Asymmetric trapezoid-like nozzle throat design method

The invention discloses an asymmetric trapezoid-like nozzle throat design method, which comprises the following steps of: firstly, setting the center of an asymmetric trapezoid-like nozzle throat as a coordinate origin, setting an XY plane as a design surface, and determining the throat area of the asymmetric trapezoidal spray pipe according to the total pressure recovery coefficient at the throat of the asymmetric trapezoidal spray pipe, the total pressure recovery coefficient at the throat of the original spray pipe of the engine matched with the asymmetric trapezoidal spray pipe and the throat area; drawing a right-angled inverted trapezoid, carrying out four-corner modification by using a quadratic curve, preliminarily determining the shape of the throat, and preliminarily solving the height of the right-angled inverted trapezoid and the lengths of the upper and lower bottom edges according to the distribution width-to-height ratio of the asymmetric spray pipe at the throat, the inclined edge inclination