楔形通道内带角度射流冲击换热特性研究

Study of Heat Transfer Characteristics under Different Jet Angels in a Wedge Channel

为了获得某型发动机支板内通道冲击射流的换热特性,采用热色液晶全表面瞬态测温技术对楔形通道内表面进行换热实验。研究了射流雷诺数、射流角度和出口缝的位置对努塞尔数的分布和大小的影响。射流雷诺数的变化范围是6.3×103~15.9×103,射流角度的变化为0~30°。研究表明:射流雷诺数的增加,射流角度的增大均会使得平均换热效果增强。在射流角度0~15°内,出口缝离射流入口越近,壁面换热越强。射流斜吹情况下,被冲击面的努塞尔数要高于未被冲击面。其中,射流角度30°时换热的不对称性最显著。在射流角度为15°时,支板前缘的换热效果最强。

In order to obtain the heat transfer characteristics for impingement of a strut in aero engine in- let, experiments were carried out with the use of transient thermochromic liquid crystal measurement technique in a wedge channel. The effects of jet Reynolds number, jet angle and position of outlet slot on Nusseh （Nu） number distribution were studied with the jet Reynolds number range from 6.3 × 10^3 to 15.9 × 10^3 and jet angle from 0° to 30°. The results show that the average heat transfer in the wedge channel was enhanced with the increasing Reynolds number and jet angle. The wall has a greater heat transfer when the slot near impingement inlet with the jet angle range from 0° to 15°. The Nu number of two sides of the wedge channel is asymmetric under the condition that jet angle is not vertical. When the jet angel is 30°, the nonuniform is the most obvious. The Nu number is the highest at leading edge when the jet angel is 15°.