平流层飞艇外形气动特性分析

结合某平流层飞艇的外形设计,文章采用数值模拟的方法研究了平流层飞艇外形的气动特性。基于雷诺平均N-S方程,采用非结构网格的有限体积方法进行了求解;空间离散分别采用了Jameson的中心格式和Osher逆风格式,时间离散则采用五步Runge-Kutta格式;紊流模型分别采用了S-A一方程模型M-SST两方程模型。本研究有助于了解平流层飞艇的气动特性及气动外形设计过程中存在的问题,为平流层飞艇设计提供参考依据。

Aerodynamic Characteristics Analyses of Stratospheric Airship

Aerodynamic characteristics of Stratospheric Airship are studied by the numerical method and the flow mechanisms for such flows are carefully analyzed.The governing equations are Reynolds-averaged Navier-Stokes equations which are solved by the unstructured finite element method.Jameson's central scheme with artificial dissipation and upwind Osher scheme are used for spatial discretisation and five-stage Runge-Kutta scheme is applied for temporal discretisation.Several turbulence models including B-L algebra model,S-A one equation model and SST two equation model of Menter are adopted.This research is helpful to understand the aerodynamic characteristics and flow mechanisms of stratospheric airship at different angles of attack and will provide reasonable reference for stratospheric airship design.