The results show that , the ratio of the output power of vaneless counter-rotating turbine can reduce 2.6% at the same turbine efficiency when the low pressure rotor curves positive.
First opens the by-pass valve counter-pressure, then operates the valve, latter opens the hydraulic turbine.
先开启旁通阀平衡压力，再开阀，后开启水轮机。
3
The counter-rotating turbine design has been successfully applied in E3 program by P&W Company. The design characteristics of the high-pressure turbine stage was analyzed and discussed in this paper.