额定水头

径流式电站水轮机额定水头Hr是决定水轮机基本尺寸的水头，因此也是决定厂房基本尺寸的水头。

Rated water head of power stations without storage is the water head that determines the basic dimension of hydraulic turbine , so is the water head which decides the size of plant construction .

峡江水电站是低水头（额定水头为8.57m）水电站。

Xiajiang hydraulic power station is a low water head station . The rated head is 8.57m .

额定水头的效率峰值对应的工况点N[η（max）]具有可选定性，是效率峰值移动的基准点，它反映了转轮具有较高能量指标和较好的稳定性的共同要求。

The rated head efficiency peak operation point N [ η( max ) ] is taken as the reference point for peak efficiency movement , it reflects the high energy performance and a good stability of a runner , the point is selectable .

对构皮滩水电站水轮机的额定水头、比转速及比速系数、单位流量、单位转速、空化系数、效率、稳定性等逐一进行论述，介绍了基本参数和参数水平。

This paper presents the major parameters of hydraulic turbines one by one , such as rated head , specific rotating speed and specific speed coefficients , unit flow , unit speed , cavitation coefficient , efficiency , stability etc.

由于龙滩电站水头变幅较大，考虑水轮机运行稳定性，建议提高水轮机额定水头或设置可连续运行的发电机最大容量。

In view of the large head variation in Longtan hydropower station and the turbine ′ s operation stability , this paper gives suggestion to raise the rated head of turbine or set a maximum capacity of generator of continuous operation .