民用客机可变弯度机翼优化设计研究

Research on Variable Camber Wing Optimization Design of Passenger Aircraft

远程宽体客机在实际飞行状态下,机翼变弯度有效减阻能够提升客机性能和飞行品质。以全机配平构型为研究对象,基于襟翼、扰流板偏转建立变弯度模型;采用RANS方程实现阻力的精确求解并建立响应面模型,对不同升力系数、马赫数的多个飞行状态进行变弯度减阻优化;在此基础上,对实际飞行过程中变弯度操作需求及综合减阻性能进行分析,并采用布雷盖公式评估机翼变弯度后全航段综合巡航效率。结果表明:在巡航马赫数飞行时,采用两次变弯度设置即可在较宽的升力系数范围内获得减阻收益;在10 km定高巡航时,机翼变弯度可使整个航段综合减阻1.9 cts,航时、航程提高0.72%;在8和10 km进行一次阶梯巡航,机翼变弯度可使整个航段综合减阻2.9 cts,航时、航程提高1.19%。

The effective drag reduction of variable camber wing of wide-body passenger aircraft at realistic flight condition can improve the performance and flight quality of passenger aircraft.The whole trimmed passenger air⁃craft configuration is used as the research object,the variable camber model is established based on flaps and spoiler deflection.The Reynolds averaged Navior-Stokes(RANS)equation is used to solve the drag precisely,and estab⁃lish the response-surface model to perform the multiple flight conditions of different lift coefficients and Mach num⁃bers with variable camber drag reduction.On this basis,the requirement of camber variable manipulation and general drag reduction performance in practice flight process are analyzed,and the general profit of cruise efficiency is evaluated based on Breguet equation.The results show that two camber settings can lead drag reduction in a large range of lift.When the transport is cruising at a fixed altitude of 10 km,the variable camber wing can reduce the drag with 1.9 cts,and improve the flight time and endurance with 0.72%.When the transport is cruising at stepped altitudes of 8 km and 10 km,the variable camber wing can reduce the drag with 2.9 cts,and improve the flight time and endurance with 1.19%.