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...[繼續閱讀]

    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 ...[繼續閱讀]

    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...[繼續閱讀]

    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...[繼續閱讀]

    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...[繼續閱讀]

    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...[繼續閱讀]

    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....[繼續閱讀]

    [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...[繼續閱讀]

    access door 人孔門；檢修門；通道門accommodate 容納；使適應；供應；調解adhesion 黏附；黏附力annular area 環形區域annular pipe 環形管area of flow 過流面積arm 支臂available head 有效水頭axial thrust 軸向推力baffle 擋板bearing 軸承bend 彎管bifurcate...[繼續閱讀]

    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...[繼續閱讀]