航空工程进展
航空工程進展
항공공정진전
ADVANCES IN AERONAUTICAL SCIENCE AND ENGINEERING
2012年
3期
263-268,299
,共7页
地面效应%结构动网格%影响函数%无人机%Navier-Stokes方程%双尾撑布局
地麵效應%結構動網格%影響函數%無人機%Navier-Stokes方程%雙尾撐佈跼
지면효응%결구동망격%영향함수%무인궤%Navier-Stokes방정%쌍미탱포국
ground effect%dynamic structured grid%influence function%unmanned aerial vehicles%Navier-Stokesequation%twin-boom
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。
為瞭更好地分析地麵效應對無人機氣動特性的影響,採用一種新的結構動網格生成技術,運用CFD手段對某無人機的地麵效應進行瞭研究。在一套靜態網格CFD計算基礎上,運用結構動網格生成技術,穫得非定常的網格移動,得到一繫列的不同攻角、地麵效應高度的CFD網格及初始流場。在此基礎上進行定常流場求解,計算得到地麵效應的定常CFD結果。最後對某雙尾撐佈跼無人機的地麵效應進行瞭CFD計算研究,對相應的全機氣動特性的影響進行瞭分析。計算結果錶明:地麵效應對平尾的影響大于對機翼的影響併使平尾的失速迎角提前;該方法是可行的,具有一定的工程應用價值。
위료경호지분석지면효응대무인궤기동특성적영향,채용일충신적결구동망격생성기술,운용CFD수단대모무인궤적지면효응진행료연구。재일투정태망격CFD계산기출상,운용결구동망격생성기술,획득비정상적망격이동,득도일계렬적불동공각、지면효응고도적CFD망격급초시류장。재차기출상진행정상류장구해,계산득도지면효응적정상CFD결과。최후대모쌍미탱포국무인궤적지면효응진행료CFD계산연구,대상응적전궤기동특성적영향진행료분석。계산결과표명:지면효응대평미적영향대우대궤익적영향병사평미적실속영각제전;해방법시가행적,구유일정적공정응용개치。
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.