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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.780
pages 753-761

QUICK SPECTROSCOPIC DIAGNOSTICS FOR THE FLAME TEMPERATURE

Wenhua Zhao
Department of Engineering Mechanics, Tsinghua University, Beijing, China (100084)
Shuguang Zhu
Department of Engineering Mechanics, Tsinghua University, Beijing, China (100084)
Kuo Tian
Department of Engineering Mechanics, Tsinghua University, Beijing, China (100084)
Di Liu
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

ABSTRACT

A quick spectroscopic diagnostic system (see Figure 1) for the flame temperature is set up in this paper. It consists of optic imaging system, scanning system, dispersive system, photoelectricity conversion cell, operational amplifier, a computer-based data collection system, and data processing. The temperature profile varying with the time can be quickly measured with this system. The intensity of up to four spectral lines can be simultaneously measured.
The satisfied results have been obtained in measuring the temperature of two kinds of flame (the transparent optics-thin flame and the flame with enough solid particles) by the system.
1. The flame of coal powder: By analyzing the radiation characteristics of the flame of coal powder, a four- wavelength model is proposed in this paper to measure the flame temperature of coal powder. The model is that four equations are set up in four chosen wavelengths and the flame temperature can be obtained by solving the equation group. With the measurement system based on the model, in which the radiation of the combustion chamber surface and the scattering of the solid particles are consistently accounted for, the temperature of the flame can be quickly and accurately measured without a reference radiation source.
2. Thermal plasma: The temperature profiles varying with time for the nonsteady arc and flashover arc near the surface of a polluted plate are derived by employing the relative intensity method and the absolute intensity method.
3. Solid propellents: The spectrum for the flame of the solid propellants is measured. A lot of spectral lines are found in the spectrum of the flame, which are important information for temperature diagnosis.


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