The Flame Temperature Distribution Measurement Of Solid Propellants

A quick spectroscopic diagnostic system for the flame temperature is set up in this paper. It consists of an optic imaging system, a scanning system, a dispersive system, a photoelectricity conversion cell, operational amplifiers, a computer-based data collection system and a data processing. The temperature profile varying with the time can be quickly measured by this system. The intensity of up to four spectral lines can be simultaneously measured.The flame temperature distribution in the axial direction of solid propellants is measured using the spectroscopic diagnostic system. The chemical reactions in the flame area are very complex. It is very difficult to measure the number density distribution of the particles (atoms, ions and molecules), so the relative intensity method is employed. Three nitrogen ion spectrum lines are used in the measurement. Two of them are very close, so that they are difficult to distinguish. The relative intensity method is adjusted to deal with this case. The measurement of the temperature distribution based on this improved method is successful, and the measurement results are compared with the results of the thermocouple method.