水动力学研究与进展:英文版最新文献_第3页

A sharp interface approach for cavitation modeling using volume-of-fluid and ghost-fluid methods 使用流体体积和鬼流体方法进行空化建模的尖锐界面方法

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-12-01 DOI: 10.1016/S1001-6058(16)60806-5

Thad Michael , Jianming Yang , Frederick Stern

引用次数: 13

Simulation of cavitation induced by water hammer 水锤引起的空化模拟

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-12-01 DOI: 10.1016/S1001-6058(16)60811-9

Jie Geng (耿介), Xiu-le Yuan (苑修乐), Dong Li (李冬), Guang-sheng Du (杜广生)

引用次数: 15

Effect of the PTO damping force on the wave pressures on a 2-D wave energy converter PTO阻尼力对二维波能转换器波浪压力的影响

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-10-01 DOI: 10.1016/S1001-6058(16)60798-9

Xuan-lie Zhao (赵玄烈) , De-zhi Ning (宁德志) , Malin Göteman , Hai-gui Kang (康海贵)

引用次数: 6

Effect of polymer and fiber additives on pressure drop in a rectangular channel 聚合物和纤维添加剂对矩形通道压降的影响

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-10-01 DOI: 10.1016/S1001-6058(16)60799-0

Amir Eshghinejadfard, Kashyapa Sharma, Dominique Thévenin

{"title":"Effect of polymer and fiber additives on pressure drop in a rectangular channel","authors":"Amir Eshghinejadfard, Kashyapa Sharma, Dominique Thévenin","doi":"10.1016/S1001-6058(16)60799-0","DOIUrl":"10.1016/S1001-6058(16)60799-0","url":null,"abstract":"<div><p>The influence of minute amounts of additives on pressure drop is an interesting fundamental phenomenon, potentially with important practical applications. Change of the pressure drop in a quasi-two-dimensional channel flow using various additives is experimentally investigated. Tests were conducted for a wide range of concentrations (100 ppm–500 ppm) and Reynolds numbers (16 000– 36 000) with two polymers and four rigid fibers used as additive. Maximum drag reduction of 22% was observed for xanthan gum. However, xanthan gum loses its drag-reducing property rapidly. It was also seen that drag reduction percentage of xanthan gum remains almost constant for different Reynolds numbers. Guar flour demonstrated good drag reduction property at high Reynolds numbers. Drag reduction of 17.5% at <em>Re</em> =33 200 using 300 ppm solution was observed. However, at low Reynolds numbers guar flour will cause an increase in pressure drop. Fiber fillers (aspect ratio=21) have been tested as well. In contrast to polymers, they increased the drag for the range of examined concentrations and Reynolds numbers. Polyacrylonitrile fiber with three different aspect ratios (106, 200, 400) was also used, which showed an increase in pressure drop at low aspect ratios. Polyacrylonitrile fibers of larger lengths (6 mm) demonstrated minor drag-reducing effects (up to 3%).</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 5","pages":"Pages 871-878"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60799-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4054394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Capillary-gravity ship wave patterns 毛细管重力船波模式

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-10-01 DOI: 10.1016/S1001-6058(16)60794-1

Hui Liang , Xiaobo Chen

引用次数: 8

Stationary phase and practical numerical evaluation of ship waves in shallow water 浅水船舶波的定相与实际数值计算

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-10-01 DOI: 10.1016/S1001-6058(16)60793-X

Chen-liang Zhang (张晨亮) , Jin-bao Wang (王金宝) , Yi Zhu (朱怡) , Francis Noblesse

引用次数: 3

32nd International Workshop on Water Waves and Floating Bodies (IWWWFB2017) 第32届水波与浮体国际研讨会(IWWWFB2017)

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-10-01 DOI: 10.1016/S1001-6058(17)30008-2

Dezhi Ning, Bin Teng

引用次数: 0

Particle image velocimetry measurement of velocity distribution at inlet duct of waterjet self-propelled ship model 粒子图像测速法测量喷水自行船模型进气道速度分布

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-10-01 DOI: 10.1016/S1001-6058(16)60800-4

Jie Gong (龚杰), Chun-yu Guo (郭春雨), Tie-cheng Wu (吴铁成), Da-gang Zhao (赵大刚)

{"title":"Particle image velocimetry measurement of velocity distribution at inlet duct of waterjet self-propelled ship model","authors":"Jie Gong (龚杰), Chun-yu Guo (郭春雨), Tie-cheng Wu (吴铁成), Da-gang Zhao (赵大刚)","doi":"10.1016/S1001-6058(16)60800-4","DOIUrl":"10.1016/S1001-6058(16)60800-4","url":null,"abstract":"<div><p>A vehicle-mounted three-dimensional underwater particle image velocimetry (PIV) device is used in a towing tank to measure the velocity distribution of the inlet duct of a waterjet ship model in a self-propulsion test. The following points are shown through a comparison of the influences of the stationary and free states of the ship model on the measured results: (1) during the test, the ship attitude will change, specifically, the ship model will heave and trim, (2) the degree of freedom disturbs the processing of the pixel images enough to distort the subsequent image processing, (3) the stationary state of the ship model is the optimal mode for measuring the velocity distribution using the PIV device, and (4) if the changes must be considered, the man-made heaving and trimming may be pre-applied, and be made a corrected stationary mode. In addition, the momentum effect coefficient and the energy effect coefficient are calculated in a non-uniform inflowing state, and the related factors affecting the two coefficients are analyzed. The test results show that the pumping action of the waterjet creates a transverse vector in the cross-sectional speed, which increases the non-uniformity of the inflow. These results could help to establish the design requirements for a waterjet-propelled ship type.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 5","pages":"Pages 879-893"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60800-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4055667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

A 3-D numerical study of solitary wave interaction with vertical cylinders using a parallelised particle-in-cell solver 用平行粒子池求解器对孤立波与垂直圆柱体相互作用的三维数值研究

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-10-01 DOI: 10.1016/S1001-6058(16)60790-4

Qiang Chen , Jun Zang , David M. Kelly , Aggelos S. Dimakopoulos

引用次数: 9

Effects of rotational speeds on the performance of a centrifugal pump with a variable-pitch inducer 转速对带变螺距诱导器离心泵性能的影响

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-10-01 DOI: 10.1016/S1001-6058(16)60797-7

Xiao-mei Guo (郭晓梅) , Zu-chao Zhu (朱祖超) , Gao-ping Shi (施高萍) , Yong Huang (黄勇)

{"title":"Effects of rotational speeds on the performance of a centrifugal pump with a variable-pitch inducer","authors":"Xiao-mei Guo (郭晓梅) , Zu-chao Zhu (朱祖超) , Gao-ping Shi (施高萍) , Yong Huang (黄勇)","doi":"10.1016/S1001-6058(16)60797-7","DOIUrl":"10.1016/S1001-6058(16)60797-7","url":null,"abstract":"<div><p>The centrifugal pumps usually work at various rotational speeds. The variation in the rotational speeds will affect the internal flow, the external performance, and the anti-cavitation performance of the pump. In order to improve the anti-cavitation performance of the centrifugal pumps, variable-pitch inducers are placed upstream of the impeller. Because the rotational speeds directly affect the flow and the performance of the pump, it is essential to characterize the performance of the pump with a variable-pitch inducer at various rotational speeds. In this paper, the simulations and the experimental tests of a centrifugal pump with a variable-pitch inducer are designed and carried out under various rotational speed conditions. Navier-Stokes equations, coupled with a Reynolds average simulation approach, are used in the simulations. In the experimental tests, the external and anti-cavitation performances of the pump are investigated in a closed system. The following results are obtained from the simulations. Firstly, the velocity in the passage of the inducer rises with the increase of the rotational speed. Secondly, the static pressure escalates on the inducer and the impeller with the increase of the rotational speed. Thirdly, the static pressure distribution on the inducer and the impeller is asymmetric. Fourthly, the anti-cavitation performance of the pump deteriorates with the increase of the rotational speed. Additional results are gathered from an analysis of the experiments. <em>H − Q</em> curves are similar parabolas at various rotational speeds, while <em>η − Q</em> curves are similar parabolas only when n ≤ 6 000 r/min. The anti-cavitation performance of the pump deteriorates with the increase of the rotational speed. Finally, the simulation results are found to be consistent with the experimental results.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 5","pages":"Pages 854-862"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60797-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4054393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26