How is the specific speed used to predict hydraulic turbine performance?
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How is the specific speed used to predict hydraulic turbine performance?
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- Apply the formulas in designing a hydraulic turbine to select the appropriate type of turbine for the following design considerations:a. Gross head = 200mb. Flow rate = 10m3/s c. Penstock friction losses = 10% of gross headd. Overall Efficiency = 95%e. Coefficient of velocity, Cv = 0.95f. Peripheral coefficient, Φ = 0.46g. Rotational speed = 3200 rpmCompute Ns and net head to validate the answer. Calculate also the diameter of the turbine wheel.A volute centrifugal pump has the following performance data at the best efficiency point: volumetric flow rate Q-0.015 m's Ah - 65 m total head required net positive suction head NPSH- 16 m liquid power impeller speed impeller diameter Evaluate the performance of an homologous pump which operates at an impeller speed of 29.2 rev/s but which develops the same total head Ah and requires the same NPSH. PE- 14000 W N= 58.4 revis D-0.22 mFor a 6.25-inch Model 4075 pump operated at 1160 rpm, if 450 GPM of water is to be delivered, what will be the estimated pump head in ft? HEAD IN FEET 30 25 0 0 0 10 O 6 ft 7.25" (184mm) 20 7.00" (178mm). 6.75" (171mm). 6.50" (165mm)] 15 6.25" (159mm). 5 O 16 ft O 20 ft O 12 ft aco® L/SEC 5 OT 10 Model 4075 FI & CI Series 15 -6-6 ⁰ dº 20 ANA 888 778 25 REQUIRED NPSH do 1160 RPM November 1, 2010 K ・dº- [M 90 do 30 8800 81 1HP(.75KW) DeJ kin do 60% 35 do 50 Curve no. 2175 Min. Imp. Dia. 6.25" Size 5 x 4 x 7.0 40 45 3HP(2.2KW), 2HP(1 5KW) 5HP(1 1KW)> CURVES BASED ON CLEAR WATER WITH SPECIFIC GRAVITY OF 1.0 L 75 150 225 300 375 450 525 600 675 FLOW IN GALLONS PER MINUTE NOWONG FEET 15 12 7 6 2 1 NPSH 758 50 5 HEAD IN METERS 45 586888 KPO 60 40 20 10 LO HEAD IN KILOPASCALS
- for centerifugal , discuss how blade design affects the pump efficiency and induces losses11. A turbine of 9000 B.H.P. is working under a head of 25 m and runs at 100 R.P.M. What will be the type of turbine ? What should be its speed and power, when it is working under a head of [Ans. Francis, 80 and 4610 H.P.J 16 m ? 12. A Kaplan turbine of 100 B.H.P. is working under a head of 5 m and running at 210 R.P.M. The discharge through the tur- bine is 1'80 m³/sec. If now the turbine is allowed to work under a head of 15 m, what would be its new speed, discharge and power ? [Ans. 364 R.P.M., 3.12 m³/sec and 519 B.H.P.] 13. A scale model of 1 is used to determine the design of a turbine to develop 10,000 B.H P. under a head of 9 m of water run- ning at a speed of 100 R.P.M. The head available in the laboratory is of 6 m and overall efficiency is 88%. Calculate: (i) Speed, (ii) Discharge, (ii) Power required by model. [Ans. 816 R.P.M., 770 litre/sec and 54'5 B.H.P.]Page 3 QUESTION 5 A Francis turbine with an overall efficiency of 80% is required to develop 150 kW. It is working under a head of 8 m. The peripheral velocity = 0.36/2gH and the radial velocity of flow is 0.96,/2gH. The wheel runs at 150 rpm and the hydraulic losses in the turbine are 22% of the available energy. Assuming radial discharge, determine 5.1 the guide blade angle, 5.2 the wheel vane angle at the inlet, and 5.3 width of the wheel at the inlet.
- For the figure shown below, what flow rate is required to produce 4,700 HP if the turbine is 72% efficient? D = 3 ft L 3,600 ft f=.026 11 MGD O 16 MGD 20 MGD O 25 MGD Az = 2,300 ft T Minor Loss Kent = 0.8 Kvalve = 5 Kelbow = 0.66 x 3 Kbend = 0.47 Kvalve = 2.2 Kexit = 1.0(Combine Rankine Cycle) Show the details of your solutions with TS Diagrams with correct dimension analysisDiscuss Brayton and Rankine cycles
- What is the proper model flow rate?A propeller turbine has been designed to develop 22,000 kW under a head of 20 m whilst turning 150 revolutions per minute. The relevant data is: hydraulic efficiency 95%; overall efficiency 86%; outer diameter 4.5 m, and diameter of the hub 2 m. Determine the runner vane angles at the hub and at the outer periphery. Assume that the turbine discharges without whirl at exit. B) Determine the runner vane angles at the outer periphery. (10) 39.90° O 15.85° O 27.12 O 21.201 O 32.51° A) Determine the runner vane angles at the hub. (11) 15.85° O 21.20° O 27.12° O 32.51° 39.90°A Kaplan turbine delivering 40 MW works under a head of 35 m and runs at 167 rpm.The hub diameter is 2.5 m and runner tip diameter is 5 m. The overall efficiency is 87%.Determine the blade angles at the hub and tip and also at a diameter of 3.75 m. Also find the speed ratio and flow ratio based on tip velocity. Assume nH = 90%. Inlet blade angle at the tip * O 166.08 140.23 133.67 165.73