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本文对两相流条件下的环缝式气动喉部方案进行了数值模拟。气-粒两相流动模型采用二维轴对称欧拉-拉格朗日模型。研究了二次流不同喷射位置、角度、流率及喷嘴个数对气动喉部调节有效喉部面积大小的影响规律。模拟得到了两相流条件下气动喉部的流场特征,结果表明使二次流的喷入位置越靠近喉部、增大二次流流量或减小喷射角度都能明显增加气动喉部调节性能;由此归纳出增强气动喉部对主流扼流能力的两种主要机制,即增加挤压和流阻。
In this paper, the numerical simulation of annular pneumatic laryngeal scheme under two-phase flow conditions is carried out. The gas-particle two-phase flow model uses a two-dimensional axisymmetric Euler-Lagrange model. The effect of different jet position, angle, flow rate and number of nozzles on the effective throat area of pneumatic throat was studied. The flow characteristics of the aerodynamic throat under two-phase flow were simulated. The results show that the closer the secondary flow is to the throat, the larger the secondary flow or the smaller the injection angle, the aerodynamic laryngeal regulation can be significantly increased Performance; thus concludes two main mechanisms for enhancing aerodynamic throat choke on the mainstream, namely increasing squeeze and flow resistance.