基于火焰面和射流模型的双模态冲压燃烧室一维性能计算

One-Dimensional Performance Calculation of Dual Mode Scramjet Combustor Based on Flamelets and Jet Model

关键词:  火焰面模型  射流模型  预燃激波串  FlameMaster  一维性能计算

Key words:  Flamelets model  Jet model  Pre-combustion shock train  FlameMaster  One-dimensional performance calculation

摘要:

为了快速地得到双模态燃烧室中的参数分布，采用射流模型，获得燃料混合分数的时均值、脉动值以及当量标量耗散率的时均值在双模态冲压发动机燃烧室中的三维分布；采用火焰面模型得到燃烧组分和释热分布，将三维信息通过流道横截面面积平均加入到一维非稳态计算模型，求解流动控制方程得到双模态燃烧室一维参数分布。通过不同类型算例验证，表明该方法能较准确地预测燃烧内壁面压力的变化趋势，克服了燃料射流非一维因素对一维计算方法带来的不利影响。

Abstract:

A one-dimensional analysis code coupled with the flamelets model was established to rapidly obtain the parameter distribution in a dual-mode scramjet combustor. A jet model was used to acquire the three-dimensional distribution of the time averaged and fluctuating fuel mixture fraction，and time averaged equivalent scalar dissipation rate in the combustor. The distribution of combustion species and heat release were obtained through the flamelets model. The three dimensional information was added into the one-dimensional unsteady calculation model by integrating the cross section area of the flow channel. The one-dimensional parameter distribution was obtained by solving the flow governing equations. Subsequently，several examples of verification show that this method overcomes the adverse effect of the three-dimensional fuel jet，and can well predict the wall pressure profiles in the combustor.