法向激波下游共流射流增强跨音速超临界翼型

Michael G. Fernandez, J. N. Hoffmann, Gecheng Zha
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引用次数: 4

摘要

本文通过将超临界共流射流(CFJ)置于正常激波下游来提高跨音速共流射流(CFJ)翼型巡航性能的数值研究。采用Reynolds平均Navier-Stokes(RANS)方程和单方程SpalartAllmaras湍流模型。采用一种带有低扩散黎曼解的三阶加权基本非振荡(WENO)格式来计算无粘通量。粘性项采用二阶中心差分格式。通过数值试验研究了CFJ位置对激波位置和翼型效率提高的影响。本研究发现,将CFJ放置在激波的下游,会产生感应效应,使激波进一步向下游移动,并扩大超音速区域。此外,放置在激波下游的CFJ不会因为CFJ注入和吸力之间的激波边界相互作用而遭受熵的增加。它大大降低了CFJ的功率消耗。超临界翼型的升力系数CL和气动效率(L D)c都提高了超临界翼型的巡航效率,其中考虑了CFJ运行所需的功率。研究表明,与基准型号RAE2822相比,气动效率提高了5.26%,与标准型号CFJ-RAE2822相比,气动效率降低了6.68%。通过峰值(lc /CD) C测量,效率比基准RAE2822提高了6.68%,比标准CFJ-RAE2822降低了17.51%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transonic Super-critical Airfoil Enhancement by Coflow Jet Downstream of Normal Shock
This paper performs a numerical study to enhance transonic supercritical Coflow Jet (CFJ) airfoil cruise performance by placing the CFJ downstream of the normal shock wave. The Reynolds averaged Navier-Stokes(RANS) equations with one-equation SpalartAllmaras turbulence model is used. A 3rd order weighted essentially non-oscillatory (WENO) scheme with a low diffusion Riemann solver is utilized to evaluate the inviscid fluxes. A 2nd order central differencing scheme is employed for the viscous terms. Numerical trade studies are carried out to investigate CFJ location effects on the shock location and the airfoil efficiency enhancement. This research discovers that placing a CFJ downstream of a shock wave, results in an induction effect that moves the shock further downstream with enlarged supersonic region. Furthermore, the CFJ placed downstream of the shock wave will not suffer the entropy increase due to the shock boundary interaction occurring between the CFJ injection and suction. It substantially reduces the CFJ power expenditure. The effects enhance the cruise efficiency of the supercritical airfoil for both the coefficient of lift CL and the aerodynamic efficiency ( L D )c, which takes into consideration the power required to run the CFJ. The study shows that the aerodynamic efficiency is increased by 5.26% over the baseline RAE2822 and decreasd by 6.68% over the standard CFJ-RAE2822. Measuring by peak (C L/CD)c results in an efficiency increase of 6.68% over the baseline RAE2822 and a decrease of 17.51% over standard CFJ-RAE2822.
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