摘要
发展了求解湿空气非平衡凝结流动的数值方法,对RAE 2822翼型在攻角为2.54°时的湿空气非平衡凝结流动进行了分析。结果表明,与干空气流动相比,随着相对湿度的增加超音区的结构发生显著变化,在60%和75%相对湿度条件下出现多重激波。湿空气非平衡凝结流动中升力系数和压差阻力系数随湿度增加显著降低,在75%相对湿度时升力系数减小15.7%,压差阻力系数减小53.2%。造成这种现象的原因是不同湿度条件下的成核率分布和凝结产生的液相质量分布发生了显著变化,导致凝结放热对流动的影响不同。
The aerodynamic characteristics of airfoil may be influenced obviously by the non-equilibrium condensation of water vapour carried by transonic moist air flow. A numerical method was developed to solve the moist air flow with non-equilibrium condensation. The transonic flows around the RAE 2822 airfoil with non-equilibrium condensation were simulated at 2.54~ angle of attack with different humidity. It was conclu- ded that the structure of the supersonic region is changed obviously with an increase in the relative humidity, compared with that in the dry air flow field. A complex multi-shock wave system is observed at the relative humidity of 60% and 75 %, respectively. The lift coefficient and the pressure drag coefficient decrease with an increase of the relative humidity. At relative humidity of 75%, the lift coefficient decreases by 15.7%, and the pressure drag coefficient by 53.2%. The variations of the nucleation rate and the condensate mass fraction, therefore the alteration of the influence of heat addition on the flow field, are responsible for the changes of the aerodynamic characteristics of RAE 2822 airfoil.
出处
《空气动力学学报》
CSCD
北大核心
2013年第5期592-597,共6页
Acta Aerodynamica Sinica
关键词
RAE
2822翼型
湿空气
非平衡凝结
气动特性
RAE 2822 airfoil
moist air
non-equilibrium condensation
aerodynamic characteristics
