端壁倒圆对小叶高叶栅气动特性的影响

Influence of fillet on aerodynamic characteristics of small blade height passage

采用数值模拟研究方法,结合工程加工及验收过程中的实际,开展了叶片端壁倒圆结构在典型工况下对小叶高叶栅气动特性的影响研究。结果表明:在倒圆半径不变的条件下,随着叶片高度的增加,小叶高叶片在相对叶高0.50~0.95区间内的能量损失显著减小,在叶片尾缘相对叶高0.70处低能尾迹的影响区域明显减少,流场马赫数均匀性更好。在叶片高度不变的条件下,随着倒圆半径的增大,小叶高叶栅通道出口质量流量呈加速减小趋势,通道中二次流强度出现提前增大现象,叶型总能量损失系数出现先减小后增大的变化趋势。

Analysis on the influence of fillet on the aerodynamic characteristics of small blade height passage under typical working conditions was carried out by numerical simulation combined with practice in processing and acceptance.The results show that with constant radius dimensions of the fillet,as the height of the blade increases,the energy loss of small blade height decreases significantly in the 0.50~0.95 range of relative blade height;at the trailing edge of the blade at a relative blade height of 0.70,the area affected by the low-energy wake was significantly reduced,and Mach number uniformity of flow field is better.With constant height of the blade,as the radius dimensions of the fillet increases,the mass flow rate at the outlet of the small blade height passage shows a tendency of rapid decrease;the secondary flow in the passage has increased in advance;the total energy loss coefficient of the blade profile decreased first and then increased.