Simulation on Powered Effects of BWB at Take-off Condition

翼身融合布局起飞状态动力效应影响研究

School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China

Received: 5 June 2019

Abstract

The influence of engine powered effects on aerodynamic characteristics of BWB300, which was designed by the Airplane Concept Design Institute of Northwestern Polytechnical University, at take-off condition was analyzed by using the numerical simulation method. Firstly, the method of using the inlet and exhaust boundary conditions to analyze the powered engine was validated. Then, the engine powered effects on BWB300 aerodynamic characteristics at take-off condition were researched with flow through nacelle and with powered nacelle. The results indicated that though the powered effect changing the value of aerodynamic forces, there was no change in the aerodynamic curve trend. It's recommended that the engine power effect should be considered in numerical simulation by using with powered nacelle to gain more accurate values of aerodynamic forces. Nevertheless, with flow nacelle also could be used to gain some regular results.

摘要

以西北工业大学布局设计研究所设计的翼身融合布局民机构型BWB300为研究对象，对起飞状态下动力效应对其气动特性影响进行了数值模拟分析。首先，对设置进排气边界条件模拟发动机动力效应方法进行了验证。然后，通过对比分析分别安装通气短舱和动力短舱的BWB300起飞状态的数值模拟结果，研究了发动机动力效应对其气动特性的影响规律。研究结果表明：动力效应会增加构型的升阻力系数，改变其俯仰力矩系数，但不会改变气动曲线的变化趋势，通气和动力构型在最大升阻比和最大升力系数处的迎角相同。故在对BWB300飞发一体化设计分析中，使用动力短舱可获得更加精确的结果，但使用通气短舱，也可得出较为可靠的规律性结论。