旋翼/涡轴发动机动力涡轮联合变转速对性能影响研究

The calculation model of optimal rotor speed and power demand considering flight conditions and the performance analysis model of turboshaft engine with variable speed power turbine were built respectively. Based on these models, the performance analysis method and program of rotor /turboshaft engine power turbine were developed, and the performance analysis under typical flight envelope was carried out for UH60A helicopter and T700 turboshaft engine. The results showed that when the speed of power turbine becames variable, the steady-state matching working line of compressor and high-pressure turbine changed slightly. However, the isentropic efficiency of the power turbine decreased significantly as the speed decreased, indicating that further improvements in its performance were necessary. Compared with the constant speed operation mode, after a completion of a typical flight mission, the coordinated variable speed operation of rotor/turboshaft engine could reduce fuel consumption by nearly 5%.