It is located at the exit of the nozzle preceding the runner buckets (Fig.2.2). Consequentupon a sudden rejection of load and a decrease in the demand of water, the needle quicklydecreases the area of flow. Otherwise the turbine would start racing. But if...[继续阅读]

    Runner is a cylindrical disk mounted on a shaft on the periphery of which a number ofbuckets are fixed equally spaced, as shown in Fig.2.3.The blades, also called buckets, look like twin hemi-ellipsoided cups joined in the middleby means of a ridge. This ...[继续阅读]

    The Pelton turbine can have either a horizontal axis or a vertical axis layout. If the axis ishorizontal, the runner can be fed either by one nozzle or two nozzles. Sometimes the turbinemay have twin runners placed side by side or alternatively, the gener...[继续阅读]

    To feed water to these nozzles, a distributor is provided which is a pipe attached to theend of penstock. For a two-nozzle horizontal shaft layout, the distributor is Y-shaped withbends being attached to the two arms of the bifurcate for mounting the inje...[继续阅读]

    The functions of the casing are:① To enclose the turbine runner and jets so that the water does not spill;② To provide recesses for mounting the injectors;③ To provide recesses for mounting the bearing;④ To transmit the load of the machine to the foundati...[继续阅读]

    Even after the amount of water striking the buckets is completely stopped, the runnergoes on rotating for a very long time due to inertia. To stop the runner in a short time, a smallnozzle is provided which directs the jet of water on the back of bucket w...[继续阅读]

    1. With a neat sketch explain the parts of a Pelton turbine.2. State the purposes of the following Pelton turbine components:·Injector·Servomotor·Deflector·Casing·Braking jet3. Describe the characteristics of a Pelton turbine runner....[继续阅读]

    [1] Magdy Abou Rayan, Nabil H. Mostafa, Purage Ohans. Textbook of Machines Hydraulic[M]. Zagazig: Zagazig University, Dept. of Mechanical Engineering, 2009.[2] Arne Kjlle. Hydropower in Norway-Mechanical Equipment [M]. Trondheim:Norwegian University of Sc...[继续阅读]

    access door 人孔门；检修门；通道门accommodate 容纳；使适应；供应；调解adhesion 黏附；黏附力annular area 环形区域annular pipe 环形管area of flow 过流面积arm 支臂available head 有效水头axial thrust 轴向推力baffle 挡板bearing 轴承bend 弯管bifurcate...[继续阅读]

    Developed in 1919 by Gilbert Gilkes as a modification of the Pelton wheel, the Turgo hassome advantages over Francis and Pelton designs for certain applications.Firstly, the runner is cheaper to make than a Pelton wheel. Secondly, it doesn’t need anairtig...[继续阅读]