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복사 데이터베이스를 이용한 노즐 출구에서의 스펙트럼 예측
남현재(H.J. Nam),권오준(O.J. Kwon) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Numerical simulations of thermal emission spectra at rocket nozzle exit were performed by using a line-by-line radiation model. In the present study, it was assumed that rocket plume consists of only H<SUB>2</SUB>O and CO<SUB>2</SUB> molecules. The most up-to-date high resolution radiation database, HITEMP2010, was used to obtain the absorption coefficients of the two molecules. The effect of collisional broadening was taken into account so that spectral lines are broadened in the shape of Lorentzian line profile. Spectral emissivity and emissive power were calculated and compared with experimental measurements and other numerical simulation results. Each spectrum of H<SUB>2</SUB>O and CO<SUB>2</SUB> molecules agreed well with other observed spectra and the calculated spectra of the mixture of the two molecules were also agreed well with other numerical results. A spectrum prediction at nozzle exit under a flowing condition was made in the wavelength range of 2 to 10 μm. The result showed good agreement with experimental data but it was slightly underpredicted at the wavelength of 3.5, 4.7 and 5.3 μm. One possible reason for the underprediction at certain wavelengths may be due to the absence of emission of diatomic molecules.