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词汇 Delta V
分类 英语词汇 英语翻译词典
释义

Delta V

原声例句
VOA Special 2015年6月合集

A Delta V rocket carried the satellite into space earlier this (last) month. The rocket was launched from Cape Canaveral Air Force Station in Florida.

上月早些时候德尔塔五号载着这颗卫星进入太空，这枚火箭是在佛罗里达州卡纳维拉尔角空军基地发射的。

Crash Course Physics 速成课物理

So, in that case, your equation would be delta v over delta t.

所以，在这种情况下，你的方程是 delta v 超过 delta t。

中文百科

ΔV Delta-v

（重定向自Delta V）

ΔV在天文动力学中字面上的意思是“方向和速度的变化”，但是ΔV也有特殊的意思：一个标量的单位用来测量一个轨迹变换用多少“作用力”，比如在改物质的轨道。

如没有其他动力，而如推力的方向是常量，可以简化成：

这就是“方向和速度的变化”、可是，在普遍的情况不可以怎幺简化。 假设，在时间 (t_1 - t_0)/2 有常量单向的推力的方向颠倒了，v (矢量) {v}_1 - {v}_0 = 0, 但是ΔV跟原来的没有颠倒推力的例子还是一样。

在火箭的情况，“没有其他动力” 一般来说不单是没有大气层的摩擦力，而是火箭发动机喷管没有空气静力的向后压力，所以“真空比冲”是用来算ΔV。

英语百科

Delta-v ΔV

（重定向自Delta V）
Figure 1:Approximation of a finite thrust maneuver with an impulsive change in velocity having the delta-v given by (4)
Abbreviations key: Escape orbit (C3), Geosynchronous orbit (GEO), Geostationary transfer orbit (GTO), Earth–Moon L4L5 Lagrangian point (L4/5), Low Earth orbit (LEO) Delta-v needed for various orbital manoeuvers using conventional rockets.[4][5] Red arrows show where optional aerobraking can be performed in that particular direction, black numbers give delta-v in km/s that apply in either direction. Lower-delta-v transfers than shown can often be achieved, but involve rare transfer windows or take significantly longer, see: fuzzy orbital transfers. The figure 2.5 for LEO to GTO is higher than necessary[6] and the figure of 30 for LEO to the sun is also too high.[7]

Delta-v (literally "change in velocity"), symbolised as Δv and pronounced delta-vee, as used in spacecraft flight dynamics, is a measure of the impulse that is needed to perform a maneuver such as launch from, or landing on a planet or moon, or in-space orbital maneuver. It is a scalar that has the units of speed. As used in this context, it is not the same as the physical change in velocity of the vehicle.
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