损失。这些研究结果为设计高效的冷却尖端结构提供了有价值的指导。

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引用次数: 0

Flow regime identification in a dual impeller gas-liquid stirred tank reactor using time-series analysis of radioactive particle tracking data 利用放射性粒子跟踪数据的时间序列分析识别双叶轮气液搅拌槽式反应器的流态

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.ijheatfluidflow.2025.110167

Roushni Kumari , Raghvendra Gupta , Jayashree Biswal , Miryan C. Cassanello , Rajesh Kumar Upadhyay

Accurate characterization of flow regimes in gas–liquid stirred tank reactors (STRs) is critical for the design, scale-up, and optimization of multiphase mixing systems. This study investigates three-dimensional liquid flow fields in a lab-scale dual impeller gas–liquid STR (T = 0.19 m), equipped with radial and mixed flow impellers. A non-invasive Radioactive Particle Tracking (RPT) technique was used to capture detailed flow behavior under varying operating conditions. Velocity vector plots, mean liquid velocity, and turbulent kinetic energy (TKE) profiles were analyzed to evaluate the hydrodynamic influence of impeller configuration and impeller spacing. To further understand the chaotic nature of the flow, time-series data from the tracked particle were processed, using Kolmogorov entropy, following the approach of Nedeltchev et al. (2003) for bubble columns. This entropy-based method enabled identification of flow regimes across different impeller speeds and superficial gas velocities, and impeller-to-impeller spacing to impeller diameter ratio (S/D). Additionally, the individual contributions of the lower and upper impellers to local Kolmogorov entropy were assessed, revealing their distinct roles in flow and bubble dispersion. The integration of RPT measurements with Kolmogorov entropy analysis provides a robust framework for understanding complex flow patterns and enhancing hydrodynamic design in dual impeller STRs.

准确表征气液搅拌槽式反应器（STRs）的流动状态对于多相混合系统的设计、放大和优化至关重要。本文研究了一个实验室规模的双叶轮气液STR （T = 0.19 m）的三维液体流场，该STR配备径向和混合流叶轮。一种非侵入性放射性粒子跟踪（RPT）技术用于捕获不同操作条件下的详细流动行为。通过对速度矢量图、平均液体速度和湍流动能（TKE）分布曲线的分析，评估了叶轮构型和叶轮间距对流体动力的影响。为了进一步了解流动的混沌性质，利用Kolmogorov熵，按照Nedeltchev等人（2003）对气泡柱的方法，对来自跟踪粒子的时间序列数据进行处理。这种基于熵的方法可以识别不同叶轮转速和表面气体速度下的流动状态，以及叶轮与叶轮之间的间距与叶轮直径比（S/D）。此外，还评估了上下叶轮对局部Kolmogorov熵的贡献，揭示了它们在流动和气泡分散中的不同作用。RPT测量与Kolmogorov熵分析的集成为理解复杂的流动模式和加强双叶轮str的流体动力设计提供了一个强大的框架。

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引用次数: 0

Inviscid characteristics of a conical shock wave from a finite cone impinging on a flat plate in a Mach 2 flow 2马赫流动中有限锥撞击平板产生的锥形激波的无粘特性

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-04 DOI: 10.1016/j.ijheatfluidflow.2025.110158

Bikalpa Bomjan Gurung, Sudhir L. Gai, Amna Khraibut, Krishna M. Talluru

Comparison of the inviscid simulation and experiment data (Gai & Teh, 2000) showed the strong viscous effect of the boundary layer on the plate with separation of the boundary layer. There was a linear relationship between the inviscid and experimental data of wall pressures (

P_{3, m a x} / P_{1}

) measured on the symmetry plane. The effect of the interaction between the impinging shock and the trailing edge expansion fan originating from the base of the cone was to reduce the conical shock angle beginning at the expansion head. The expansion fan interaction showed strong dependency on the cone height from the plane. Separation length obtained from the experiment showed a power law dependency on

P_{3, m a x} / P_{1}

for all cone angles and cone heights from the surface when normalised by the boundary layer plate thickness at the impingement location.

无粘模拟与实验数据的对比（Gai & Teh, 2000）表明，边界层在分离的情况下对板产生了很强的粘滞效应。在对称面上测得的壁面压力（P3,max/P1）的无粘值与实验值呈线性关系。冲击激波与尾缘膨胀风扇的相互作用减小了从膨胀头开始的锥形激波角。膨胀风扇的相互作用与锥距平面高度密切相关。实验得到的分离长度与P3、max/P1呈幂律关系，所有锥角和锥距表面的高度均由撞击位置的附面层板厚度归一化。

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引用次数: 0

Experimental and numerical investigation of fast control surface deflections 快速控制曲面挠度的实验与数值研究

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.ijheatfluidflow.2025.110177

Ruben B. Seidler , Reinhard Geisler , Andreas Schröder , Jochen Wild

The development of load alleviation for an aircraft requires an accurate and efficient prediction of gust and maneuver loads. In the design of an aircraft the prediction of these unsteady loads has become crucial for the ideal alleviation of gust loads. A database for unsteady aerodynamic responses is however very cost expensive and time consuming to generate, in an experiment and with numerical simulations. An efficient tool for the computation of aerodynamic responses is the linear frequency domain solver, which allows the prediction of amplitude and phase shift of any periodic oscillation of body or flow in the frequency domain. The unsteady response allows a fast and efficient prediction for any arbitrary unsteady change of in example a control surface deflection or a gust speed. The validation of the linear frequency domain solver for unsteady aerodynamics is crucial, so that its prediction quality is ensured. A wind tunnel experiment was set up, which focused on fast control surface deflections and analyzed the capabilities and accuracy of the method. The experiment was accompanied by two- and three-dimensional URANS simulations, which allow a more detailed comparison and help to increase the understanding of the flow physics. For higher frequencies of the control surface oscillation, the adjusting position of the stagnation point on the leading edge lags behind the actual control surface position as if it were in a quasi-steady state. This leads to a phase lag between motion and resulting force and a lower lift response amplitude.

飞机减载的发展需要对阵风和机动载荷进行准确有效的预测。在飞机设计中，对这些非定常载荷的预测对于理想地减轻阵风载荷至关重要。然而，在实验和数值模拟中，非定常气动响应数据库的生成是非常昂贵和耗时的。线性频域求解器是计算气动响应的有效工具，它可以在频域内预测物体或流动的任何周期振荡的幅值和相移。非定常响应允许对任意非定常变化进行快速有效的预测，例如控制面偏转或阵风速度。非定常空气动力学线性频域解算器的验证是保证其预测质量的关键。以快速控制曲面偏转为研究对象，建立了风洞实验，分析了该方法的性能和精度。该实验同时进行了二维和三维URANS模拟，可以进行更详细的比较，并有助于增加对流动物理的理解。当控制面振荡频率较高时，前缘驻点的调节位置滞后于实际控制面位置，仿佛处于准稳态。这导致运动和产生的力之间的相位滞后和较低的升力响应幅度。

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引用次数: 0

Influence of turbulence inflow conditions on aeroacoustics of wall-bounded flows 湍流入流条件对壁面流动气动声学的影响

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-26 DOI: 10.1016/j.ijheatfluidflow.2025.110216

Ronith Stanly , Eman Bagheri , Timofey Mukha , Philipp Schlatter

A scale-resolving simulation of a turbulent boundary layer (TBL) requires an inflow condition that introduces turbulence into the domain. The boundary values must accurately approximate real turbulent structures in order to minimize the inflow adaption and to allow for sustained growth of the TBL. In practice, all inflow conditions incur an error on the flow field directly downstream. This error is typically quantified as the distance from the inlet at which the velocity statistics recover correct values. However, this measure is insufficient for simulations where evaluating acoustic pressure is an important outcome, necessitating a quantification of the error in the pressure field. This aspect of inflow generation is currently not addressed in the literature and constitutes the main topic of this article. We show that violation of the continuity equation near the inflow region generates spurious pressure fluctuations over the entire domain, leading to poor sound prediction results in low Mach number regimes. In particular, we look at three known inflow generation methods (namely, precursor simulations, the synthetic eddy method, and recycling using an upstream open channel flow) and evaluate how silent they are. For evaluation, the sensitive case of a TBL developing over a flat plate is used as the test case. The recycling method satisfies the divergence-free condition and introduces the least amount of spurious numerical noise to the sound field while giving reasonably good agreement in terms of the overall development of the TBL.

湍流边界层（TBL）的尺度解析模拟需要引入湍流进入区域的入流条件。边界值必须精确地近似真实的湍流结构，以便最小化流入适应并允许TBL的持续增长。实际上，所有入流条件都会对下游流场产生误差。这个误差通常被量化为从入口到速度统计恢复正确值的距离。然而，这种方法在模拟中是不够的，因为评估声压是一个重要的结果，需要对压力场的误差进行量化。流入产生的这一方面目前尚未在文献中得到解决，并构成本文的主要主题。我们表明，在流入区域附近的连续性方程的破坏会在整个区域产生虚假的压力波动，导致低马赫数区域的声音预测结果不佳。特别地，我们研究了三种已知的流入生成方法（即前体模拟、合成涡流法和利用上游明渠流的回收），并评估了它们的沉默程度。为了评估，TBL在平板上发展的敏感情况被用作测试用例。该方法满足无散度条件，对声场引入了最少的伪数值噪声，同时在TBL的整体发展方面给出了相当好的一致性。

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引用次数: 0

CFD investigation of thermal management and flow behavior in an optimized air-cooled tail rotor propulsion system 优化风冷尾桨推进系统的热管理与流动特性CFD研究

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-14 DOI: 10.1016/j.ijheatfluidflow.2025.110202

Hyowon Bang , Huichan Lee , Giyoung Park , Sungjae Kim , Seangwock Lee

As aerospace propulsion steadily transitions toward electrification, effectively dissipating heat in compact electric tail rotor motors has become a pressing design challenge. In this study, a high-fidelity computational fluid dynamics (CFD) framework is employed to investigate an air-cooled propulsion system specifically configured for helicopter tail rotor applications. Three passive geometric modifications are examined in detail: widening of lateral duct openings, introducing a 15° inclination to the duct sidewalls, and incorporating rotating blades along the central shaft. The optimized configuration demonstrated substantial thermal gains, reducing peak temperatures by 10.38% in the winding, 8.23% in the magnet, and 19.0% in the shaft. This enhancement was primarily attributed to enhanced airflow penetration, boundary-layer thinning, and the development of favorable secondary recirculation zones. Convective heat transfer performance was also elevated, with Nusselt numbers increasing by up to 11.6% across key components. Importantly, these thermal benefits were achieved while maintaining aerodynamic integrity, as the simulated thrust deviated by only 1.34% from experimental rig measurements. The results highlight how targeted, flow-physics-based passive design strategies can simultaneously improve cooling performance and preserve propulsion efficiency. This approach offers a scalable and integration-friendly pathway for next-generation electric rotorcraft requiring lightweight, thermally resilient tail rotor systems.

随着航空航天推进向电气化的稳步过渡，在紧凑型电动尾桨电机中有效散热已成为一个紧迫的设计挑战。在本研究中，采用高保真计算流体动力学（CFD）框架对直升机尾桨专用的气冷推进系统进行了研究。详细检查了三种被动几何修改：拓宽侧管道开口，向管道侧壁引入15°倾角，并沿中央轴合并旋转叶片。优化后的结构显示出显著的热增益，绕组的峰值温度降低了10.38%，磁体的峰值温度降低了8.23%，轴的峰值温度降低了19.0%。这种增强主要是由于气流穿透增强、边界层变薄以及有利的二次再循环区发展。对流换热性能也得到了提升，关键部件的努塞尔数增加了11.6%。重要的是，在保持气动完整性的同时，获得了这些热效益，因为模拟推力与实验装置测量值的偏差仅为1.34%。研究结果强调了有针对性的、基于流动物理的被动设计策略如何在提高冷却性能的同时保持推进效率。这种方法为需要轻型、热弹性尾桨系统的下一代电动旋翼飞机提供了一种可扩展且易于集成的途径。

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引用次数: 0

Comparative study on heat extraction performance and economic feasibility between medium-deep coaxial and U-type ground heat exchangers 中深同轴与u型地热交换器排热性能及经济可行性对比研究

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-06 DOI: 10.1016/j.ijheatfluidflow.2025.110170

Pengtao Wang , Rui Liang , Shimin Wang , Junyu Feng , Jie Zhang , Shengshan Bi

This study utilizes a geothermal heating project located in Xi’an as a case study, developing full-scale numerical models for medium-deep coaxial borehole heat exchangers (DCBHE) and medium-deep U-type borehole heat exchangers (DUBHE) at equivalent depths. Through extensive heat transfer simulations conducted over five cycles, the research provides a comprehensive comparison of the heat extraction efficiency and economic viability of the two types of ground heat exchangers. This comparison employs a ratio method that accounts for pump energy losses, the levelized cost of heat (LCOH), and net present value (NPV) metrics. The findings indicate that the heat exchange per unit length for DCBHE and DUBHE ranges from 123.1 to 149.5 W/m and 93.9 to 170.71 W/m, respectively, with a critical flow rate of 7.21 kg/s. When incorporating pump power consumption, the critical flow rate is determined to be 6.62 kg/s, which corresponds to a comprehensive heat exchange per unit length of 127.7 W/m. Beyond this flow rate, the comprehensive heat transfer performance of DUBHE surpasses that of DCBHE. Therefore, this study divides the heat extraction zones into low-flow zones and high-flow zones based on the critical flow rate of 6.62 kg/s, providing a qualitative identification basis for selecting appropriate flow rate conditions for different types of heat exchangers. The economic analysis reveals that at the critical flow rate, the cost per unit of heat extraction for DCBHE exceeds that of DUBHE, and as the heat extraction duration increases, the NPV of DUBHE becomes more favorable compared to DCBHE. Consequently, DUBHE is determined to be more economically viable than DCBHE.

本研究以西安某地热供热项目为例，建立了等效深度的中深同轴井眼热交换器（DCBHE）和中深u型井眼热交换器（DUBHE）全尺寸数值模型。通过对5个循环进行的广泛的传热模拟，研究提供了两种类型的地面热交换器的热提取效率和经济可行性的综合比较。这种比较采用了一种比率法，该方法考虑了泵的能量损失、热量平准化成本（LCOH）和净现值（NPV）指标。结果表明：DCBHE和DUBHE的单位长度换热范围分别为123.1 ~ 149.5 W/m和93.9 ~ 170.71 W/m，临界流量为7.21 kg/s；考虑泵功率消耗，确定临界流量为6.62 kg/s，单位长度综合换热127.7 W/m。在此流量之外，DUBHE的综合换热性能优于DCBHE。因此，本研究以6.62 kg/s的临界流量为基础，将抽热区划分为低流量区和高流量区，为不同类型换热器选择合适的流量条件提供定性识别依据。经济分析表明，在临界流量下，DCBHE的单位抽热成本高于DUBHE，且随着抽热时间的增加，DUBHE的净现值优于DCBHE。因此，DUBHE在经济上比DCBHE更可行。

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引用次数: 0

Thermal-hydraulic and structural analysis of a liquid-cooled heat sink with rotating twisted tape inserts 带旋转扭带插片的液冷散热器的热水力和结构分析

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-29 DOI: 10.1016/j.ijheatfluidflow.2025.110225

Abdullah Masoud Ali , Mohammad Ismail , Aldo Rona , Audrius Bagdanavicius , Areej Masoud Ali

This study investigates advanced thermal management techniques for liquid-cooled electronics, aiming to enhance cooling efficiency through innovative rotating twisted tape inserts in the heat sink. A water-cooled heat sink is analysed at an inlet temperature of 300 K, with Reynolds numbers ranging from 100 to 400, and a heat flux of 180,000 W/m². Five configurations are examined: a base case, a stationary twisted tape (ω = 0 rpm), and rotating twisted tapes at 300, 600, and 900 rpm. Results show that both stationary and rotating twisted tapes significantly reduce the base plate temperature compared to the base case. At Re = 400, temperature drops of 10.73 K, 13.12 K, 15.36 K, and 16.24 K are observed with ω = 0, 300, 600, and 900 rpm, respectively, demonstrating improved thermal performance that can enhance the reliability and lifespan of cooled electronics. While stationary tapes increase the friction factor due to intensified fluid-wall interactions, rotating tapes decrease the axial pressure drop by increasing fluid momentum. Fluid-structure interaction analysis indicates minimal deformation in copper and aluminium tapes, with maximum displacement occurring axially. Aluminium shows slightly higher deformation (2.850 × 10⁻⁵ mm) than copper (1.605 × 10⁻⁵ mm). These findings offer valuable insights for optimising thermal–hydraulic performance and structural integrity in electronic cooling systems.

本研究探讨了液冷电子产品的先进热管理技术，旨在通过在散热器中创新的旋转扭曲带插入来提高冷却效率。对进口温度为300 K、雷诺数为100 ~ 400、热流密度为180,000 W/m2的水冷式散热器进行了分析。测试了五种配置：基本情况，固定扭曲磁带（ω = 0 rpm）和旋转扭曲磁带（300,600和900 rpm）。结果表明，与基壳相比，固定和旋转扭带均能显著降低基板温度。在Re = 400时，当ω = 0,300, 600和900 rpm时，分别观察到温度下降10.73 K, 13.12 K， 15.36 K和16.24 K，这表明改进的热性能可以提高冷却电子设备的可靠性和寿命。固定带由于流体与壁面的相互作用加剧而增加了摩擦系数，而旋转带通过增加流体动量来减小轴向压降。流固耦合分析表明，铜和铝带的变形最小，轴向位移最大。铝的变形量（2.850 × 10−5mm）略高于铜（1.605 × 10−5mm）。这些发现为优化电子冷却系统的热工性能和结构完整性提供了有价值的见解。

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引用次数: 0

Theoretical study on leakage characteristics of an oil-injected single screw CO2 compressor 喷油单螺杆CO2压缩机泄漏特性的理论研究

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow

Pub Date : 2026-03-01 Epub Date: 2025-12-31 DOI: 10.1016/j.ijheatfluidflow.2025.110230

Qingchun Zhang , Junling Yang , Yanan Li , Zhentao Zhang , Hualin Yang , Yanchang Song , Yan He

Single Screw CO₂ Compressor (SSCC) is an essential component for utilizing CO₂ as working fluid. The miscibility of lubricating oil and CO₂ makes it more complicated to determine leaks in compressors. To investigate the leakage characteristics of the SSCC, a mathematical model for its operating process is developed. This model integrates an oil and gas two-phase leakage model, which considers the solubility of oil and CO₂. The study examined SSCC leakage and performance across varying clearances, speeds, and suction/discharge pressures. Results show that, under constant operating conditions, only indirect leakage of CO₂ dissolved in the oil occurs at smaller clearances. However, as the clearance increases, direct leakage of CO₂ is observed. An increase in clearance results in greater leakage and a decrease in volume and adiabatic efficiency. In addition, the effect of the fitting clearance on leakage is significantly more pronounced than meshing clearance. At the same speed, an increase in the suction pressure or a decrease in the discharge pressure increases the compressor’s volumetric efficiency. As the suction or discharge pressure increases, the adiabatic efficiency first increases and subsequently decreases. The optimum suction and discharge pressures for achieving maximum adiabatic efficiency at varied rotational speeds differ.

单螺杆CO2压缩机（SSCC）是利用CO2作为工作流体的重要部件。润滑油和二氧化碳的混溶性使得确定压缩机的泄漏变得更加复杂。为了研究SSCC的泄漏特性，建立了SSCC运行过程的数学模型。该模型集成了油气两相泄漏模型，考虑了油和CO2的溶解度。该研究测试了SSCC在不同间隙、速度和吸入/排出压力下的泄漏和性能。结果表明，在一定的运行条件下，在较小的间隙下，溶解在油中的CO2只发生间接泄漏。然而，随着间隙的增加，观察到二氧化碳的直接泄漏。间隙的增加导致更大的泄漏和体积和绝热效率的降低。此外，配合间隙对泄漏的影响明显比啮合间隙更明显。在相同的速度下，增加吸入压力或降低排出压力会增加压缩机的容积效率。随着吸、排气压力的增大，绝热效率先增大后减小。在不同转速下达到最大绝热效率的最佳吸入和排出压力是不同的。

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引用次数: 0