Method and device for calculating infrared radiation characteristics of tail flame of solid rocket engine

The invention provides a method for calculating infrared radiation characteristics of tail flame of a solid rocket engine. The method comprises the steps of obtaining solid rocket engine outlet parameters and external flow field parameters; according to the engine outlet parameters and the external flow field parameters, the solid particle density and temperature of a plurality of space points in an external flow field along the axis of an engine outlet are calculated; interpolating the solid particle density and temperature of the plurality of spatial points in the external flow field by using a cubic spline function to obtain the density and temperature distribution of all solid particles in the external flow field; based on the density and temperature distribution of all the solid particles in the external flow field, radiation characteristics of all the solid particles in the total space area of the external flow field are obtained through calculation, so that infrared radiation characteristic distributio