Research on flow and infrared radiation characteristics unsteady plume in atmospheric environment

Abstract

The engine plume is a kind of high-temperature, high-pressure gas, which emits a strong infrared signal, and is widely used in target detection and recognition. This paper takes a liquid rocket engine as the research object, and uses the unsteady Navier-Stokes equation to simulate the working process from engine ignition to stable combustion. Based on the calculation results of plume flow field, the infrared radiation characteristics of the unsteady working process are calculated by the line-by-line integration method and the light of sight method. The time scale of the engine from ignition to stable combustion is very small, and at the same time, the radiation brightness distribution and the radiation intensity distribution in the process are given.