Design method for variable-geometry asymmetric spray pipe of coupling rocket thrust chamber

The invention discloses a design method of a variable geometry asymmetric nozzle coupled with a rocket thrust chamber. The design method comprises the steps that a variable geometry three-dimensional asymmetric nozzle is designed based on a streamline tracking technology; designing a rocket thrust chamber three-dimensional model based on a characteristic line method; the invention relates to a coupling method design of a rocket thrust chamber and a three-dimensional asymmetric nozzle. The three rocket thrust chambers are installed on the upper expansion face of the three-dimensional asymmetric spray pipe, and the thrust performance of the three-dimensional asymmetric spray pipe under the low Mach number is improved through high-energy jet flow provided by the rocket thrust chambers; through effective combination of the rocket thrust chamber and the asymmetric nozzle, high-performance work of the asymmetric nozzle in a wide speed range is guaranteed, and the use requirements of an engine and an aircraft are be