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효율적인 상세 반응 기구 해석을 위한 민감도 해석 기반의 부분 음해법
강기하(K.-H. Kang),문성영(S.-Y. Moon),노진현(J.-H. Noh),원수희(S.-H. Won),최정열(J.-Y. Choi) 한국연소학회 2008 한국연소학회지 Vol.13 No.1
A partly implicit/quasi-explicit method is introduced for the solution of detailed chemical kinetics with stiff source terms based on the standard fourth-order Runge-Kutta scheme. Present method solves implicitly only the stiff reaction rate equations, whereas the others explicitly. The stiff equations are selected based on the survey of the chemical Jaconian matrix and its Eigenvalues. As an application of the present method constant pressure combustion was analyzed by a detailed mechanism of hydrogen-air combustion with NOx chemistry. The sensitivity analysis reveals that only the 4 species in NOx chemistry has strong stiffness and should be solved implicitly among the 13 species. The implicit solution of the 4 species successfully predicts the entire process with same accuracy and efficiency at half the price.
환형 관내를 전파하는 데토네이션 파의 파면 구조 및 안정성
이수한(Lee S.-H.),조덕래(Cho D.-R.),노진현(Noh J.-H.),최정열(Choi J.-Y.) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Pre study examines the detonation wave propagation characteristics in annular channels. Numerical approaches used in the previous studies were extended with marching windows technique. Parametric study has been carried out using a radius of curvature normalized by the channel width considered as unique geometric parameter. In the channels of small radius of curvature, detonation wave is unstable and the regular cell structure is not observed. There is a critical radius of curvature where cell structure can be sustained. The effect of curvature makes the pressure difference on inner and outer surfaces where the detonation wave is overdriven, The results converge to that of straight channel as the radius of curvature gets larger, as expected.