摘要
为了更好地分析地面效应对无人机气动特性的影响,采用一种新的结构动网格生成技术,运用CFD手段对某无人机的地面效应进行了研究。在一套静态网格CFD计算基础上,运用结构动网格生成技术,获得非定常的网格移动,得到一系列的不同攻角、地面效应高度的CFD网格及初始流场。在此基础上进行定常流场求解,计算得到地面效应的定常CFD结果。最后对某双尾撑布局无人机的地面效应进行了CFD计算研究,对相应的全机气动特性的影响进行了分析。计算结果表明:地面效应对平尾的影响大于对机翼的影响并使平尾的失速迎角提前;该方法是可行的,具有一定的工程应用价值。
In order to analyze the ground effect on unmanned aerial vehicle（UAV） aerodynamic characteristics, a new technology of dynamic structured grid generation is used, and CFD as tools is used to research on ground effect of UAV. Based on static state structured grid of the CFD, the technology can be used to obtain a series of grid for CFD. In those grids, the UAV has different ground effect^s altitudes and different attitude angles of at- tack. In unsteady grid motion and flow-field, the steady flow-field is solved, and steady ground effect aerody- namic character result of UAV can he obtained. Finally, the ground effect of twin-boom UAV is analyzed and the influence on aerodynamic property is discussed. The Computational results indicate that ground effect of tail is larger than wing while the stall angle of tail is decreased and this method is valid for estimating the ground effect of UAV.
出处
《航空工程进展》
2012年第3期263-268,299,共7页
Advances in Aeronautical Science and Engineering
基金
国防基础科研基金(A2720060290)
