论文部分内容阅读
在吹风比Ｍ＝１．０和２．０的工况下，分别用五孔针和热电偶测量了流向倾角α为３０°和６０°、侧向倾角β为３０°和４５°以及喷孔出口扇形角γ为０°和３０°的复合角气膜冷却的流场和温度场，首次在实验中发现复合角射流下游存在一强一弱反向旋转的纵向耦合涡结构，其流向速度Ｕ／Ｕ∞和无因次温度θ的等值线均呈不对称腰子形。α、β、γ以及Ｍ的变化均将对流场和温度场产生影响。扇形孔射流具有较宽的气膜覆盖区域，能够有效地降低旋涡强度，具有比圆孔高得多的冷却效率。
In the case of blow ratio M = 1.0 and 2.0, the flow angles α and β were measured at 30 ° and 60 ° and 30 ° and 45 ° respectively with a five-hole needle and a thermocouple, For the first time, it is found that there exists a strong and weak reverse rotation of the longitudinal coupled vortex downstream of the composite angle jet. The velocity of flow U and its velocity U The contours of / U∞ and dimensionless temperature θ all show an asymmetrical kidney shape. Changes in α, β, γ, and M both affect the flow and temperature fields. Fan-shaped jets have a wide film coverage area, which can effectively reduce the vortex strength and have much higher cooling efficiency than the circular hole.