International Journal of Fluid Engineering最新文献_第2页

Investigations on affinity law under gas–liquid conditions in multistage radial and mixed-flow multiphase pumps 多级径向和混流多相泵气液条件下的亲和定律研究

International Journal of Fluid Engineering Pub Date : 2024-03-01 DOI: 10.1063/5.0191201

Liang Chang, Chenyu Yang, Xiaobin Su, Xiaoyu Dai, Qiang Xu, Liejin Guo

{"title":"Investigations on affinity law under gas–liquid conditions in multistage radial and mixed-flow multiphase pumps","authors":"Liang Chang, Chenyu Yang, Xiaobin Su, Xiaoyu Dai, Qiang Xu, Liejin Guo","doi":"10.1063/5.0191201","DOIUrl":"https://doi.org/10.1063/5.0191201","url":null,"abstract":"Affinity laws have been widely used in pump design and simulation under high-temperature and corrosive conditions. By applying such laws, it is possible to shorten development cycles and reduce test costs. However, current applications of affinity laws are still limited to liquid conditions. In this paper, expressions for affinity laws and their applicability are investigated for multistage radial and mixed-flow multiphase pumps under gas–liquid conditions. A high-pressure (30 MPa) gas–liquid experimental platform is constructed, and three-stage and 25-stage radial pumps and a 15-stage mixed-flow pump are investigated, with specific speeds of 107 and 216. With gas compressibility taken into account, the gas–liquid two-phase flow rate, head, and power, and the corresponding dimensionless hydraulic coefficients, are defined for multiphase pumps. The deterioration of gas–liquid pressurization performance is found to be divided into three processes with different dynamic mechanisms, corresponding to three flow patterns. The inlet gas volume fraction of pump is used to judge dynamic similarity. At the same inlet gas volume fractions λ1 = λ2, when the gas–liquid flows in two pumps have the same flow pattern, dynamic similarity will be satisfied. The affinity law that is established shows good applicability to the three-stage radial multiphase pump, with goodness of fit R2 larger than 0.9 for the two-phase Ψm–Φm and Πm–Φm performance curves. Finally, experimental results indicate that the affinity law also has good applicability to multiphase pumps with different stage numbers and blade structures under gas–liquid conditions.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":"279 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140286956","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

Improving the hydraulic performance of a high-speed submersible axial flow pump based on CFD technology 基于 CFD 技术提高高速潜水轴流泵的水力性能

International Journal of Fluid Engineering Pub Date : 2024-02-29 DOI: 10.1063/5.0191683

Lu Rong, Martin Böhle, Yandong Gu

{"title":"Improving the hydraulic performance of a high-speed submersible axial flow pump based on CFD technology","authors":"Lu Rong, Martin Böhle, Yandong Gu","doi":"10.1063/5.0191683","DOIUrl":"https://doi.org/10.1063/5.0191683","url":null,"abstract":"The hydraulic performance of a high-speed submersible axial flow pump is investigated to reduce its energy consumption. A more efficient and stable optimization method that combines parametric design, computational fluid dynamics, and a computer algorithm is proposed. The main aim is to broaden the high-efficiency operating zone, so the average efficiency under multiple conditions is optimized while considering rotor–stator matching. The design-of-experiments method and a radial-basis-function neural network are combined to form the optimization platform, and automatic optimization of the pump design is realized through repeated execution of design and simulation. The flow loss mechanism inside the pump is studied in depth via the entropy generation rate, and regression analysis shows that the pump efficiency is influenced mainly by the blade angles. After optimization, the target efficiency is increased by 8.34%, and the flow field distribution shows that the channel vortex and hydraulic loss are controlled effectively. Finally, the results are validated by experiment. The proposed optimization approach has advantages in saving manpower and obtaining globally optimal solutions.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":"2005 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140416473","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

Flapping vortex dynamics of two coupled side-by-side flexible plates submerged in the wake of a square cylinder 浸没在方形圆柱体尾流中的两块并排耦合柔性板的襟翼涡动力学

International Journal of Fluid Engineering Pub Date : 2024-02-28 DOI: 10.1063/5.0191621

Bin Xu, Hao Wang, Weibin Zhang, Yilin Deng, Xiaoju Shen, Desheng Zhang, B. (Bart) van Esch

引用次数: 0

Effects of interface model on performance of a vortex pump in CFD simulations CFD 模拟中界面模型对旋涡泵性能的影响

International Journal of Fluid Engineering Pub Date : 2024-02-28 DOI: 10.1063/5.0196213

Wenguang Li

{"title":"Effects of interface model on performance of a vortex pump in CFD simulations","authors":"Wenguang Li","doi":"10.1063/5.0196213","DOIUrl":"https://doi.org/10.1063/5.0196213","url":null,"abstract":"That the predicted head of a vortex pump is higher than that measured experimentally is very common in simulations of turbulent flow in such pumps. To identify why, reported here is a study of the turbulent flow of water in a vortex pump with a specific speed of 76 and fluid domains with 1/8-impeller and whole-impeller geometrical models and smooth walls using the 3D steady Reynolds-averaged Navier–Stokes equations, the standard k–ɛ model, and a scalable wall function in ANSYS CFX 2019 R2. The results show that the aforementioned phenomenon is related to the choice of interface model. With the 1/8-impeller model, the head predicted by the frozen rotor model agrees with the experimental head. By contrast, the transient rotor model provides a reasonably accurate head against the experimental head but requires huge computing resources and overestimates the pump efficiency, and the stage model is unsuitable for predicting the head of the pump. The flow patterns in the vaneless chamber and impeller predicted with the 1/8-impeller model are more uniform because of artificial fluid mixing on the interface than those predicted with the whole-impeller model by using the frozen rotor model, and the flow patterns predicted with the whole-impeller model by using the transient rotor model are in between. The hydraulic performance of the pump is predicted with the 1/8-impeller model and frozen rotor model at various viscosities, and the flow-rate, head, and efficiency correction factors are determined and correlated with the impeller Reynolds number.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140420033","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

Rapid validation of water wave metamaterials in a desktop-scale wave measurement system 水波超材料在桌面级波浪测量系统中的快速验证

International Journal of Fluid Engineering Pub Date : 2024-02-26 DOI: 10.1063/5.0191033

Yi Huang, S. Dai, Zhi-Ming Yuan, Laibing Jia

引用次数: 0

Computational study of flow separation in truncated ideal contour nozzles under high-altitude conditions 高海拔条件下截断理想轮廓喷嘴中的流动分离计算研究

International Journal of Fluid Engineering Pub Date : 2024-02-26 DOI: 10.1063/5.0190399

Ijas Muhammed, Shamsia Banu N, A. Suryan, V. Lijo, D. Šimurda, Heuy Dong Kim

引用次数: 0

Inaugural editorial 就职社论

International Journal of Fluid Engineering Pub Date : 2024-01-24 DOI: 10.1063/5.0194224

Gensheng Li

引用次数: 0