民用飞机机身后体端板阻力特性研究

Drag Characteristics of Civil Aircraft Fuselage's Afterbody End Plate

对于大型民用飞机,机身后体的阻力对全机阻力特性影响较大。为减小后体阻力,目前大多数民机在设计时重点研究后体参数(如上翘角、扁平度、长细比、收缩比等)对阻力特性的影响,但由于后体流场极为复杂,后体参数的设计并不能明显改善机身后体的气流分离现象。针对机身后体流场气流分离的特点,提出了一种在机身后体加装端板的方法,通过后体端板产生的旋涡达到改善机身后体气流分离的目的。结果表明:改进方法能有效地改善后体流场特性,优化机身后体气动性能。

For a large civil aircraft,rear fuselage s resistance has a great influence on resistance characteristics of the whole aircraft.In order to reduce resistance,the research on most of current civil aircrafts mainly focuses on the influence of post-body parameters,such as dihedral angle,flatness,slenderness ratio and shrinkage ratio on resistance characteristics.Because rear body s flow field is extremely complicated,the design of rear body parameters does not significantly improve the airflow separation phenomenon of rear fuselage.According to the characteristics of airflow separation of rear fuselage,a method of installing an end plate in a rear fuselage is proposed.The simulation results show that this method can effectively improve the flow characteristics of rear body and optimize aerodynamic performance of rear fuselage.