Though the range of water head is not too wide, maximum efficiency of Goupitan hydroelectric plant is very high and weighted efficiency focus on rated head wide range in flow. 尽管构皮滩电站的水头变幅并不大,但最高效率要求较高,而且设计水头附近横向权值大。
A high pressure rated cementing head has been designed and manufactured to meet the special needs of cementing operations for deep and ultra-deep wells. 针对深井、超深井的固井特点及其特殊要求,研制了系列新型高压水泥头。
Motorola scored a coup yesterday with the recruitment of a highly rated executive to head its mobile phone business, which will be spun out of the US electronics group next year. 摩托罗拉(Motorola)昨日取得出乎预料的成功,它招聘到一位得到很高评价的经理人执掌其移动电话业务,该项业务明年将被分拆出这家美国电子集团。
The Structure and Operation Characteristics of Francis Turbine with High Rated Head 高水头混流式水轮机的结构及运行特性
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. 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。
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. 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。
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. 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。
Selection of Turbine ′ s Rated Head for Hydropower Stations 论水电站水轮机设计水头选择
For the low head hydro power station, the diameter of turbine will be relatively large, and the rated speed will be very low as well if the rated net head is lower than 10m. 在低水头电站中,设计水头在10m以下时,水轮机的转轮直径相对较大,而机组的转速相对很低。NET开发平台环境下进行开发。
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. 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。
Development and Application of A High Pressure Rated Cementing Head 新型高压水泥头的研制