泵喷推进器非定常空化性能数值模拟分析  

Numerical Simulation Analysis of Unsteady Cavitation Performance of a Pump-jet Propulsor

作　　者：鹿麟[1,2] 潘光[1,2] 

机构地区：[1]西北工业大学航海学院 [2]水下航行器研究所,西安710072

出　　处：《上海交通大学学报》2015年第2期262-268,共7页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(51279165);国防基础研究项目(B2720132014)资助

摘　　要：基于均质多相流的RANS(Reynolds Averaged Navier-Stokes)方程,采用分块网格技术生成高质量结构化网格,同时结合剪切应力SST(Shear Stress Transport)k-ω湍流模型和Z-G-B(Zwart-Gerber-Belamri)空化模型以对NACA66翼型进行了定常流空化性能数值模拟,数值计算结果与实验值吻合良好,验证了数值计算法的实用性与可靠性.在此基础上,利用URANS(Unsteady Reynolds Averaged Navier-Stokes)方程和滑移网格技术,对装有泵喷推进器的无人水下航行器(Unmanned Underwater Vehicle,UUV)进行了非定常流空化性能数值模拟与分析.计算结果表明,数值模拟可以较为精确地预测泵喷推进器空化现象的起始与发展、形状与位置等特性;空化现象发生时,泵喷推进器效率出现明显的降低且达到20%以上;UUV表面与定转子叶片的压力分布较为合理,与空化现象吻合;转子叶顶区域压力面与吸力面之间的压差引起了顶隙梢涡与顶隙空化,造成了泵喷推进器效率进一步的损耗.The steady cavitating flows of NACA66 hydrofoil were investigated numerically based on the RANS equations of homogeneous multiphase using high quality multi-block structure grid, combined with SST k-ω turbulence model and Z-G-B cavitation model. Numerical simulation results are in good agree- ment with the experimental data. Consequently, it is indicated that the numerical simulation method is ap plicable and reliable. Furthermore, URANS equations and sliding mesh method were applied to the numerical predictions of unsteady cavitation performance for pump-jet propulsor on UUV. The results show that the numerical simulations accurately predict the cavitation inception and extension, shape and location. When cavitation phenomenon appears, the efficiency of pump-jet propulsor drops significantly, even up to more 20%. The obtained pressure distributions of UUV surface, rotor and stator blades are reasonable and consistent with the cavitation phenomenon. Additionally, the pressure difference of pressure side and suction side of rotor blade causes tip vortex and tip clearance cavitation, which result in a further drop in efficiency of pump-jet propulsor.

关 键 词：泵喷推进器 非定常流空化性能 顶隙梢涡 顶隙空化 数值模拟 

分 类 号：U661.1[交通运输工程—船舶及航道工程]