基于RANS方法超空泡流数值计算方法研究  

Supercavitation Research on Numerical Simulation Method Based on Two-Equation RANS Model

作　　者：杜佩佩[1] 肖昌润[1] 张露[1] 郑文龙[1] 焦玉超[1] 

机构地区：[1]海军工程大学舰船工程系,武汉430033

出　　处：《兵器装备工程学报》2016年第10期174-180,共7页Journal of Ordnance Equipment Engineering

基　　金：国家部委基金资助项目(51314010203)

摘　　要：为了得到超空泡流准确的数值计算方法,基于乌克兰国家科学院IHM的空泡形态计算经验公式与Logvinovich空泡截面独立扩张原理,利用数值优化的方法,建立了空泡形态计算模型;采用有限体积法验证了超空泡流的数值离散方法,对不同空化数下,5种两方程RANS模型进行了数值计算,数值计算结果与基于经验公式的空泡验证模型比较表明:Kω-Sst模型相比其他两方程RANS模型准确度更高,关于空泡最大截面直径的无量纲计算误差小于14%;对空泡长度的数值计算误差小于8%,空化数小于0.01时,小于4%。基于建立的准确数值计算模型,对空化数为0.015时超空泡航行体进行了流场特性数值计算。结果表明:由于空化器锐缘影响,在空化器后部形成了高速气流区域并且存在明显的速度梯度,艏部空化器附近承受静水压力达123个大气压。基于数值计算结果,为超空泡航行体设计提供了改进意见。In order to get the accurate numerical simulation method,the calculation model of supercavity shape was established based on the semi-empircal formula of supercavity form in Institute of Hydromechanics of National Academy of Science in Ukraine and the Logvinovich principle of independent expansion of cavity section. By using the finite volume method,the nelerical discretization method of supercavitation flow was authenticated and the supercavitation flow with five different two-equation RANS model was calculated in different cavitation number. The simulated results indicate that the accuracy of the calculation results of Kω-Sst is higher compared with other models. The complutational error of the dimensionless maximum diameter of the supercavity can be maintained at less than 14%. And the calculation error of the cavity length can be reduced to less than 8% and the error can be futher reduced to4% when the cavitation number is less than 0. 01. Based on the established mathematical model,the flow performance of the supercavitation vehicle was calculated when the cavitation number is 0. 015. Thecomputed and analyzed results show that： there is a high-speed air flow area and obvious velocity gradients behind the cavitator. Hydrostatic pressure in the vicinity of cavitator can reach 123 atomosphere pressures and the improvement of the design of the supercavitation vehicle is proposed based on these calculation results.

关 键 词：超空泡 湍流模型 有限体积法 CFD 

分 类 号：TJ610.1[兵器科学与技术—武器系统与运用工程]