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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。
In order to obtain the parameter distribution in bimodal combustion chamber quickly, the jet model was used to obtain the three-dimensional distribution of the mean value, the pulsation value and the mean value of the equivalent scalar dissipation rate in the bimodal ramjet engine combustion chamber. The combustion model and the distribution of heat release were obtained by using the flame surface model. The three-dimensional information was added to the one-dimensional unsteady calculation model through the cross-sectional area of the flow channel, and the one-dimensional parameter distribution of the dual-mode combustion chamber was obtained by solving the flow control equation. The results show that the proposed method can predict the variation trend of the pressure inside the combustion wall more accurately and overcome the adverse effect of non-dimensional fuel jet on the one-dimensional calculation method.