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针对特种车辆内燃机上广泛使用的由旋风分离器和油浴过滤器组成的二级空气滤清器工作环境含尘量或含砂量大、使用寿命短的问题，提出利用气体动力学和计算流体力学的理论来选择旋风分离器的结构参数，提高旋风分离器的分离效率。文中用Ｎ－Ｓ方程和两方程模型来预测旋风分离器的流场。计算中采用零方程模型确定初始的涡粘系数的分布，用低雷诺数模型计算近壁区的流场，用高雷诺数模型计算紊流旺盛区的流场，得到了与实测值相吻合的计算结果
In view of the problem of large dust content or sand content and short service life of the secondary air filter, which is widely used in special vehicle internal combustion engines and consists of a cyclone separator and an oil bath filter, the paper proposes the use of gas dynamics and computational fluid Mechanics theory to choose the structural parameters of the cyclone separator to improve the separation efficiency of the cyclone separator. In this paper, N-S equation and two-equation model are used to predict the flow field of the cyclone. In the calculation, the distribution of the initial eddy viscosity was determined by using the zero equation model. The flow field in the near wall was calculated by the low Reynolds number model. The flow field in the turbulence area was calculated by the high Reynolds number model. Calculation results