International Journal of Fluid Machinery and Systems最新文献_第9页

Numerical Analysis of Standard - Unstandard Gears for an External Gear Pumps 外啮合齿轮泵标准和非标准齿轮的数值分析

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.025

A. Saleem, Bahjat Hassan Alyas, Zaid A. Shaalan

引用次数: 2

Aerodynamic Performance of an Annular Combustion Chamber Cooling with Swirler Design 旋流器设计环形燃烧室冷却的气动性能

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.001

C. Dinh, X. Le, T. Hoang, Q. Pham

引用次数: 2

Research on Deformation of Flexible Side Plates in Intra-Vane Type Pumps and its Effect on Oil Film Thickness of the Flow Distribution Pair 叶片内泵柔性侧板变形及其对配流副油膜厚度影响的研究

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.109

S. Li, Hui Wang, Pan Yang, Yi Li, Junhu Yang

{"title":"Research on Deformation of Flexible Side Plates in Intra-Vane Type Pumps and its Effect on Oil Film Thickness of the Flow Distribution Pair","authors":"S. Li, Hui Wang, Pan Yang, Yi Li, Junhu Yang","doi":"10.5293/IJFMS.2021.14.1.109","DOIUrl":"https://doi.org/10.5293/IJFMS.2021.14.1.109","url":null,"abstract":"This paper sets up both a force balance equation and a three-dimensional geometric model of a flexible side plate in an intra-vane type pump, after analyzing the structure and mechanical properties of the plate. The formulas for calculating deformation were obtained, and the theoretical curve of change in deformation was determined. Then, the contour of deformation was obtained using software simulation. The calculated and simulated values of deformation of the flexible side plate, in three positions under four working pressures, were found to be close to one another, the relative error between them being less than 2%. Next, the formula for the calculation of oil film thickness was obtained, and the curve of the change in oil film thickness relative to the distance along the radial direction of the side plate was determined, considering the flexible side plate deformation. The oil film thickness for three flexible side plate positions were then tested through experiment. The calculated values of oil film thickness were also close to the tested values. Although there was a small difference, the relative error between them was less than 5% for the oil film thickness measured at its lowest point, which indicates the accuracy of the results obtained by the theoretical calculation.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41438253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Stagger Angle on the Three-Dimensional Separation Around a NACA65 Blade in a Decelerating Flow 减速流中错转角对NACA65叶片三维分离的影响

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.034

Y. Kinoue, Yuya Matsumoto, Masaki Sakaguchi, N. Shiomi

引用次数: 0

Behaviors of Surge Frequencies in Multi-stage Axial Flow Compressors over a Wide Range of Speeds 多级轴流压缩机在宽转速范围内的喘振频率特性

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.062

N. Yamaguchi

{"title":"Behaviors of Surge Frequencies in Multi-stage Axial Flow Compressors over a Wide Range of Speeds","authors":"N. Yamaguchi","doi":"10.5293/IJFMS.2021.14.1.062","DOIUrl":"https://doi.org/10.5293/IJFMS.2021.14.1.062","url":null,"abstract":"The fundamental behaviors of deep surge frequencies in axial-flow compressors have come to be described as a rather simple framework for low pressure-ratio compressors, in terms of two essential reduced frequencies concerning resonance frequencies and surge frequencies, on the basis of numerical-experimental results. For high-pressure-ratio multi-stage compressors, however, the frequency behaviors over a wide range of compressor speeds tend to give drastic deviations from the simple framework, including abrupt changes and apparent irregularities. The cause was investigated here by numerical simulations on a nine-stage axial flow compressor. Generally, deep surge frequencies of high-pressure ratio compressors tend to lower gradually, from low speeds toward higher ones. At somewhat below the design speed, the frequencies tend to decrease precipitously, settling to some very low levels of values. The discontinuous drops in the frequencies are shown to result from occurrences of short-term incomplete surge recoveries in the stalling phase of surge. The phenomenon tends to elongate the duration of the stalled phase and the whole surge duration, resulting in the lowered surge frequency. The phenomenon is caused by the flow reversal of high-temperature air in the stalling phase of surge and the re-suction of the hot air in the unstalling phase. The degree of the peak temperature and the intensity of the interferences between the hot-air re-suction phenomenon and the intrinsic surge appear to affect significantly the additional short-term premature stalling of the compressor. It could be strongly related with the high average temperature due to the hot air re-suction, and the duration time of the suction. The complicated behaviors thus become qualitatively explainable, though only by examinations on numerical-simulation results.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49440408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of Blade Number on Performance and Internal Flow Condition of Centrifugal Pump for Low Viscous Fluid Food 叶片数对低粘性流体食品离心泵性能及内部流动状况的影响

International Journal of Fluid Machinery and Systems Pub Date : 2021-03-31 DOI: 10.5293/IJFMS.2021.14.1.132

T. Shigemitsu, Eito Nakaishi, M. Maeda, Y. Araki

{"title":"Influence of Blade Number on Performance and Internal Flow Condition of Centrifugal Pump for Low Viscous Fluid Food","authors":"T. Shigemitsu, Eito Nakaishi, M. Maeda, Y. Araki","doi":"10.5293/IJFMS.2021.14.1.132","DOIUrl":"https://doi.org/10.5293/IJFMS.2021.14.1.132","url":null,"abstract":"There are many kinds of the fluid food transportation pumps depending on the characteristics of the fluid, i.e. a sanitary pump made from stainless steel, a screw pump and so on. A centrifugal pump was adopted as a fluid food pump in this research because it makes the stable continuous transportation of fluid food and the structure of the pump is simple compared to positive displacement pumps. The purpose of this research is to investigate the influence of the blade number on the pump performance and internal flow to enrich the pump design data for low viscous fluid food. The centrifugal pump with an open impeller was used and six impellers having the different blade number were prepared. Performance test using an experimental apparatus was conducted and the numerical analysis was also carried out. In the numerical analysis, the commercial software ANSYS-CFX16.2 was used. The head, shaft power and efficiency obtained by the numerical analysis, are almost the same with the experimental results. The head and shaft power increase with the increase of the blade number. The shear rate, which is concerned to fluid food quality, is high near the inlet region of the blade-to-blade passage for all types of blades. The shear rate of each type of the blade is discussed based on the numerical analysis results and relations between the blade number and shear rate are clarified.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48688764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Evaluation of Suction Performance of Inducer with Splitter Blade 分流叶片诱导器吸力性能评价

International Journal of Fluid Machinery and Systems Pub Date : 2021-01-01 DOI: 10.5293/IJFMS.2021.14.1.13

Yohei Tanaka, T. Kitabata, S. Watanabe, S. Ohashi, A. Sakata, Y. Matsunaga

{"title":"Evaluation of Suction Performance of Inducer with Splitter Blade","authors":"Yohei Tanaka, T. Kitabata, S. Watanabe, S. Ohashi, A. Sakata, Y. Matsunaga","doi":"10.5293/IJFMS.2021.14.1.13","DOIUrl":"https://doi.org/10.5293/IJFMS.2021.14.1.13","url":null,"abstract":"For general-use turbopumps with inducer, instability-free operation is required as well as high suction performance in a wide operating range from shut-off to over flow rates. Among the instabilities, the cavitation surge at low flow rates is a very vital phenomenon that is known to be strongly associated with the occurrence of inlet back flow. The low inlet blade angle would be favorable for the suppression of inlet backflow through the reduction of blade loading at the inlet, while the inlet throat area should be kept large for better suction performance to minimize the flow blockage due to cavitation. In the present study, a splitter blade inducer is designed on the basis of the knowledge acquired by our previous CFD study conducted for the 2-D cascade and 3-D straight-hub inducer. Then the effectiveness of the splitter inducer is investigated by experiments and CFD. As a result, the inlet backflow and the cavitation surge are found to be suppressed in the splitter inducer, which is achieved by reducing the blade loading with low inlet blade angle. The suction performance is improved at high flow rates by relaxing the low pressure region with high relative velocity.","PeriodicalId":38576,"journal":{"name":"International Journal of Fluid Machinery and Systems","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71121329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Different Blade Numbers on the Radial Force of Pump as Turbine in Transient Process 不同叶片数对瞬态过程中泵作为涡轮径向力的影响

International Journal of Fluid Machinery and Systems Pub Date : 2021-01-01 DOI: 10.5293/IJFMS.2021.14.2.142

Shi Fengxia, Dedong Ma, Wanyong Zhao, H. Peng, Yueyong Liang

引用次数: 2

Boundary Layer Loss Reduction of Cascade Flow by Wide Chord 宽弦降低叶栅流动边界层损失的研究

International Journal of Fluid Machinery and Systems Pub Date : 2021-01-01 DOI: 10.5293/IJFMS.2021.14.2.168

S. Otsuki

引用次数: 1

Experimental Investigation of Fiber-concentration Distributions of Pulp Liquid Flow through a Divergent Tube 浆液在发散管中纤维浓度分布的实验研究

International Journal of Fluid Machinery and Systems Pub Date : 2021-01-01 DOI: 10.5293/IJFMS.2021.14.2.176

M. Sumida

引用次数: 0