摘要
为改善水力机械的空化现象,基于流动控制结构布置原则和波茨坦水池测试(PPTC)螺旋桨空化流场特性,在保障整体性能的前提下,分别在叶尖与叶根位置设计控制结构进行局部调控。对比分析4种改进螺旋桨与原始螺旋桨的空化流场特性,研究控制结构对螺旋桨空化流场调控的作用机理。结果表明:添加控制结构牺牲了较小的效率,显著减小了空泡区域体积,改善了螺旋桨综合性能;重载工况下,PPTC-t2螺旋桨的综合性能最好,效率损失了0.134%,空泡区域体积减小了24.6%;设计工况下,PPTC-t1螺旋桨的综合性能最好,效率损失了0.284%,空泡区域体积减小了19.5%;控制结构附近流速降低,诱发了局部高压,延缓了空化发生,实现了空化流场的局部调控。研究为改善水力机械的空化问题提供了有效途径。
In order to ameliorate the cavitation of hydraulic machinery,based on the principle of control structure arrangement and the cavitation flow field of the PPTC propeller,under the premise of ensuring the overall performance,control structures are designed at the blade tip and the blade root for local regulation.The cavitation flow field characteristics of four modified propellers and the original propeller are compared and analyzed to study the mechanism of control structures effecting on the regulation of propeller cavitation flow field.The results show that additional control structures significantly reduce the volume of cavitation area with a little sacrifice on efficiency and improve the overall performance of propeller.PPTC-t2 propeller shows the best performance under heavy working condition,with an efficiency loss of 0.134%and a 24.6%volume reduction in cavitation area.Under the design condition,PPTC-t1 propeller delivers the best performance,with an efficiency loss of 0.284%and a 19.5%volume reduction in cavitation area.The reduced velocity around the control structures leads to localized high pressure and delays the occurrence of cavitation,thus realizing local regulation of cavitation flow field.This study proposes an effective way to ameliorate the cavitation of hydraulic machinery.
作者
赵伟
丁耀东
谭有为
李平
ZHAO Wei;DING Yaodong;TAN Youwei;LI Ping(MOE Key Laboratory of Thermo-Fluid Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2023年第2期141-150,共10页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51976152)。
