Experimental Analysis of lean premixed natural gas-air high swirl flame chemiluminescence and flame spectrum in visible wavelengths

Publish Year: 1398
نوع سند: مقاله کنفرانسی
زبان: English
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CCI08_031

تاریخ نمایه سازی: 19 اسفند 1399

Abstract:

According to necessity of measuring combustionparameters of a combustion system such as gas turbinesusing simple and practical methods, in this paper,chemiluminescence of lean premixed natural gas-air highswirl flame of a high swirl burner which is a prevalentburner for gas turbines is analyzed. Visible wavelengthrange of the spectrum is then compared with flame color,using flame image processing and study of RGBcomponents of flame image, especially for excitedspecies such as CH* and C2*. Results are analyzed atatmospheric pressure condition, equivalence ratio rangeof 0.4 to 0.8 (lean state), nominal power of 21 kW andswirl number of 0.69. The results from spectroscopyshow that because of gaseous lean premixed combustion,chemiluminescence intensities of excited species aremuch smaller in visible wavelengths. Also in mentionedequivalence ratio range, reaction zone average intensitiesof CH* and C2* chemiluminescence have the same trendof total reaction zone average intensities of blue andgreen color respectively. In the end, a fourth-orderpolynomial was introduced to obtain reaction zoneaverage intensities of CH* and C2* chemiluminescence,using blue and green color intensities respectively andthis can be done only by using a digital camera

Authors

Morteza Nahvi

Graduate Student, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

Kiumars Mazaheri

Professor, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

Amirreza Mohammadpour

Ph.D. Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

Mohammad mahdi Parsafar

Graduate Student, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran