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预旋喷嘴作为预旋系统中的重要元件,其性能优劣直接关系到预旋系统的温降效果。在保持喷嘴几何出气面积不变的条件下,对预旋角度为12°,无量纲叶高分别为0.12,0.25,0.5,1和2的叶型喷嘴在压比1.1~1.9范围内进行了数值模拟。计算域包含进气腔、预旋喷嘴和出气腔,研究内容包括速度场、出气速度、出气角度、流量系数和预旋效率。对比了直孔型喷嘴、扩口孔型喷嘴以及叶型喷嘴的性能差异。结果表明叶型喷嘴的流量系数和预旋效率比直孔型喷嘴均增大20%以上,预旋效率比扩口孔型喷嘴略微增大5%左右。叶型喷嘴的流量系数和预旋效率均随压比的增大而增大,随无量纲叶高的增大先增大后微弱减小;叶型喷嘴的无量纲叶高低于0.5时,流量系数和预旋效率将显著减小。
Pre-rotating nozzle as a pre-spin system, an important component, the merits of its performance directly related to pre-spin system temperature drop effect. Under the condition of keeping the geometric outlet area of the nozzle constant, for the pre-rotation angle of 12 ° and the non-dimensional leaf height of 0.12, 0.25, 0.5, 1 and 2, respectively, simulation. The computational domain includes the inlet chamber, the pre-rotating nozzle and the outlet chamber. The research contents include velocity field, exit velocity, exit angle, flow coefficient and pre-rotation efficiency. The differences between the performance of straight-hole nozzles, flared-hole nozzles and leaf-type nozzles are compared. The results show that the flow coefficient and prerotation efficiency of the airfoil nozzle increase by more than 20% compared with the straight nozzle, and the pre-spin efficiency increases slightly by 5% than that of the expanding nozzle. The flow coefficient and pre-spin efficiency of the airfoil nozzle both increase with the increase of the pressure ratio, increase first and then decrease slightly with the increase of the dimensionless leaf height. When the dimensionless leaf height of the airfoil nozzle is less than 0.5, the flow rate Coefficients and pre-spin efficiency will be significantly reduced.