base drag 中文意思是什麼
base drag
解釋
底部阻力-
It can be used not only to change the fire precision of the base bleed projectile, but also to improve the effect of reduction drag and expansion range. the calculating model of the secondary expansive pressure of the burning gas is constructed by means of analysis of the experimental resuits, it has been confirmed that the new base bleed unit can be designed, with the secondary expansive principle of the burning gas pressure. the engineering project of a hybrid base - bleed - rocket high - level efficient extended - range projectile is designed, with the secondary expansive principle of the burning gas pressure, the feasibility and the true worth of its engineering applications is validated in theory
本文提出了底排燃氣壓力不隨外部壓力變化，既可改善底部彈射擊精度又可提高減阻效果的二次擴張原理，建立了底排燃氣二次擴張壓力的計算模型，並通過採用二次擴張原理的新型底排裝置與傳統底排裝置的對比試驗，驗證了新型底排裝置結構實現的可行性；完成了基於底排燃氣二次擴張高效增程原理的底排?火箭復合高效增程彈方案設計及其有關計算，從理論上驗證了其工程應用的可行性和實際價值。 -
( 4 ) the drag reduction of plane - surfaces with v - shaped grooves is given out by direct numerical simulation, and the drag reduction mechanism in the base of the secondary flow theory is suggested
（ 4 ）利用直接數值模擬方法求得平板上v ?型條紋表面上的降阻情況，並給出基於二次流動理論的降阻機理。 -
The purple sand hand - drag base art breaks the banlance of old hitting base art and dang - base model from song dynasties to now
紫砂手拉坯工藝打破了自宋代起至今的傳統打坯鑲接成形法與模型擋坯、灌漿澆注成型法的一統天下，避免了傳統成型所留下的泥條接頭線與模型接線。 -
By analyzing flow status of fluid in aerating pipeline, giving up hydraulics and utilizing hydromechanics and advance numerical calculations, the prediction method to solve optimizations height on flow status in aerating pipeline is studied and put forward, which provides a scientific theory base to realize effective drag reduction and economic principle in blend phase transportation for pipeline design
摘要通過分析摻入少量高粘流體形成分層紊流層流的流動狀態，拋棄傳統的水力學研究方法，應用流體力學原理、高級程序設計語言和先進的數值計算技術研究了摻入少量高粘流體分層紊流層流減阻規律，為實現管道混相輸送時高效減阻和經濟節約的設計提供理論依據。 -
The aerodynamic objective function is described as some aerodynamic parameters gained by reynolds - averaged n - s equations, such as : the lift, the drag, the ratio of lift to drag or the pitching moment, etc. the optimum process is started by a base airfoil
本文採用基於n - s方程的流場計算程序來求解流場，得到升力系數、阻力系數、力矩系數等氣動參數，並以其中某個或某些參數構成目標函數。
分享友人