Tomography 이용 가상값 및 회전값 적용 비정형 화염 내 OH 라디칼 농도 분포 재구성
Tomographic Reconstruction of the Concentration Distribution of OH Radicals in an Irregularly Shaped Flame
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The concentration distribution of OH radicals in flame is a crucial factor that affects its structure, efficiency, and characteristics. In this study, the concentration of OH radicals in a premixed methane airflame was measured and reconstructed into a two-dimensional concentration distribution using several different computed tomography techniques. Severaldifferent metalfiber burners were used with both cylindricaland conical forms to produce an irregularly shaped flame. The heat load of the flame was 10,000 kcal/h with a lean fuelcondition at an equivalence ratio of 0.9. Laser lines with wavelengths of 1.34 and 1.49 ㎛ were crossed vertically in an 8×8 scanning system at rotating angles of 0, 30, and 45 degrees relative to a reference direction and reconstructedvia tomography at each angleto measure the concentration of OH radicals. The algebraic reconstruction technique (ART), multiplicative ART (MART), and simultaneous MART (SMART) algorithms were used to reconstruct the distribution of the concentration of OH radicals. We then compared the output of these methods with results obtained using an intensified charge-coupled device (ICCD) camera.
Abstract
The concentration distribution of OH radicals in flame is a crucial factor that affects its structure, efficiency, and characteristics. In this study, the concentration of OH radicals in a premixed methane airflame was measured and reconstructed into a two-dimensional concentration distribution using several different computed tomography techniques. Severaldifferent metalfiber burners were used with both cylindricaland conical forms to produce an irregularly shaped flame. The heat load of the flame was 10,000 kcal/h with a lean fuelcondition at an equivalence ratio of 0.9. Laser lines with wavelengths of 1.34 and 1.49 ㎛ were crossed vertically in an 8×8 scanning system at rotating angles of 0, 30, and 45 degrees relative to a reference direction and reconstructedvia tomography at each angleto measure the concentration of OH radicals. The algebraic reconstruction technique (ART), multiplicative ART (MART), and simultaneous MART (SMART) algorithms were used to reconstruct the distribution of the concentration of OH radicals. We then compared the output of these methods with results obtained using an intensified charge-coupled device (ICCD) camera.