粗糙度对层板结构扰流柱换热特性影响  

Influence of roughness on heat transfer of pin-fin with lamilloy structure

作　　者：李广超[1] 蒋蔚[1] 刘永泉[2] 张魏[1] 寇志海[1] 

机构地区：[1]沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室,辽宁沈阳110136 [2]中国航空发动机集团沈阳发动机设计研究所,辽宁沈阳110015

出　　处：《热力发电》2017年第5期80-85,共6页Thermal Power Generation

基　　金：国家自然科学基金项目(51406124);辽宁省自然科学基金项目(2015020112)~~

摘　　要：为了探讨精密铸造涡轮叶片内部表面粗糙度对扰流柱换热特性的影响,在冲击雷诺数Re为1×10~4~5×10~4下,数值模拟了粗糙度分别为0、10、20、30μm的典型层板结构内扰流柱表面换热系数。结果表明:粗糙度对扰流柱表面换热系数的影响主要集中在迎风面上;粗糙度增加使扰流柱表面平均换热系数增大;Re越大,粗糙度对换热系数的影响越明显,Re从1×10~4增加到5×10~4,粗糙度为30μm的平均换热系数相比于光滑扰流柱面提高了13%~134%。To investigate the effects of internal surface roughness of precision casting turbine blade on heat transfer of pin-fin with lamiUoy structure, the heat transfer coefficient of the pin in typical lamilloy were simulated, with internal surface roughness of 0 μm, 10 μm, 20 μm and 30 μm, at Reynolds number range from 1 × 10^4 to 5 × 10^4. The results show that, the influence of the internal surface roughness on heat transfer of the pin-fin mostly concentrates on the windward side. The average heat transfer coefficient on the pin increases with the surface roughness, and this influence becomes more obvious as the Reynolds number increases. When the Reynolds number varies from 1 × 10^4 to 5× 10^4, the area-averaged heat transfer coefficient on the pin-fin with internal surface roughness of 30 jxm are 13% to 134% higher than that on the smooth pin.

关 键 词：层板 扰流柱 迎风面 背风面 粗糙度 冲击雷诺数 换热特性 数值模拟 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]