悬停共轴刚性旋翼直升机涡尾迹高精度数值模拟

High-accurate numerical simulation of wake vortex over coaxial rigid rotor helicopter in hover

针对共轴刚性旋翼直升机流场涡尾迹的高精度数值模拟需求,结合结构化运动嵌套网格技术、高精度数值格式和非定常RANS方法,建立了共轴刚性旋翼直升机的非定常涡流场高精度数值模拟方法及高效并行化自主软件平台。运用所发展的方法和软件平台,进行了类“X-2”构型共轴刚性旋翼直升机悬停状态涡尾迹结构的高精度数值模拟。结果表明,所发展的数值模拟方法具有较高的计算效率和计算精度,能够捕捉到精细的涡尾迹结构及其非定常生成、发展和演化过程。

In order to accurately capture the wake vortex of coaxial rigid rotor helicopters,a highaccurate numerical simulation method of the unsteady vortex filed and an efficient parallel software platform for the coaxial rigid rotor helicopter are established by combing the structured dynamic overset grid technique,the high-order numerical scheme,and the unsteady RANS method.A high-accurate simulation of the wake vortex over an"X-2"configuration coaxial rigid rotor helicopter in hover is carried out by using the method and software developed in the paper.The results show that the developed method has a high computational efficiency and accuracy,and can capture the sophisticated vortex wake structure and its unsteady generation,development and evolution process.