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

关键词:  射流冲击  强化换热  防冰  进口支板  瞬态测温

Key words:  Jets impingement  Heat transfer enhancement  Anti-icing  Inlet strut  Transient temperature measurement

摘要:

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。

Abstract:

In order to obtain the heat transfer characteristics for impingement of a strut in aero engine inlet，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 Nusselt(Nu) number distribution were studied with the jet Reynolds number range from 6.3×103 to 15.9×103 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°.