基于RANS方法的导管推进器梢隙流动数值模拟  

Numerical simulation of the tip leakage flow in a ducted propulsor based on the RANS method

作　　者：阮华[1] 张志荣[1] 辛公正[1] 

机构地区：[1]中国船舶科学研究中心,江苏无锡214082

出　　处：《中国舰船研究》2015年第5期83-91,共9页Chinese Journal of Ship Research

摘　　要：以导管推进器为研究对象,采用雷诺时均纳维斯托克斯(RANS)方法对其梢隙流动进行数值模拟研究。通过对网格类型、湍流模型的适用性研究以及对梢部流场的研究探讨,初步建立了基于RANS梢隙流动的数值模拟方法;数值计算结果与实验结果吻合较好。对比分析发现,结构化网格与非结构化网格相比能捕捉到梢隙流动中更加细节的流场信息,如壁面边界层流动等,更适合于梢隙流动的数值模拟。3种湍流模型SST?k-ω,RNG?k-ε及RSM的计算结果基本一致,都能有效模拟梢隙流动。通过间隙区域流场分析发现,梢隙流动的驱动力主要是叶面与叶背之间的压差,受壁面边界层流动的影响。流体进入间隙时流动分离形成间隙分离涡,间隙泄漏流穿过间隙与吸力面侧流体相互作用,卷起形成梢隙涡,在约37.5%弦长位置处形成并附着在桨叶壁面发展,大约在75%弦长位置与桨叶分离进入尾流场中。研究获得了梢隙涡的起始、发展、脱落的变化过程。In this paper, a ducted propulsor is taken as the object of the research, where the RANS simulationmethod is used to study the tip leakage flow of the propulsor. Through the applicability study of the numericalgrid type and the turbulence model, and by analyzing the flow field at the tip region, preliminary numericalmethods based on RANS for tip leakage flow are finally proposed, and the corresponding results agree wellwith the experimental data. Through the comparison of unstructured and structured mesh＇s results, it is ob-served that structured mesh can capture more flowing detail（for example, the boundary flow）. Therefore,the structured mesh is more appropriate for the numerical simulation of tip leakage flow. Meanwhile, threeturbulence models, SST？k-ω, RNG？k-ε, and RSM are used, and their numerical results are essentiallysimilar, which suggests that all three can be applied in the tip leakage flow simulation. Through the analysisof tip clearance region＇s flow field, it is found that tip leakage flow＇s driving power is primary the pressure dif-ference between the front and back side of the rotor, and the flow is affected by the wall boundary flow.When the flow enters the tip gap, flow separation is occurred, and a gap separation vortex is formed. The tipclearance flow goes across the gap and interacts with the passage flow, finally developing into Tip LeakageVortex（TLV）. TLV＇s inception position is about 37.5% cord length and attaches to the rotor wall, and thensheds from the rotor wall at approximately 75% cord length into the wake flied. The numerical results clear-ly demonstrate the changing process of the tip leakage vortex inception, development, and shedding.

关 键 词：导管推进器 梢隙流动 网格类型 湍流模型 机理分析 

分 类 号：U661.1[交通运输工程—船舶及航道工程]