Scramjet engine tracer PLIF multi-parameter distribution measurement device and method

Abstract

The invention provides a scramjet engine tracer PLIF multi-parameter distribution measurement device and a scramjet engine tracer PLIF multi-parameter distribution measurement method, and the scramjet engine tracer PLIF multi-parameter distribution measurement device is constructed. A plurality of CCD cameras are used for obtaining a tracer PLIF image when fuel injection conditions are simulated, a relation f (P) between a laser-induced fluorescence image intensity ratio I1 / I2 obtained through constant-temperature and variable-pressure image intensity calibration and pressure intensity P, and a relation f (T) between a laser-induced fluorescence image intensity ratio I3 / I4 obtained through constant-temperature and variable-pressure image intensity calibration and temperature T; the relation f (n) between the laser-induced fluorescence image intensity I5 obtained by calibrating the image intensity of the constant-pressure and constant-temperature variable component concentration and the tracer mass concentration n in the cavity is obtained, and the concentration, the pressure intensity and the temperature field quantitative distribution result of the jet fuel of the scramjet engine can be directly obtained. According to the invention, synchronous measurement of components, pressure intensity and a temperature field in the scramjet engine can be realized.

Description

technical field [0001] The invention relates to the technical field of scramjets, in particular to a scramjet tracing PLIF multi-parameter distribution measuring device and method. Background technique [0002] It is of great significance to realize the quantitative measurement of the injection fuel concentration, temperature and pressure field of the scramjet engine for revealing the fuel injection mixing and transportation process inside the engine and exploring the fuel mixing enhancement mechanism. The traditional gas analysis method can realize quantitative analysis of gas components and temperature after gas contact sampling, but this contact measurement method is limited by complex and severe engine experimental conditions (high speed, high turbulence), so its application scope is limited. At the same time, only single-point measurement can be performed. [0003] Laser-induced fluorescence (PLIF) technology based on molecular tracer is a relatively advanced measureme...

AI Technical Summary

Problems solved by technology

(1) The tracer PLIF signal is related to the component concentration, temperature and pressure, but the relationship between the tracer PLIF spectrum and the component concentration, temperature and pressure is not clear;

(2) The range of temperature and pressure in the test environment of the scram engine is relatively wide, and the post-calibration of the PLIF image is very important. At present, there is no tracer PLIF measurement and calibration method for this test environment

[0006] (3) The tracer PLIF post-calibration equipment is very important, but the existing calibration calibration equipment cannot meet the scramjet test conditions in terms of temperature and pressure settings

Images