摘要
采用数值手段探讨船用螺旋桨发生空化时其推力出现下降的机理.基于均质混合流模型和Schnerr-Sauer空化模型,以PPTC(potsdam propeller test case)桨为对象,数值模拟了其在不同空泡数下的空化流场,并将计算结果与试验结果进行了比较和分析,对计算网格和数值方法进行了有效性验证.随后数值模拟了该桨在不同进速系数下的空化流场,并与无空化流场计算结果进行了比较.结果表明:空化发生进而造成螺旋桨推力下降主要有两个原因:①空化发生区域的压力始终等于汽化压力,阻碍了该区域负压谷值的降低;②空化发生时改变了无空化区域的压力分布.随着进速系数增加,推力下降的主要原因逐渐由第一点向第二点转变.
Based on the homogeneous mixed flow model and Schnerr-Sauer cavitation model,the cavitation flow field of PPTC(potsdam propeller test case)propeller with different cavitation numbers was numerically simulated,and the calculated results were compared with the experimental results.The computational mesh and numerical method were validated.The cavitation flow field of the propeller with different velocity coefficients was numerically simulated,and the results were compared with those of the non-cavitation flow field.The results show that there are two main reasons for the decrease of propeller thrust caused by cavitation:①The pressure in the cavitation area is always equal to the vaporization pressure,which hinders the reduction of the negative pressure valley in this area.②Cavitation changes the pressure distribution in the cavitation-free area.With the increase of the feed rate coefficient,the main reason for the decrease of thrust gradually changes from the first point to the second point.
作者
刘谦
李子如
何朋朋
贺伟
LIU Qian;LI Ziru;HE Pengpeng;HE Wei(Key Laboratory of High Performance Ship Technology,Wuhan University of Technology,Wuhan 430063,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China)
出处
《武汉理工大学学报（交通科学与工程版）》
2022年第6期1013-1019,共7页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家自然科学基金重点国际合作研究项目(51720105011)、领域基金重点课题(61402070105)。
关键词
螺旋桨
空化
推力损失
数值模拟
marine propeller
cavitation
thrust reduction
numerical simulation
