突扩燃烧室内回流区长度研究

Study on the Length of Recirculation Zone inSuddenExpansion Combustion Chamber

讨论了热过程对圆管突扩回流流动的影响，数值计算的结果表明：圆管突扩流动中，加热使流动方向上的逆压梯度降低，从而使回流区长度减小，在此基础上，用均匀热源的方法来模拟热态的燃烧过程，对层流、湍流状况下分别拟合出回流区长度与燃烧温度的近似关系。

This paper discusses the influence of thermal process on the suddenexpansion pipe flow.The results of numerical modeling shows that gas heating leads to the decrease of the inverse pressure gradient in the flow direction.As a result,the recirculation zone becomes shorter.Meanwhile,based on the approximation of combustion heating by the homogeneous heat source,the correlations of the recirculation zone length and the combustion temperature are obtained under laminar and turbulent conditions respectively in order to predict the corner recirculation zone of the suddenexpansion chamber.