secondary flow angle的意思|示意

The results show that the performance of optimized fan is improved by lowering the energy loss which caused by the secondary flow vortex, the volute tongue, the wake-jet and the angle of attack.

研究结果表明：通过优化有效降低了因二次流漩涡、风机蜗舌结构、尾流-射流和正冲角等造成的能量损失，提高了离心通风机性能。

Along with the increase of the secondary flow pressure ratio, the shock move toward upstream divergent section and the thrust vector angle gradually increases;

次流压比的增加将导致激波向扩张段上游移动，且喷管矢量角不断增加；