Numerical Simulation of a Passive Control Method for Optimal Drag Reduction of Turbulent Transonic Projectiles

被動式控制法應用於紊流穿音速彈體最佳化阻力減低之數值研究

傅健康(Jan-Kaung Fu) ； 梁勝明(Shen-Min Liang)

《中國航空太空學會學刊》 26卷2期 (1994/06) Pp. 149-160

https://doi.org/10.6124/TAASRC.199406_26(2).07

摘要

本文旨在針對一被動式震波／邊界層交互作用控制法(Passive control of shock/boundary-layer interaction)應用於減低具有船尾(boattaifed)的紊流穿音速彈體之阻力，來進行流場與空氣動力阻力的數值研究。藉著改變不同的參數值，如孔隙分佈(Porosity distribution)、最大孔隙因子(maximum porosity factor)及孔隙範圍大小(sizo of porous region)，來驗證此方法的有效性，並尋求最佳阻力減低之參數值，計算結果發現此被動式檳制法不但可減低船尾阻力(boattail drag)，亦可減低底端阻力(base drag)，與不用此被動式控制法的結果相比，可進一步減少約8歸的總阻力值。因此，此被動式控制法在高性能彈體設計上，將具有重大的貢獻。

關鍵字

被動式控制法 ； 震波／邊界層交互作用 ； 阻力減低

並列摘要

The purpose of this research is to numerically study a drag reduction method-passive control of shock/boundary layer interaction, which is applied to the bottail portion of a secant-ogive-cylinder-boattail projectile in turbulent transonic flows. The flow pattern and components of aerodynamic drag computed from numerical data are analyzed. The effectiveness of this method is studied by varying the valnes of parameters such as porosity distribution, maximum porosity factor and size of porous region. The conditions for optimal drag reduction are investigated and suggested. The present results show that the use of this passive control method not only can reduce the boattail drag but also can reduce the base drag, and results in an additional 8% total drag reduction compared to that without the passive control technique. This passive control method can be an effective approach for the design of high-performance projectiles in the transonic regime.

並列關鍵字

Passive Control ； Shock/Boundary Layer Interaction ； Drag Reduction