Based on the theory of parallel compressor

the calculation method of the influence of actual combined distortion on the engine was studied with the temperature and pressure distortion generated by the steam suction as boundary conditions. The unsteady two-dimensional inviscid integral Euler’s equations were used. While the distortion intensity

the high temperature range

and the low pressure range were kept the same

the regularized equivalent conversion of the distortion contour maps was performed. And the temperature and pressure distortion contour maps were coordinated

so that these two could be superimposed on each other. Results showed that when the number of circumferential sub-engines was greater than 2

the number of sub-engines had little effect on the calculation results. The influence of combined distortion on the fan and compressor pressure ratio was the same as the single pressure distortion. Compared with the experimental thrust loss

the equivalent regularization transformation of the distortion map can be used for the calculation of the actual combined distortion.