Experimental Study Of High Temperature Non-equilibrium Gas Optical Radiation Effect On Shock Tube

The gas behind shock wave,which is in thermodynamics and chemical nonequilibrium state,is important light source.The optical radiation of the gas contains a large amount of information.It is very important to study high temperature nonequilibrium gas optical radiation.This thesis conducts an experimental study on the radiation effect of high temperature non-equilibrium air behind shock waves.The main content of this thesis are as follows:(1)For measuring the spectral distribution of different positions in the direction of shock wave movement,a spatial resolution spectral measurement method based on imaging lens,spectrometer and detector has been designed.For measuring the spectral history of shock wave passing through the test window at different moments,a timeresolved spectrometric measurement method based on spectrograph and streak camera has been designed.(2)The test of optical radiation measurement of high temperature non-equilibrium air behind shock waves on the shock tube has been carried out.Spatially resolved spectroscopy,time-resolved spectroscopy and optical radiation intensity has been measured.The weak signal measurement problem for transient processes and high speed trigger control problem has been solved.The effective test data have been obtained.(3)The calibration scheme and the computing method of optical radiation intensity,time-resolved spectroscopy and spatially resolved spectroscopy have been determined by analysis.The related principle and results have been given.The computing method of vibration temperature variation after shock waves have been introduced.The results of time-resolved spectroscopy and spatially resolved spectroscopy have been analyzed and discussed.The spectral distribution of gas at different positions behind the shock wave can be obtained by both spatial resolution spectral measurement method and time-resolved spectrometric measurement method.The results of the two methods are consistent,which confirms the feasibility of the two methods.This thesis can provide data support for the study of the non-equilibrium mechanism of gas behind the shock wave.