表面粗糙度对跨音速叶栅流动特性的影响  

Effect of Surface Roughness on Flow Characteristics of Transonic Planar Cascade

作　　者：董中杰[1] DONG Zhong-jie(Heilongjiang Professional College,Harbin 150080,China)

机构地区：[1]黑龙江职业学院,哈尔滨150080

出　　处：《汽轮机技术》2025年第1期49-51,共3页Turbine Technology

摘　　要：针对汽轮机低压末级叶片表面粗糙度容易变大问题,利用数值模拟的方法分析了不同表面粗糙度对跨音速二维叶栅流动的影响。结果表明,粗糙度从0.025mm增大到0.20mm时,靠近叶片出汽边位置,内弧侧总压基本不变,而背弧侧低压区先扩大后减小,从而导致叶型损失先增大后减小,粗糙度0.10mm时,损失最大,这种变化规律是由于叶型喉部激波与背弧附面层干涉引起的附面层厚变化导致的。Aiming at the problem that the surface roughness of the last stage blade of steam turbine is easy to increase,the influence of different surface roughness on transonic two-dimensional cascade flow is analyzed by numerical simulation method.The results show that when the roughness increases from 0.025mm to 0.20mm,the total pressure on the pressure side near the trailing edge of the blade is almost unchanged,while the low pressure area on the suction side expands first and then decreases,resulting in the blade profile loss increasing first and then decreasing.When the roughness is 0.10mm,the loss is the largest.This change is due to the change of boundary layer thickness caused by the interference between the throat shock wave of the blade and the boundary layer of the suction side.

关 键 词：表面粗糙度 跨音速叶栅 叶型损失 变工况 

分 类 号：V21[航空宇航科学与技术—航空宇航推进理论与工程]