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題 名 | Numerical Simulation of Reynolds Number Effects on Turbulent Transonic Flows Over a Projectile with and Without Spinning=旋轉及非旋轉紊流穿音速彈體上雷諾數效應之數值模擬 |
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作 者 | 傅健康; 梁勝明; | 書刊名 | 力學 |
卷 期 | 10:4 1994.12[民83.12] |
頁 次 | 頁317-323 |
分類號 | 447.553 |
關鍵詞 | 空氣動力阻力; 穿音速流; 隱式TVD方法; 旋轉率; Aerodynamic drag; Transonic flow; Implicit TVD sheme; Spin rate; |
語 文 | 英文(English) |
中文摘要 | 本文旨在針對旋轉中穿音速彈體之雷諾數效應,對其氣動阻力及其性能上的影響 ,來進行數值的分析研究。為求正確地預估雷諾數對旋轉彈體之各阻力成份及總阻力的影響 , 本研究採用一隱式對角化之對稱性 TVD 方法,來解軸對稱之薄層那維耶一史拓克方程式 ( thin-layer, Navier-Stokes eqs. )。計算結果顯示,在固定之旋轉率情況下,若增加 雷諾數值, 會造成前體壓力阻力( nose pressure drag )和底端阻力( base drag )的 增加,以及黏性阻力( viscous drag )的減小;而這些阻力成份的改變會導致總阻力的降 低。因此,為使旋轉之穿音速彈體具有較佳的性能,建議應以較高的雷諾數( Re > 4.6 × 10 �間^來飛行。本研究的高性能彈體之外型設計上,將可提供有力之參考。 |
英文摘要 | The Reynolds number effects on the performance of a spinning secant- ogive-cylinder (SOC) projectile in the turbulent transonic flows in terms of aerodynamic drag has been analyzed numerically in this study. To accurately predict the Reynolds number effect on individual drag components and total drag of a projectile with and without spinning, the implicit, diagonalized, symmetric Total Variation Diminishing (TVD) scheme, accompanied by a suitable grid, is employed to solve the thin-layer axisymmetric Navier-Stokes equations associated with the Baldwin-Lomax turbulence model. The computed results show that at fixed spin rate, to increase Reynolds number can cause increases in nose pressure drag and base drag coeffieients, as well as a decrease in viscous drag coefficient. These variations in drag components result in a total drag reduction; thus, in order to get a better performance, the flight condition at higher Reynolds number (Re>4.6 × 10 �� )is suggested for the SOC projectile with spinning. |
本系統中英文摘要資訊取自各篇刊載內容。