【作者】 张凌新； 陈明； 邹奥东； 邵雪明；

【Author】 ZHANG Ling-xin;CHEN Ming;ZOU Ao-dong;SHAO Xue-ming;State Key Laboratory of Fluid Power Transmission and Control,Department of Mechanics,Zhejiang University;

【机构】 流体动力与机电系统国家重点实验室力学系浙江大学；

【摘要】 本研究针对径向射流流场,建立了数值计算模型,通过数值方面的研究,为建立空蚀试验台提供技术参考。数值计算了不同工况下的空化流场,研究了空化的发生位置、空化长度以及回射流的特征,结果表明,从空化数0.8左右开始出现空化,最初产生的空化并非片状空化,而是集中在分离区尾部的涡空化,随着空化数的减小,出现附着于壁面的片空化,在回射流的作用下,空泡具有强烈的振荡过程。空化区长度随着空化数的降低不断增长,空化长度与空化数近似成线性关系。更多还原

【Abstract】 For establishing experimental platform on cavitation erosion,the numerical modeling and simulations of radical-jet cavitation are performed.By simulating the cavitation flow field at different conditions,the position of cavitation,cavity length and re-entrant jet are investigated.The results show that the cavitation inception occurs at cavitation number about 0.8.Vortex cavitation,instead of partial cavitation,is observed at the tail part of separation region.Partial cavitation attached on the wall occurs as the cavitation number decreases.It presents intense vibration due to the re-entrant jet.The cavity length becomes larger with the decreasing of cavitation number,showing nearly a linear relationship with the cavitation number.更多还原