论文部分内容阅读
为了进一步理解双出口气膜孔的冷却特性,建立了气膜冷却效率实验台,通过红外测温技术研究了圆孔和4个不同次孔方位角的双出口孔在吹风比为0.3~2.0时的冷却效率.结果表明:和圆孔相比,次孔方位角为30°,45°,60°双出口孔能提高面平均冷却效率18%~37%.次孔方位角为30°双出口孔在低吹风比下提高冷却效率最显著,次孔方位角为60°双出口孔在高吹风比下提高冷却效率最显著.在研究的吹风比范围内,次孔方位角为45°双出口孔都能较显著地提高冷却效率,次孔方位角为75°双出口孔冷却效率低于圆孔冷却效率.
In order to further understand the cooling characteristics of double-outlet gas-membrane pores, a test bench for gas-film cooling efficiency was established. The infrared outlet temperature was used to study the effects of double-outlet holes with four holes and four sub-apertures. The results show that the average aperture cooling efficiency is 18% ~ 37% when the azimuth angles of the sub-holes are 30 °, 45 ° and 60 °, and the outlet of the sub-holes is 30 °. The hole has the most remarkable cooling efficiency at low blowing ratio and the sub-aperture azimuth is 60 °. The double outlet hole has the most remarkable cooling efficiency at high blowing ratio. In the studied blowing ratio range, the sub-hole azimuth is 45 ° double outlet Holes can significantly improve the cooling efficiency, secondary hole azimuth of 75 ° double outlet hole cooling efficiency is lower than the circular hole cooling efficiency.