Research And Appliance Of Liquid Rocket Engine Feather Flame Spectrum Data Acquisition System

The detection technology of plume spectroscopy as a new sensor technology has shown up prominently in the field of aerospace technology in our country. An non-contacting engine diagnosis means is very important for the engine test. When the liquid rocket engine components have the phenomenon of wear, ablation, the parts which were lost would flow into the high temperature fire with a plume.In this thesis the related theory and a lot of testing data show that the strength of the metal elements' spectrum characteristics in the flame has a closely relation with the concentration of plume, and the concentration of metal elements in the fire plume depends on the wear degree of engine components. So it can judge the working state of the engine by monitoring the engine plume spectrum. In this thesis, we design and integration of the acquisition system to achieve the mach aimed of the feather flame, the real time spectral data collection and the transmission control function. We develop the software to identification the characteristic spectrum of metal elements by ourselves. After calibration, we achieve the system's feasibility and reliability by the verification experiment and the engine ground ignition test. All of this based on simulation results of plume in liquid rocket engine failure.Using the system, we make many liquid rocket engine ground tests and launch tests. And we achieve a real-time data acquisition of the engine feather flame spectrum and get many spectral data. Through the characteristics extracted spectrum, we detect related metal atoms of element. The analysis results of working conditions show that the flame spectrum has a certain relation with engine condition and malfunction. According to this relationship, we can achieve real-time monitoring of the working conditions, and have a new basis for the engine malfunction detection and diagnosis.