叶片表面粗糙度对高负荷低压涡轮的流动影响

文章编号： 1007-2683（2019）02-0059-14

收稿日期： 2017-04-18

基金项目： 国家自然科学基金（51476134）.

作者简介：

乔渭阳（1963—），男，博士，教授;

白 濤（1988—），女，硕士.

通信作者：

张宗辰（1994—），男，硕士研究生，Email：744493714@qq.com.

Abstract：In order to get the effects of surface roughness on turbine profile loss in different working conditions， the flow of a frontloaded blade at different incidences and different Reynolds number was analyzed in detail by numerical simulation. The results show that when the incidence i=0° and 10°， there are no obvious separation on the blade surface. When i=20°， 25° and 30°， the boundary layer on blade surface are separated and the incidence is more serious. When the incidence is certain， the increasing of Reynolds number on the suppression of separation bubble appears to have a role in promoting; when the Reynolds number also is certain， increase the blade surface roughness of suppression of boundary layer separation have obvious effect， and Reynolds number greater suppression required to separate the roughness value is lower. When i=20° and the Reynolds number is 25000，50000，100000，150000，200000， the optimal roughness value of suppressing separation is 38mm，14mm，5.1mm，2.5mm，1.7mm， When i=25°， the optimal roughness value of suppressing separation is 230mm，50mm，11mm， 4mm，2.2mm to the same Reynolds number， When i=30° and the Reynolds number is 50000， 100000， 150000， 200000， the optimal roughness value of suppressing separation is 3200mm，800mm，120mm，29mm. Finally， a modal of optimal roughness vs. Reynolds number was built for suppressing separation in different incidences， and a C language program was written by the model. By using the program， the optimal roughness value of suppressing boundary layer separation can be calculated directly from the certain incidence and Reynolds number.