航空工程进展
航空工程進展
항공공정진전
ADVANCES IN AERONAUTICAL SCIENCE AND ENGINEERING
2012年
2期
156-161
,共6页
粗糙度%对流换热%粗糙微元%冰形
粗糙度%對流換熱%粗糙微元%冰形
조조도%대류환열%조조미원%빙형
roughness%convective heat-transfer%roughness element%ice shape
飞机的结冰表面出现微小的凹凸不平，即形成所谓的粗糙度，对飞机气动性能产生一定的影响。在考虑表面粗糙度时，针对对流换热系数的计算建立了热力学模型，同时对只有单个粗糙微元的表面进行了流场计算和表面对流换热效果分析；然后利用边界层积分方法，对某一翼型光滑表面和不同程度的粗糙表面分别进行了流场计算、对流换热系数计算以及结冰冰形的模拟仿真。结果表明：结冰表面粗糙度很大程度增强了表面的对流换热效果，导致在翼型前缘位置结冰厚度更大、冰角突出更为明显并且距离驻点区域更近。
飛機的結冰錶麵齣現微小的凹凸不平，即形成所謂的粗糙度，對飛機氣動性能產生一定的影響。在攷慮錶麵粗糙度時，針對對流換熱繫數的計算建立瞭熱力學模型，同時對隻有單箇粗糙微元的錶麵進行瞭流場計算和錶麵對流換熱效果分析；然後利用邊界層積分方法，對某一翼型光滑錶麵和不同程度的粗糙錶麵分彆進行瞭流場計算、對流換熱繫數計算以及結冰冰形的模擬倣真。結果錶明：結冰錶麵粗糙度很大程度增彊瞭錶麵的對流換熱效果，導緻在翼型前緣位置結冰厚度更大、冰角突齣更為明顯併且距離駐點區域更近。
비궤적결빙표면출현미소적요철불평，즉형성소위적조조도，대비궤기동성능산생일정적영향。재고필표면조조도시，침대대류환열계수적계산건립료열역학모형，동시대지유단개조조미원적표면진행료류장계산화표면대류환열효과분석；연후이용변계층적분방법，대모일익형광활표면화불동정도적조조표면분별진행료류장계산、대류환열계수계산이급결빙빙형적모의방진。결과표명：결빙표면조조도흔대정도증강료표면적대류환열효과，도치재익형전연위치결빙후도경대、빙각돌출경위명현병차거리주점구역경근。
There are slim unsmooth icing surfaces of aircraft, i.e. so-called ＂roughness＂ is formed, which will produce certain influences on the aerodynamic performances of aircraft. The model of convective heat-transfer coefficient is set up with surface roughness being considered, and then the flow field and the convective heat- transfer coefficient distribution are calculated for the surface with a single roughness element. The integral boundary layer solution is developed to account for surface roughness in the calculation of the convective heat- transfer coefficient for a two dimensional airfoil. At last the ice shape simulation is carried out in the smooth and roughness surface respectively. The results show that the convective heat-transfer is enhanced very well and the ice accretion is affected evidently due to surface roughness at the leading edge.
