水陆两栖飞机静水面高速滑行性能数值计算与试验分析

Numerical Calculation and Test Analysis of High Speed Taxiing Performance of Amphibious Aircraft on Calm Water

针对水陆两栖飞机静水面高速滑行过程的运动响应大、流场强非线性等问题,提出了一种基于传统动网格技术的"状态预估--精确计算"的数值模拟方法:通过求解Reynolds平均N-S方程结合运动方程来模拟飞机静水面滑行时的流场特征和运动特性,数值模拟方法为隐式有限体积法,湍流模型采用k-ω(SSTMenter)结合壁函数进行处理,自由液面捕捉采用VOF方法;数值计算时,首先采用粗网格对简化后的飞机在不同航速下的姿态和升沉进行快速预估,再将飞机置于预估状态下进行精确网格划分,最后进行精确数值计算分析.为了验证数值模拟结果的正确性,在物理水池中进行了静水拖曳试验,将数值计算结果与试验结果进行对比分析可得:数值计算与水池试验的流场特征吻合,且阻力、姿态和升沉的计算精度达到90%,验证了数值模拟方法的可行性.

Aiming at the problems of large motion response of amphibious aircraft and strong non-linearity of flow field during high speed taxiing on calm water,a numerical method based on traditional dynamic mesh method was proposed.It is used to simulate the flow field characteristics and motion characteristics of the aircraft taxiing on calm water by solving Reynolds Average N-S equations and motion equations.This method is an implicit finite volume method.The turbulence is treated by k-ω(SST Menter) model with wall function and the free surface is captured by VOF method. The attitude and heave of the aircraft at different speeds were predicted quickly by using coarse grids.Then the aircraft was placed in the predicted state for fine grid generation,and finally the precise numerical analysis was carried out.In order to verify the correctness of the numerical results,a test was carried out in tank,and the numerical results were further compared with the test results.It shows that the simulation is consistent with the flow field characteristics of the test,and the calculation accuracy of resistance,attitude and heave reaches 90%.The feasibility of the numerical method was verified.