A Pelton turbine with a Net Head of Ho=550 m and Volumetric Flow Rate of 0,8 m3/sec is connected to a 4 pole alternator which generates alternating current with n=1844 rpm. Nozzle velocity Co=143,3 m/s and turbine operates at maximum hydraulic efficiency. Determine the Do diameter (m) of the impellor (runner). Do= ? (m) Yanıt:
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- A Kaplan turbine runner is to designed to develop 10000 hp, the net head is 5.5 m. Assume that the speed ratio is 2.09 and the flow ratio is 0.68, and the overall efficiency is 60%. The diameter of the boss is 1/3 rd of the diameter of the runner . The discharge is ؟A Kaplan turbine runner is to designed to develop 10000 hp, the net head is 5.5 m. Assume that the speed ratio is 2.09 and the flow ratio is 0.68, and the overall efficiency is 60%. The diameter of the boss is 1/3 rd of the diameter of the runner . The diameter of the runner is *A propeller turbine develops 12,000hp, and rotates at 145rpm under a head of 20m. The outer and hub diameters are 4m and 1.75m, respectively. Calculate the inlet and outlet blade angles measured at mean radius if overall and hydraulic efficiencies are 85% and 93%, respectively. Show schematic diagram and provide solutions.
- A multi stage pump is required to deliver of 2 l/s water against a maximum discharge head of 240 m. The diameter of radial bladed impeller should not be more than 15 cm. Assume a speed of 2800 rpm. Determine the impeller diameter, and power. Overall efficiency is 0.7.A Kaplan turbine working under a head of 81 5 m is dis-charging 295 m%/sec. of water at 75 R.P.M. and developing 38,000B.H.P.The runner dia is 7 m and boss diameter is 3 m.Determine (2) the inlet and outlet blade angles of runner, (i)mechanical efficiency and (in) overall efficiency.Assume hydraulic efficiency as 94%It is desired to construct a hydraulic turbine for a hydraulic power plant to operate under the following conditions: discharge Q = 3.5 m3/s of water, the available net head = 290 meters, the hydraulic efficiency = 0.8, the rotating speed = 300 rpm. A Pelton wheel impulse turbine was selected with the following specifications: the bucket angle b2 = 160°, the coefficient of velocity for the nozzle is 0.98 and assume the friction coefficient k = 0.2. Determine the following:Jet Diameter to Wheel diameter ratio, dj/Dw. The Specific Speed in M.K.S., Ns.The computed head coefficient ϕ.The brake horsepower. The required number of Jets. The Pelton wheel diameter in meters.
- A turbine of the Francis type operates with a head of 200 m and flow rate of 3 m3/s.The peak efficiency occurs at a head coefficient CH of 9, a flow coefficient CQ of 0.3, and apower coefficient CP of 2.5 (as defined in Section 12.7). Estimate the size of the machine,the maximum power produced, and the speed.A Pelton wheel is to be designed for a head of 400 m when running at 500 rpm. The Pelton wheel develops 10000kW shaft power. The blade angle at outlet is 15º. The relative velocity of water is reduced by 5% by moving over the buckets. Velocity of the buckets = 0.45 times the velocity of the jet, overall efficiency = 0.8 and coefficient of the velocity = 0.98. If the Pelton wheel is provided with three nozzle, find (i) The diameter of jet (ii) Total flow rate and the force exerted by a jet on the bucketsA hydroelectric power plant is being designed. The gross head from the reservoir to the tailrace is 1065 ft, and the volume flow rate of water through each turbine is 203,000 gpm at 70°F. There are 12 identical parallel turbines, each with an efficiency of 95.2 percent, and all other mechanical energy losses (through the penstock, etc.) are estimated to reduce the output by 3.5 percent. The generator itself has an efficiency of 94.5 percent. Estimate the electric power production from the plant in MW
- A two stage centrifugal pump is designed to discharge water at a total head of 70 m with an overallefficiency of 0.76. The pump runs at 2331.6 rpm. The actual head developed (per stage) is 65% ofthe theoretical head. The flow at the inlet is pure radial. The impeller at the exit has a diameter of D2=0.219m and a width b2=0.0216m .The outlet blade angle is ?= 28°. Determine:1. The flow rate of the pump.2. The output power of the two stage centrifugal pump. Take ρ= 1000kg/m^3g=9.81 m^2/s[5] A Francis turbine operates at its maximum efficiency point at h0 = 0.94, corresponding to a power specific speed of 0.9 rad. The effective head across the turbine is 160 m and the speed required for electrical generation is 750 rev/min. The runner tip speed is 0.7 times the spouting velocity, the absolute flow angle at runner entry is 70 deg from the radial direction and the absolute flow at runner exit is without swirl. Assuming there are no losses in the guide vanes and the mechanical efficiency is 100%, determine (i) the turbine power and the volume flow rate; (ii) the runner diameter; (iii) the magnitude of the tangential component of the absolute velocity at runner inlet; (iv) the axial length of the runner vanes at inlet.A pump is being utilized to deliver a flow rate of 500 li/sec from a reservoir of surface elevation of 65 m to another reservoir of surface elevation 95 m.The total length and diameter of the suction and discharge pipes are 500 mm, 1500 m and 30 mm, 1000 m respectively. Assume a head lose of 2 meters per 100 m length of the suction pipe and 3 m per 100 m length of the discharge pipe. What is the required horsepower of the pump? **provide complete solution using bernoullis equation..provide illustration with labels like datum line and such** Show all formula derivation