基于壁模化大涡数值模拟的喷水推进泵内湍流运动特性分析  

Analysis of the Turbulent Properties of Flow in Water-jet Pump Based on Wall-modeled Large-eddy Simulations

作　　者：许辉 陈作钢[1,2] 蔡佑林[3] XU Hui;CHEN Zuogang;CAI Youlin(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;School of Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Science and Technology on Water Jet Propulsion Laboratory,Marine Design&Research Institute of China,Shanghai 200011,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]上海交通大学船舶海洋与建筑工程学院,上海200240 [3]中国船舶及海洋工程设计研究院,上海200011

出　　处：《兵工学报》2024年第S02期55-64,共10页Acta Armamentarii

摘　　要：尺度解析类数值模拟方法具有很高的非定常流动预报潜力,其中壁模化大涡数值模拟(Wall-modeled Large-eddy Simulation,WMLES)方法在高雷诺数下具有适用范围广、计算成本较低等优势但在喷水推进泵的数值模拟中应用有限。采用基于湍流场特征尺度分析的WMLES方法进行原型喷水推进泵及改型喷水推进泵的泵内流场数值模拟并与试验数据进行对比。结果显示,WMLES预报的两型喷水推进泵的扬程及转矩等外特性特征都与试验数据吻合极好。从泵内湍流运动特性分析的角度,WMLES方法再现了传统RANS(Reynolds-Averaged Navier-Stokes)方法难以获得的导边马蹄涡、随边角涡、叶梢集中涡、间隙泄漏涡等精细流动特征。在相同流量系数下,改型泵的马蹄涡、角涡等二次流强度明显小于原型泵,改型泵的平均极限流线也明显更为光顺,更低的能量耗散使得改型泵的工作效率相比原型泵有明显提升。分析结果证明,基于湍流场特征尺度分析的WMLES方法可用于喷水推进泵的外特性及泵内湍流运动特性的有效预报,为喷水推进泵的改进设计提供了有力的数据支撑。Scale-resolving simulations are potential for accurate predictions of unsteady flows.Wall-modeled large-eddy simulation(WMLES)has the advantages of wide application and relatively low computational cost.However,the application of WMLES to the turbulent flow in water-jet pump is limited.The WMLES based on the analysis of turbulent length scales is applied to simulate the flow fields in a prototype pump and a modified pump,and the simulated results are compared to the experimental results.The head rise and torque coefficients predicted by the WMLES agreed well with the experimental data.The analysis of the turbulent properties of flows in the pumps demonstrate that the WMLES is capable of reproducing the horseshoe vortices,corner vortices,tip concentrating vortices and tip leakage vortices that are difficult for the conventional Reynolds-Averaged Navier-Stokes(RANS)method to reproduce.The horseshoe and corner vortices of the modified pump are much weaker than those of the prototype pump,and the limiting streamlines of the modified pump are smoother that those of the prototype pump.The lower dissipation of energy caused by the weaker vortices led to the higher efficiency of the modified pump.The results demonstrated that the WMLES based on the analysis of turbulent length scales could be effectively applied to predict the performance and turbulent properties of flow in the water-jet pump,which can provide the data support for the improvement of water-jet pump.

关 键 词：大涡数值模拟 壁模化方法 湍流特征尺度 喷水推进泵 非定常流 

分 类 号：U661.1[交通运输工程—船舶及航道工程]