The Real Time And In Situ Infrared Characteristics Measurement Of Plume Of Solid Rocket Propellant By Remote Sensing FTIR

The plume at the missile tail with radiation and smoke are composed by burning and analyte products discharged from nozzle which maybe make the missile fail. The smoke and plume will expose the sending spot and the position of itself. It is a hotspot to study the combustion characteristics of the plume of propellant.Fourier Transform Infrared Spectroscopy can achieve remote detection and has been an important test method in recent ten years. It can gain the plume information such as the temperature, the combustion products and the radiation energy distribution simultaneously which make great significance in studying the combustion condition of propellant, modifying the engine and the prescription, infrared guide and anti-guide. It also acts as a special role in developing space technique and show the tremendous vitality.In this paper, the Fourier Transform Infrared Spectroscopy has been used to detect the plume of solid propellant in combustion process real time and originally. The infrared spectra been recorded can be calculated to gain the absolute radiation energy, temperature of plume and the information about the kind of gas. Then, transmittance data were obtained as well as the pressure of ballistic trajectory by the corresponding test system.This thesis includes two parts. Part one is review. Part two is research report.Part 1 ReviewCombustion condition and the form of plume of propellant in combustion has been introduced. The test methods of solid propellant and the application of FTIR to the test of radiation energy, to gas concentration analysis and to the calculation of plume temperature of propellant with gas fine structure were reviewed in detail.Part 2 Research Report2.1 The measurement of radiation energy of solid rocket propellant in combustion by remote sensing FTIRThe plumes of solid rocket propellants were studied by remote sensing FTIRspectroscopy. The radiance spectras of seven kinds of propellant and a infrared active reagent in the wavenumber range of 700 to 4500cm-1 at different resolution were recorded. The curves of change in the radiation energy were obtained by integrating the radiance between 2000cm-1 ~3333cm-1. The results show that remote sensing FTIR can detect the acute and unstable combustion flame real time and continuously without interfere.2.2 The measurement of temperature of solid propellant plume by remote sensing FTIRThe infrared radiance spectra was obtained by remote sensing FTIR. The temperatures of four plumes of propellants and a infrared reagent were calculated according to the gas vibration rotation band fine structure such as CO, HF, H2O and HC1 in plume of solid rocket propellant. The results have a agreement with the theoretical data. Results show that remote sensing FTIR testing technique can be used to gain the temperature of plume of propellants.2.3 The characteristic signal testing of plume of solid propellantIn this paper, the characteristic signals of plume of two kinds of solid propellants were tested. The transmittance in visible and infrared and ultraviolet area and the infrared image was recorded. The changes of pressure in ballistic trajectory were studied, too. The information about characteristic signal of propellant was obtained by these results.