By comparison, the chemical power generated by a rocket equals one half the thrust times the exhaustvelocity.
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。
2
The exhaustvelocity, though, is enormous—more than ten times that of a chemical rocket—and this makes ion propulsion extremely efficient.
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。
3
Theoretically, it is proved that for both these engines, the properties of two-phase flow in nozzle can be analysed with a common combined parameter which is equivalent to exhaustvelocity.