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가스터빈 연소기에서 운전 변수에 따른 희박예혼합 연소 특성 고찰
이재복(Jaebok Yi),정대로(Daero Joung),허강열(Kang Y. Huh),이민철(Minchul Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
This paper presents 3-D simulation results by STAR-CCM+ against measurements for lean premixed combustion in a stationary gas turbine with separated pilot and main nozzles. The cooling conditions by radiation and convection are adjusted to match the observed flame shape and exit temperature for the reference case. The PCFM involves propagation of a laminar premixed flame with the predicted flame surface density and the equilibrium assumption in the burned gas with spatial inhomogeneities. Parametric study is performed with respect to the ratio of pilot and total fuel. Results showed reasonable agreement with measured temperatures and consistent trends of variation with respect to the operating conditions in the tested ranges. The observed flame shape corresponds to the light emission from the diffusion flame out of the main nozzle. The predicted CO is based on the thermodynamic equilibrium assumption which led to a much higher level than measurements.
희박 예혼합 가스터빈 연소기 3 차원 전산 해석 및 화학반응기 네트워크에 의한 NOx 예측
이재복(Jaebok Yi),정대로(Daero Jeong),허강열(Kang Yul Huh),진재민(Jaemin Jin),박정규(Jungkyu Park),이민철(Min Chul Lee) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.12
희박예혼합 가스터빈 연소기에 대한 3 차원 RANS 해석을 수행하였으며 PCFM(Partially Premixed Coherent Flame Model) 화염면적밀도 생성항 상수의 보정을 통하여 희박연소조건을 모사하였다. PCFM 에서 계산된 화염면적밀도에 의해 층류 예혼합 화염의 전파를 예측하고 불균일하게 분포한 기연 가스의 물성을 평형 가정에 따라 예측하였다. 복사와 대류 열전달을 모사하기 위해 냉각 조건으로서 실험과의 비교를 통해 결정된 열유속을 적용하였다. 이러한 3 차원 해석 결과를 바탕으로 파일럿 노즐과 메인 노즐에 분배되는 연료량 비에 대한 민감도 조사를 수행하였으며 CRN(Chemical Reactor Network)을 구성하여 NOx 배출량을 예측하고 측정값과 비교 분석하였다. This paper presents 3D simulation by STAR-CCM+ for lean premixed combustion in a stationary gas turbine combustor with separate pilot and main nozzles. The constant for the source term in the flame area density transport equation was modified to account for a low global equivalence ratio and validated against measurement data. A Partially-premixed Coherent Flame Model(PCFM) involves propagation of a laminar premixed flame with the predicted flame surface density and equilibrium assumption in the burned gas with spatial inhomogeneity. The conditions for cooling by radiation and convection are considered for accurate determination of the heat flux on the wall. A parametric study is of the pilot-fuel-to-total-fuel-ratio is carried out. A chemical reactor network (CRN) was constructed on the basis of the 3D simulation results and compared against measurements of NOx.