哈尔滨工程大学学报2016，Vol.37Issue(5)：646-652,7.DOI:10.11990/jheu.201501030
端壁相对运动对超声速膨胀器间隙流动的影响
Influence of relative motion of the end wall on tip clearance flow in a supersonic expander
摘要
Abstract
To reveal the effect of the relative motion of the end wall on the tip clearance flow of a supersonic expand⁃er, the three⁃dimensional Reynolds⁃averaged Navier⁃Stokes equations and the k⁃ε turbulent model were used to nu⁃merically simulate the tip⁃clearance flow. Relative motion between the strake wall and casing was considered at differ⁃ent speeds. The simulation results show that the loss due to mixing of the leakage flow, mainstream flow, and bounda⁃ry layer is the main source of loss in the clearance zone of a supersonic expander. The flow loss at the suction⁃surface zone near the separation line is maximum, but the flow loss near the pressure surface is lower beside the trailing edge. It would be expected that the viscous shear force be weakened due to relative stagnation between the strake wall and the casing, but the effect of the end wall has a significant impact on the clearance flow. When relative motion of the end wall exists, transverse motion of the leakage vortex is inhibited, the separation line approaches the suction sur⁃face, and the tip⁃leakage flow increases. The mixing process of the leakage flow, mainstream flow, and end⁃wall boundary layer is significant. The migration, subsurface flow, and friction of the low⁃energy fluid within the boundary layer are also intense. The efficiency of the supersonic expander decreases due to an increase in the total loss in the three⁃dimensional flow passage.关键词
超声速膨胀器/隔板/机匣/相对运动/间隙流动Key words
supersonic expander/strake wall/casing/relative motion/tip clearance flow分类
建筑与水利引用本文复制引用
黄振宇,钟兢军,杨凌,韩吉昂..端壁相对运动对超声速膨胀器间隙流动的影响[J].哈尔滨工程大学学报,2016,37(5):646-652,7.基金项目
辽宁省高校创新团队支持计划（ LT2015004）；高等学校博士学科点专项科研基金资助项目（20132125120006）． （）
