具阻塊之三維高溫雙矩形噴射撞擊流場數值模擬

Numerical Simulation and Analysis of Three-Dimensional Turbulent Impinging Twin-Jet Flow with High Temperature and Blocks

莊書豪(Shu-Hao Chuang) ； 江俊顯(Jiunn-Shean Chiang)

《中國航空太空學會學刊》 33卷2期 (2001/06) Pp. 87-94

https://doi.org/10.6124/TAASRC.200106_33(2).04

摘要

本文以數值方法分析垂直起降飛機(VTOL)在凹凸不平地表從事起降的複雜流場。文中採用K-ε紊流模式，以控制體積法建立差分方程式，配合SIMPLEST計算求解程序，藉以模擬三維、高溫、高壓氣體之矩形噴口雙噴射撞擊流場，並分別就阻塊的數目、橫向流的有無、噴射流角度等參數變化對流場之速度、溫度和壓力的影響做逐一探討。對橫向流、阻塊、噴嘴角度等參數變化而言，橫向流會使停滯線里彎曲，阻塊效應將使上沖噴泉變弱，流場壓力下降，溫度升高。又噴流角度方向將明顯影響上沖噴泉的強弱與流場的結構與性質。

關鍵字

κ-ε紊流模式 ； 上沖噴泉流 ； 橫向流 ； 阻塊

並列摘要

In this study the flowfield of vertical take-off landing (VTOL) military airplane working on the rough ground is simulated by numerical simulation The κ-ε turbulence model is adopted and the control-volume integration for finite difference associated with SIMPLEST algorithm are employed to simulate the three-dimensional, high-temperature and high-pressure flowfield. The effects of block, crossflow and impinging angle on the flowfield are discussed one by one in this paper. The velocity of upwash fountain is decreased when the distance between the two plates is less than 3D. The stagnation line distorted with crossflow and the strength of upwash fountain become weaken with blocks. The inward jets will enhance the upwash fountain, and decreasing the pressure and the temperature. On the contrary, the outward jets will decline the upwash fountain, whereas increasing the pressure and the temperature. In summary, the variation of parameters, such as crossflow, block, and impinging angle is strongly correlated with the upwash fountain and the flowfield structure.

並列關鍵字

κ-ε turbulent model ； up-wash fountain ； crossflow ； block