旋翼转速 meaning in English

speed; whirling
whirling speed

Then a real - time quasi - steady turboshaft twin - engined model is founded by simulating the rotor speed fluctuation
为模拟大负载情况下旋翼转速的波动，建立了双发准定常涡轮轴发动机实时仿真模型。
The model considers as its states the helicopter vertical and horizontal velocities , vertical and horizontal displacements , and the rotor angular speed
其中的状态变量包括直升机的水平和垂直速度、水平和垂直位移以及旋翼转速。