When the tire of aircraft landing gear passes through the contaminated runway, besides the side water spray, the water spray between the multi-wheels will collide and form the pattern similar to the tail of the rooster. This kind of water spray is called the cock tail flow. In this paper, numerical analysis is used to study the formation process of the cock tail flow caused by the main aircraft tires, and the water is simulated by smoothed particle hydrodynamics (SPH) method. According to the results of numerical simulation, the pattern and velocity distribution of cock tail flow are analyzed. The effects of water depth, tire spacing and tire speed on the pattern and velocity distribution of cock tail flow are obtained, and the formation mechanism of cock tail flow is revealed. It is preliminarily verified that numerical simulation using SPH method can analyze the specific problems of the tire including different configurations.

当飞机起落架轮胎通过污染跑道时，除了侧面喷水外，多轮之间的喷水还会碰撞，形成类似公鸡尾巴的图案。这种喷水称为鸡尾流。本文采用数值分析方法研究了飞机主轮胎引起的旋翼尾流的形成过程，并采用光滑粒子流体动力学(SPH)方法对水体进行了模拟。根据数值模拟结果，分析了旋尾流的形态和速度分布。获得了水深、轮胎间距和轮胎速度对旋翼尾流形态和速度分布的影响，揭示旋流尾流的形成机理。