论文部分内容阅读
采用在点对点多块结构化网格系统上求解三维可压缩雷诺平均N-S(Navier-Stokes)方程的方法,研究了发动机动力效应对民机起飞构型气动特性的影响.首先,通过涡轮动力模拟器风洞试验模型及民机高升力构型标准模型,对研究方法进行了验证,计算和试验结果的良好吻合说明研究方法用于模拟发动机动力效应及预测民机高升力构型气动特性是可行的.其次,针对分别安装通气短舱和动力短舱的某翼吊涡扇发动机民机起飞构型,研究了发动机动力效应对其气动特性的影响规律.结果表明:在通气短舱基础上预测的起飞最大升力系数、失速迎角以及阻力和力矩,在考虑动力效应后会产生明显的不同.动力效应可使外形最大升力系数增大并延迟机翼失速,但同时也带来了低头力矩增大和升阻比降低的不利影响.建议在对机翼及其高升力装置设计结果的数值校核中使用考虑进排气的动力短舱代替目前常用的通气短舱,这能为设计改进提供更可靠的依据.
A three-dimensional Compressible Navier-Stokes (NS) equation was solved by using point-to-point multi-block structured grid system and the effect of engine power effect on the aerodynamic characteristics of take-off configuration of civil aircraft was studied.Firstly, through the turbine power simulator Wind tunnel test model and civil aircraft high lift configuration standard model, the research methods were verified and the calculated results agree well with the experimental results. It is feasible to use the research method to simulate the engine dynamic effect and predict the aerodynamic characteristics of the civil aircraft high lift configuration .Secondly, the influence of engine dynamic effects on the aerodynamic characteristics of a turbofan fan-mounted turbofan engine mounted on a nacelle and a propulsion nacelle respectively is studied. The results show that the prediction of The maximum lift coefficient of takeoff, the angle of attack at attack, and the drag and torque will have significant differences after considering the dynamic effect. The dynamic effect can increase the maximum lift coefficient of the shape and delay the stall of the wing, but at the same time, Lift resistance ratio to reduce the adverse effects.It is recommended in the wing and its high lift device design value of the numerical verification used to consider the row The nacelle power instead of the commonly used ventilation nacelle, which can provide a more reliable basis for design improvements.