同样，我们目前使用的原始化学火箭。
限制的化学火箭发动机。
结合气动谐振点火器进行头部设计的氢氧变轨火箭发动机是一项新颖化学火箭推进技术，尤其适于空间站应用。
Orbit maneuver hydrogen-oxygen thruster based on gas dynamic resonance igniter is a novel chemical propulsion technology especially prospective in space station application.
同时，它可以取代化学燃料火箭来帮助卫星从近地轨道变轨至静止轨道。
In the meantime, it could replace chemical rockets for pushing satellites from low Earth orbit to geostationary orbit.
有人可能会认为聚变推进需要一些能量高于标准的化学燃料一百多万倍的稀有燃料推进一个火箭。
One might think that fusion propulsion requires some exotic fuel to propel a rocket a million-or-so-times more energetically than standard chemical fuels.
迄今为止NASA研究了两种前往那里的备选推进器：核热火箭和化学发动机。
So far NASA is exploring two options for propulsion there? A nuclear thermal rocket and a chemical engine.
鉴于化学燃料火箭浪费太多的推进剂难以实现飞船速度的静变化，电力推进器仅仅使用一小点推进剂就可以做同样的任务。
Whereas chemical rockets waste too much propellant to reach a net change in spacecraft velocity, electric thrusters can do exactly the same mission using just a small fraction of the propellant.
研究者希望化学反应后产生的氢，不仅能发射火箭，也能为长时间的空间任务补充氢电池。
Researchers hope that the hydrogen products of that reaction might go beyond launching rockets, and also feed hydrogen fuel cells for long duration space missions.
使用化学燃料火箭是多么的笨重。
化学燃料动力火箭可以提供克服地球引力所必须的强大推进力。
Chemical rockets have the high thrust necessary to lift rockets into space, overcoming the Earth's gravitational pull.
一个工程师称核能火箭的效率天生比它们的化学兄弟火箭高一倍。
One engineer claims nuclear rockets are inherently twice as efficient as their chemical brethren.
这种火箭需要携带的燃料也减少了，并且不需要化学氧化剂。
It thus needs to carry less fuel than a rocket, and no chemical oxidant to burn that fuel, as a rocket would.
但其排气速度却异常惊人，大约为化学燃料火箭的十倍—这使得离子推进器的效率非常高。
The exhaust velocity, though, is enormous—more than ten times that of a chemical rocket—and this makes ion propulsion extremely efficient.
从技术上讲，化学燃料火箭的最大速度增长比较低。这就是说，它们的排气速度还不足以将火箭的速度增加到非常快的程度。
In technical terms, chemical rockets have low maximum velocity growth, which means that their exhaust velocities are not high enough to impart very high speeds to the rocket.
固体火箭发动机的点火是一个十分复杂的物理化学过程，包括三个阶段：点火延迟、火焰传播和燃烧室气体充填。
The ignition of the solid rocket motor (SRM) is a very complex physical and chemistry process, which is composed of three component phases: ignition delay, flame spreading and chamber filling.
带有核燃料火箭的宇宙飞船可在普通化学燃料火箭上发射。
The spacecraft, with its nuclear rockets, would be launched on top of a conventional chemical rocket.
科学家们正在研制比目前化学燃料火箭飞行更快速的推进系统。
Scientists are already experimenting with propulsion systems that may travel much faster than today's conventional chemical rockets.
她已经在试验发射带有特殊化学药品的火箭尝试人工降雨。
She has been firing rockets with special chemicals at rain clouds to see if she can create precipitation.
相比之下，火箭的化学能功率是推进力的一半乘以排气速度。
By comparison, the chemical power generated by a rocket equals one half the thrust times the exhaust velocity.
建立了任意斜交曲线坐标系下液体火箭发动机(LRE)内部工作过程的气液两相湍流化学反应流模型。
Two-phase turbulent reacting flow model of the internal operating processes in Liquid Rocket Engine (LRE) is set up in non-orthogonal curvilinear coordinates.
如果仅仅使用化学燃料火箭，我们探索外层空间行星及其卫星的能力将受到限制，这是不难证明的事实。
It is an easily provable fact that with only chemical rockets, our ability to explore the outer planets and their moons is hindered.
这样，当普通燃料火箭到达地球轨道约800公里高度时，核反应堆舱会脱离化学燃料火箭，并开始工作。
Then, once the vehicle had ascended to high-Earth orbit, above about 800 kilometers, the nuclear reactor module would detach from the chemical rocket and start up.
要完成上述使命，我们需要以核反应为动力的火箭，而不是燃烧化学品的火箭。
For missions such as these, we will need rockets powered by a nuclear reaction rather than igniting chemicals.
与化学燃料火箭相比，核燃料火箭能达到每秒大约22公里的最大速度。
Nuclear rockets, in contrast to their chemical counterparts, could impart a maximum velocity of up to about 22 kilometers a second.
但是，在所用燃料量相同的情况下，化学燃料火箭所提供的能量较低，将宇宙飞船进行远距离发送时，这一点就是一个严重的缺陷。
But the relatively low amount of energy that they can deliver for a given mass of fuel is a severe drawback when dispatching spacecraft over long distances.
但是，在所用燃料量相同的情况下，化学燃料火箭所提供的能量较低，将宇宙飞船进行远距离发送时，这一点就是一个严重的缺陷。
But the relatively low amount of energy that they can deliver for a given mass of fuel is a severe drawback when dispatching spacecraft over long distances.
应用推荐