矩形喷管内外喷流流场的数值模拟

Numerical Simulation in Flow Fields of a Rectangular Nozzle

基于 Ｆｒａｖｅ 平均的 Ｎ Ｓ方程和 Ｂ／ Ｌ 湍流模型，采用了 Ｊａｍ ｅｓｏｎ 格式和 Ｍ Ｕ Ｓ Ｃ Ｌ 格式，对外流在亚声、超声和零 Ｍ ａｃｈ 数三种状态时矩形喷管的喷流流场进行了数值模拟，探讨了内外喷流及喷管内的流动特征，并与实验数据进行了比较，计算结果与实验结果吻合较好，验证了计算所使用的 Ｎ Ａ Ｐ Ａ 软件的可靠性，从而为用计算流体力学的方法模拟具有两股来流的三维湍流流场提供了一种有效的手段。

Based on Frave averaged three dimensional compressible Navier Stokes equations and Baldwin Lomax algebraic turbulence model, the jet flow field of a rectangular nozzle under the state of subsonic, supersonic and zero Mach number is simulated. The characteristics of the flow from inside and outside nozzle and jet flow are discussed and the numerical results are compared with experimental data. The comparison shows that they match well. It verified the reliability of the NAPA software used in the simulation, and so an effective method for simulating three dimensional turbulent flow field with two inflows by computational fluid mechanics is achieved.