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具攻角效應與孔隙效應的穿音速流場計算與代數紊流模式

Transonic Flows Computation and Algebraic Turbulence Model with Effects of both Angle of Attack and Porosity

摘要


本研究以「薄層迫近法」來模擬10度攻角有孔隙表面SOCBT彈的穿音速流場,首先提出了新的雙層紊流模式內、外部區域的修正理論,來處理「攻角」與「孔隙」雙重效應。其研究結果顯示,當彈丸在10度攻角時,其船尾部的震波,可藉「孔隙結構」的使用,而可有效的將強震波減弱為λ形弱震波,使得彈丸的飛行阻力減少了9.97%而昇力增加了11.86%。

並列摘要


With a new two-layer algebraic turbulence model, the thin-layer Navier-Stokes equations are employed to simulate a transonic flow past a SOCBT projectile with porous surface at 10° angle of attack. The porous surface at the boattail of a SOCBT projectile has caused effectively the original normal shock to become a weaker lambda shock, resulting in a drag reduction and a lift increase. In the present study, a total drag reduction about 9.97% and a lift increase of 11.86% can be achieved.

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