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Numerical Study of the Air Outlet Effect Inside a Living Room Connected to an Aerovoltaic Solar Air Heater 与光伏太阳能空气加热器相连的起居室内出风口效应的数值研究
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.95120
Slah Driss, Ridha Boudhiaf, Aram Hmid, Ismail Baklouti, Abederrahmane Aissa, Imen Kallel kammoun, Mohameds Salah Abid
In Sfax–Tunisia, Fossil fuels such as coal, fuel oil and natural gas, are the principle elements responsible for heating of buildings. The problem of pollution result is from the blazing of these fossil fuels and the dramatic increasing in the price of electricity. Thus aerovoltaic solar air heater (ASAH) appears to be a suitable and inexpensive technique for supplying hot air to heat buildings in the sunny area. The idea behind this paper is to employ the ASAH to improve the indoor air quality and thermal comfort by connecting the room and the panel through the use of a pipe. The objective of this work is to develop the design of ASAH and to study numerically the aerodynamic and thermal structures during the heating of a living room connected to an ASAH by means of ANSYS Fluent 17.0.Numerical simulation, implementing a RNG k-ɛ turbulence model, shows that this technique has a positive effect to improve the thermal comfort in a living room. Thus, it is suggested to employ an ASAH to heat buildings.
在突尼斯斯法克斯,煤炭、燃油和天然气等化石燃料是建筑物供暖的主要燃料。这些化石燃料的燃烧和电价的大幅上涨造成了污染问题。因此,光伏太阳能空气加热器(ASAH)似乎是为阳光充足地区的建筑物供暖提供热空气的一种合适而廉价的技术。本文背后的想法是利用 ASAH,通过管道连接房间和太阳能电池板,改善室内空气质量和热舒适度。这项工作的目的是开发 ASAH 的设计,并通过 ANSYS Fluent 17.0 对与 ASAH 相连的起居室加热过程中的空气动力和热结构进行数值研究。因此,建议采用 ASAH 为建筑物供暖。
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引用次数: 0
Numerical Analysis of the Co-firing Combustion of Coal and Palm Shell Kernel In Stoker Boiler 炉膛锅炉中煤炭和棕榈壳仁共燃的数值分析
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.163175
M. S. K. Tony Suryo Utomo, Muchammad, Eflita Yohana, Habib Indra Karim
The United Nations Framework Convention on Climate Change (UNFCCC) states that Indonesia is committed to contributing to global climate change solutions. The government will also continue to encourage the development of a number of renewable energy (EBT)-based power generation projects. This is based on the use of renewable energy which is still low, namely around (1.9%) 8215.5 MW. Meanwhile, the potential for EBT to become energy can be around 443,208 MW. One source of EBT in Indonesia that can be utilized is Biomass. Co-firing of biomass is a relatively cheaper option and does not require investment in new power plants. However, Co-firing combustion has several aspects that need to be studied, such as temperature combustion and the generation of gas emissions. Therefore, this study aims to determine the temperature and the emissions resulting from co-firing of palm kernel shell biomass. This research was conducted using the Computational Fluid Dynamics method on stoker boiler model. The test parameters of the research was the maximum and average temperatures in the furnace, and the average and maximum fractions of CO2, SO2 in the stoker boiler furnace. From the research conducted, it was found that the resulting combustion temperature decreased as the co-firing fraction of the biomass increased. However, CO2 gas emissions increased and SO2 decreased with increasing fraction of co-firing biomass which showed a decrease in harmful gas emissions and complete combustion that occurred in the furnace.
联合国气候变化框架公约》(UNFCCC)指出,印度尼西亚致力于为全球气候变化解决方案做出贡献。政府还将继续鼓励开发一些基于可再生能源(EBT)的发电项目。这是基于可再生能源的使用率仍然较低,约为(1.9%)8215.5 兆瓦。同时,EBT 成为能源的潜力约为 443208 兆瓦。在印尼,生物质能是一种可利用的 EBT 来源。生物质共燃是一种相对便宜的选择,而且不需要投资新建发电厂。然而,联合燃烧有几个方面需要研究,如燃烧温度和气体排放的产生。因此,本研究旨在确定棕榈核壳生物质共燃产生的温度和排放量。本研究采用计算流体动力学方法在火炉锅炉模型上进行。研究的测试参数为炉膛内的最高温度和平均温度,以及燃烧锅炉炉膛内二氧化碳和二氧化硫的平均值和最大值。研究发现,随着生物质共燃部分的增加,燃烧温度降低。然而,随着生物质共燃部分的增加,二氧化碳气体排放量增加,二氧化硫减少,这表明有害气体排放量减少,炉内燃烧完全。
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引用次数: 0
Impact Tip Speed Ratio in Performance Analysis for Horizontal Axis Wind Turbine (HAWT) with Optimal Twist and Tapered (OPT) Blade Shape 采用最佳扭转和锥形叶片 (OPT) 的水平轴风力涡轮机 (HAWT) 性能分析中的叶尖速比的影响
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.1832
Muhammad Al, Ain Mat Zin, I. A. Ishak, Mohammad Arafat, N. Samiran, Norain Sahari
Performance for Horizontal Axial Wind Turbine (HAWT) is influenced by the difference in tip speed ratio (TSR) and mesh distribution. The objective of this article is to study the optimal performance of wind turbines when subjected to different mesh resolution, TSR and wind speed velocity.Therefore, it is important to study the effects of different mesh resolutions in terms of wind turbine performance. To achieve that, a 0.65m optimal twist and tapered (OPT) blade is used with various inlet velocities and TSR. This study uses the k-ꞷ shear-stress transport (SST) based Reynold-Average Navier Stokes (RANS) approach in commercial ANSYS Fluent CFD software. This simulation was performed using the Moving Ratio Frame (MRF) method. To find the optimum grid resolution, a Grid Independence Test (GIT) was conducted comparing the coefficient of power (Cp). From the RESULT, TSR 6 shows the best HAWT performance when Cp for inlet velocity 8 m/s is 0.2608.
水平轴流式风力涡轮机(HAWT)的性能受到风尖速比(TSR)和网格分布差异的影响。因此,研究不同网格分辨率对风机性能的影响非常重要。为此,我们使用了一个 0.65 米的最佳扭曲锥形(OPT)叶片,并采用了不同的入口速度和 TSR。本研究在商用 ANSYS Fluent CFD 软件中使用了基于雷诺平均纳维斯托克斯(RANS)方法的 k-ꞷ 剪切应力传输(SST)。该模拟采用移动比率框架 (MRF) 方法进行。为找到最佳网格分辨率,进行了网格独立性测试 (GIT) 以比较功率系数 (Cp)。结果显示,当入口速度为 8 米/秒时的 Cp 为 0.2608 时,TSR 6 的 HAWT 性能最佳。
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引用次数: 0
Analysis of Mesh Resolution Effect to Numerical Result of CFD-ROM: Turbulent Flow in Stationary Parallel Plate 网格分辨率对 CFD-ROM 数值结果的影响分析:静止平行板中的湍流
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.117
C. D. Widiawaty, A. I. Siswantara, M. A. Budiyanto, Mohammad Arif Andira, D. Adanta, M. Hilman, Gumelar Syafe’i, T. A. Farhan, Illa Rizianiza
Computational fluid dynamics (CFD) is extensively utilized to predict flow behaviour in various industries and applications. The Full Order Model (FOM) is a high-accuracy approach to flow modelling, but it requires significant computational resources due to its high order and thousands of variables. To address this problem, the Reduced Order Model (ROM) was developed. Despite the advancement brought by ROM, there is a notable gap in research concerning the impact of mesh configuration on CFD-ROM results. While the number of modes has been extensively studied for its influence on CFD-ROM, the mesh configuration, a critical aspect of the simulation process, has received relatively limited attention. This study investigates the effect of mesh resolution on numerical results in CFD-ROM concerning turbulent flow within stationary parallel plates. Employing rigorous methods, including Richardson Extrapolation, verification, validation, and error percentage. The results explicitly confirm that mesh resolution directly impacts the numerical results of the velocity field in CFD-ROM. It is found that there is a notable reduction in Convergence Grid Index (CGI) values for different mesh ratios: 6.401% for medium-to-coarse and 2.031% for fine-to-medium ratio. Thus, with the same mode number, mesh resolution selection can enhance the numerical result of the velocity field in CFD-ROM.
计算流体动力学(CFD)被广泛用于预测各种行业和应用中的流动行为。全阶模型(FOM)是一种高精度的流动建模方法,但由于其阶数高,变量多达数千个,因此需要大量的计算资源。为了解决这个问题,人们开发了降阶模型(ROM)。尽管 ROM 带来了进步,但关于网格配置对 CFD-ROM 结果影响的研究仍存在明显差距。虽然模式数量对 CFD-ROM 的影响已得到广泛研究,但网格配置作为模拟过程的一个关键方面,受到的关注却相对有限。本研究探讨了网格分辨率对有关静止平行板内湍流的 CFD-ROM 数值结果的影响。采用了严格的方法,包括理查德森外推法、验证、确认和误差百分比。结果明确证实,网格分辨率直接影响 CFD-ROM 中速度场的数值结果。研究发现,在不同的网格比例下,收敛网格指数(CGI)值明显降低:中-粗比为 6.401%,细-中比为 2.031%。因此,在模式数相同的情况下,网格分辨率的选择可以提高 CFD-ROM 中速度场的数值结果。
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引用次数: 0
A Comparative Study on Hydrodynamic Analysis with and without Cavitation Modelling: A Study on Textured Slip Journal Bearing 有无气蚀建模的流体力学分析比较研究:纹理滑动轴承研究
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.4863
Althesa Androva, Muhammad Tauviqirrahman, Nazaruddin Sinaga, Muhammad Khafidh, Muhammad Sagaf, Hafid
In journal bearing modeling, the phenomenon of cavitation is very important to improve the accuracy of the simulation results. This is because cavitation will almost certainly occur because there are convergent and divergent geometries. The results of the simulation will be close to real conditions so that it can have a positive effect on researchers in order to design optimal journal bearings. The effect of modeling without cavitation and with cavitation on journal bearing modeling has a great influence on the lubrication performance of journal bearings. In modeling with cavitation, the maximum hydrodynamic pressure and load carrying capacity that the journal bearing is capable of relying on has a fairly rapid increase. The modeling results also relate to the friction force that occurs in the journal bearing. The aim of the present study is to explore the effect of inclusion of modeling of the Hydrodynamic pressure. The finite volume method based on software is used to compare the result with and without cavitation. Here, The mixture multiphase cavitation is adopted. The numerical result show t he effect of modelling without cavitation and with cavitation on journal bearing modelling has a great influence on the lubrication performance of journal bearings. In modelling with cavitation, the maximum hydrodynamic pressure and load cmarrying capacity that the journal bearing is capable of relying on has a fairly rapid increase. The modelling results also relate to the friction force that occurs in the journal bearing.
在轴颈轴承建模中,气蚀现象对于提高模拟结果的准确性非常重要。这是因为,由于存在收敛和发散几何形状,气蚀几乎肯定会发生。模拟结果将接近真实情况,从而对研究人员设计最佳轴颈轴承产生积极影响。无气蚀和有气蚀建模对轴颈轴承建模的影响对轴颈轴承的润滑性能有很大影响。在有气蚀的建模中,轴颈轴承所能依靠的最大流体动力压力和承载能力会有相当快的增长。建模结果还与发生在轴颈轴承中的摩擦力有关。本研究的目的是探讨加入流体动力压力建模的效果。使用基于软件的有限体积法对有气蚀和无气蚀的结果进行比较。这里采用的是混合多相气蚀。数值结果表明,无气蚀和有气蚀的轴颈轴承模型对轴颈轴承的润滑性能有很大影响。在有气蚀的建模中,轴颈轴承所能依靠的最大流体动力压力和载荷承载能力会有相当快的增长。建模结果还与发生在轴颈轴承中的摩擦力有关。
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引用次数: 0
Analysis and Prediction of Equivalent Diameter of Air Bubbles Rising in Water 水中气泡上升等效直径的分析与预测
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.3347
Gabriel de Carvalho Nascimento, Roger Matsumoto Moreira, Felipe Pereira de Moura, William Alves Tavares, Thiago Ferreira Bernardes Bento, Lorena Brandão Calazan, Milena Silva Andrade, Beatriz Freitas Rezende
The equivalent diameter of rising bubbles in liquids is an important parameter that has been investigated for decades by researchers for different purposes. Bubble diameter plays important role in quantifying oil and gas leaks in subsea leak analysis, since it allows the prediction of the magnitude of leaks in seabed petroleum wells and other structures through images obtained by underwater vehicles at great depths. Most studies available in the literature on the subject focus on investigating air bubbles in water; therefore, they were used as the main guide of the experimental apparatus described in this article. Several tests were conducted with air bubble chain in tap water, whose flow rate ranged from 21.1 mL/min to 234.4 mL/min, whereas the bubble equivalent diameter ranged from 4.1 mm to 8.2 mm. In addition, computational fluid dynamics simulations were carried out for comparison purposes; they were validated as potential tools to help designing an automated subsea gas leakage monitoring system based on image analysis algorithms. The herein proposed model could be both analytically and experimentally validated, based on comparisons to findings reported by other authors. This procedure enabled gathering evidence about the most efficient analytical predictions available in the literature for the herein addressed scenario. The results in the present study are consistent to those recorded in the main related articles.
液体中上升气泡的等效直径是一个重要参数,几十年来研究人员出于不同目的对其进行了研究。在水下泄漏分析中,气泡直径在量化石油和天然气泄漏方面发挥着重要作用,因为它可以通过水下航行器在很深的水下获得的图像预测海底油井和其他结构的泄漏量。文献中有关该主题的大多数研究都侧重于调查水中的气泡;因此,这些研究被用作本文所述实验设备的主要指导。对自来水中的气泡链进行了多次测试,其流速从 21.1 毫升/分钟到 234.4 毫升/分钟不等,气泡等效直径从 4.1 毫米到 8.2 毫米不等。此外,还进行了计算流体动力学模拟,以进行比较;这些模拟被验证为潜在的工具,有助于设计基于图像分析算法的海底气体泄漏自动监测系统。在与其他作者报告的结果进行比较的基础上,本文提出的模型可以通过分析和实验进行验证。通过这一过程,可以收集到文献中针对本文所述情况的最有效分析预测的证据。本研究的结果与主要相关文章中记录的结果一致。
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引用次数: 0
Simulation Approach of Photovoltaic Thermal Based on Water Collector with Rectangular Model 基于矩形集热器的光电热模拟方法
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.121137
Muhammad Zohri, Prabowo, Suwarno, Ahmad Fudholi, Sena Abraham Irsyad, Ajeng Tri Rahayu, Yadi Radiansah, Dalmasius Ganjar Subagio, Yusuf Suryo Utomo, Aep Saepudin
The advancement of PVT technology in the contemporary era is experiencing an upward trend. This phenomenon can be attributed to the growing societal demand for energy, particularly renewable energy derived from solar sources. The present study investigates the rectangular configuration of a water-based heat absorber within a photovoltaic-thermal (PVT) system. The rectangular model PVT system was simulated using nine different mass flow rate of water variations within the rectangular model channel. The dataset has nine mass flow rate of water variants ranging from 0.001 kg/s to 0.009 kg/s, as well as six solar radiation variations: 500 W/m2, 600 W/m2, 700 W/m2, 800 W/m2, 900 W/m2, and 1000 W/m2. The maximum average outlet temperature achieved under 1000 W/m2 solar radiation is 50.53%, given a 0.001 kg/s fluid mass flow rate. The maximum average photovoltaic (PV) efficiency is 11.93% when exposed to 500 W/m2 solar radiation intensity. The maximum average photovoltaic-thermal (PVT) efficiency is 76.23% when exposed to 500 W/m2 solar radiation intensity. Therefore, utilizing rectangular collectors in water-based photovoltaic-thermal systems potentially substantially enhanced the average thermal efficiency and overall PVT efficiency. Consequently, it is advisable to consider incorporating rectangular collectors in the future improvements of PVT technology.
当代光伏发电技术的发展呈上升趋势。这一现象可归因于社会对能源,尤其是来自太阳能的可再生能源日益增长的需求。本研究调查了光伏热发电(PVT)系统中水基吸热器的矩形配置。利用矩形模型通道内九种不同质量流量的水变化对矩形模型 PVT 系统进行了模拟。数据集包含九种水的质量流量变化,从 0.001 kg/s 到 0.009 kg/s,以及六种太阳辐射变化:500 W/m2、600 W/m2、700 W/m2、800 W/m2、900 W/m2 和 1000 W/m2。在 0.001 kg/s 的流体质量流量条件下,1000 W/m2 太阳辐射条件下的最大平均出口温度为 50.53%。在 500 W/m2 太阳辐射强度下,最大平均光电(PV)效率为 11.93%。当太阳辐射强度为 500 W/m2 时,最大平均光电热(PVT)效率为 76.23%。因此,在水基光电热系统中使用矩形集热器可大幅提高平均热效率和整体光电热效率。因此,在未来改进光伏热技术时,最好考虑采用矩形集热器。
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引用次数: 0
The impact of mechanical ventilation on Sfax City's greenhouse microclimate 机械通风对斯法克斯市温室小气候的影响
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.150162
Hamza Chiboub, Hasna Abid, mariem lajnef, Slim Zouari, Giovanni Gugliuzza, Maroua Mejri, Emilia Arrabito, zied Driss
The greenhouse serves as an enclosed structure designed to create a conducive environment for agricultural productivity, irrespective of the challenges posed by seasonal variations. Recognizing the contemporary complexities in agricultural management, our research endeavors involve the development of a comprehensive numerical model and the establishment of an experimental setup to delve into the nuanced impact of mechanical ventilation. Specifically, the study investigates the influence of four different entrance velocity values on airflow dynamics within agricultural greenhouses. The results illuminate the direct correlation between inlet velocity and various crucial variables, including temperature distribution, velocity field distribution, DO irradiation distribution, and static pressure distribution. Notably, at Vint = 12 m.s-1, the maximum temperature remains below Tmax = 307 K, while at Vint = 3 m.s-1, it reaches Tmax = 327 K. This underscores the pivotal role of accurate modeling and control for the optimal management of agriculture in the central region of Tunisia, particularly in Sfax.
温室是一种封闭式结构,旨在为农业生产创造有利环境,而不受季节变化带来的挑战的影响。认识到当代农业管理的复杂性,我们的研究工作包括开发一个综合数值模型和建立一个实验装置,以深入研究机械通风的细微影响。具体来说,研究调查了四种不同的入口速度值对农业温室内气流动态的影响。结果表明,入口速度与各种关键变量(包括温度分布、速度场分布、溶解氧辐照分布和静压分布)之间存在直接关联。值得注意的是,当 Vint = 12 m.s-1 时,最高温度保持在 Tmax = 307 K 以下,而当 Vint = 3 m.s-1 时,最高温度达到 Tmax = 327 K。
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引用次数: 0
Enhancing Electric Vehicle Battery Thermal Management using Phase Change Materials: A CFD Analysis for Improved Heat Dissipation 利用相变材料加强电动汽车电池热管理:改进散热的 CFD 分析
Q2 Mathematics Pub Date : 2024-04-05 DOI: 10.37934/cfdl.16.8.138149
Divyashetty, Mohammad Zuber, Chethan K N, Laxmikant G Keni, Irfan Anjum Badruddin Magami, Chandrakant R Kini
The adverse environmental issues and climate change has compelled world to shift to renewable energy systems. Conventional IC engines are the major contributor for air pollution which is the main cause for the global warming. Therefore, EVs (Electric Vehicle) are the future of the automotive industry. The important issues faced by EVS are battery heat generation. Hence in order to remove heat efficiently from the EV battery CFD analysis of a passive thermal management system using PCM for Li-ion batteries is studied for three different discharge rates. Compared to bare cell, the cell with passive BTMS reduces the maximum temperature rise by 2%, 2.1% and 1% at discharge rates of 1.5 C, 1.0 C and 0.5 C respectively thus implying that the BTMS adopted is effective in removing heat from the surface of the cell.
不利的环境问题和气候变化迫使全世界转向可再生能源系统。传统的集成电路发动机是造成空气污染的主要因素,而空气污染是全球变暖的主要原因。因此,EV(电动汽车)是汽车行业的未来。电动汽车面临的重要问题是电池发热。因此,为了有效地去除电动汽车电池中的热量,我们对使用 PCM 的锂离子电池被动热管理系统进行了 CFD 分析,研究了三种不同的放电速率。与裸电池相比,在放电速率为 1.5 C、1.0 C 和 0.5 C 时,装有无源 BTMS 的电池的最大温升分别降低了 2%、2.1% 和 1%,这表明所采用的 BTMS 能有效去除电池表面的热量。
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引用次数: 0
Optimization of Flanged Diffuser for Small-Scale Wind Power Applications 优化小型风力发电应用中的法兰扩散器
Q2 Mathematics Pub Date : 2024-03-04 DOI: 10.37934/cfdl.16.7.5470
Mostafa Radwan Behery, D. H. Didane, B. Manshoor
The development of renewable and clean energy has become more crucial to societies due to the increasing energy demand and fast depletion of fossil fuels. A state-of-the-art design for an augmented wind turbine has been introduced in the past years to increase the efficiency of compact horizontal axis wind turbines, exceeding the ideal Betz’s limit of the maximum energy captured from the wind. The optimization of the flanged diffuser - so-called diffuser augmented wind turbine DAWT - is investigated numerically using the multi-objective genetic algorithm “MOGA”. A 2D computational model is developed using ICEM CFD and solved by ANSYS Fluent. The Turbulence model selected is shear stress transport K-omega, with a pressure-based solver and a coupled algorithm scheme. The optimization objectives are to maximize the velocity ratio at the shroud throat and minimize shroud form dimensions. 517 design points were solved, and the design dimensions were categorized into four types: compact, small, medium, and large design. The results showed that the diffuser dimensions are the main parameters to increase velocity inside the shroud throat, where a long diffuser with a low converging angle drags more air inside the shroud, reaching in some cases more than double the upwind velocity. While the nozzle and flange are also effective in the different design types. It was found that a super long diffuser with a length ratio of 2.9 LD to throat diameter D is optimal with a diverging angle of 7.6˚, accompanied by a nozzle of ratio 1.2 LN/D and 12.6˚ converging angle and a flange length ratio of 0.6 LF/D. This optimal design increased the velocity ratio by almost 2.5 times.
由于能源需求的不断增长和化石燃料的快速枯竭,开发可再生清洁能源对社会变得越来越重要。为了提高紧凑型水平轴风力涡轮机的效率,过去几年中引入了一种最先进的增强型风力涡轮机设计,其最大风能捕获量超过了理想的贝茨极限。使用多目标遗传算法 "MOGA "对法兰扩散器(即扩散器增强型风力涡轮机 DAWT)的优化进行了数值研究。使用 ICEM CFD 开发了一个二维计算模型,并通过 ANSYS Fluent 进行求解。选择的湍流模型是剪应力传输 K-omega,采用基于压力的求解器和耦合算法方案。优化目标是最大化护罩喉部的速度比,最小化护罩外形尺寸。求解了 517 个设计点,并将设计尺寸分为四种类型:紧凑型、小型、中型和大型设计。结果表明,扩散器尺寸是提高护罩喉部内速度的主要参数,其中,低收敛角的长扩散器可将更多空气拖入护罩内,在某些情况下可达到上风速度的两倍以上。喷嘴和法兰在不同的设计类型中也很有效。研究发现,长度比为 2.9 LD 的超长扩散器与喉管直径 D 的发散角为 7.6˚,喷嘴比为 1.2 LN/D,收敛角为 12.6˚,法兰长度比为 0.6 LF/D。这种最佳设计将速度比提高了近 2.5 倍。
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引用次数: 0
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