Source flow equation inverse function calculation method and supersonic velocity spray pipe profile calculation method thereof

The invention discloses a source flow equation inverse function calculation method and a supersonic velocity nozzle profile calculation method thereof. The supersonic velocity spray pipe profile calculation method comprises the following steps: determining boundary conditions, and determining initial values of a throat curvature and an expansion section angle; performing cubic curve calculation based on a source flow equation inverse function calculation method to obtain ME and MB; performing curve calculation for four times based on ME and MB to obtain xE and xC; 5-time curve calculation is carried out based on ME, MB, xE and xC, a 5-time curve profile is obtained, and boundary layer correction is carried out; and performing CFD verification on the corrected molded surface, if the quality of the flow field does not reach the standard, updating the angle of the expansion section and/or the throat curvature, and repeating the steps until the quality of the flow field reaches the standard. According to the meth