Following is the data for a hydro-electric development:Net Head =300 mTurbine Output10,000 HP(i) What type of turbine would you suggest?(ii) Assuming the following specific speeds as the suitable ones, whatwould be the nearest synchronous speeds?Ns=24 per jet for a Pelton wheel with two nozzles,Ns80 for a Francis type runner.(b) Which of the two possibilities viz; a twin jet Pelton or a singleFrancis type turbine as described above under (ii) would you favour?Support your arguments in the light of the relative advantages anddisadvantages.(428.58 rpm; 1,000 rpm ; Twin-jet Pelton better)==

Following is the data for a hydro-electric development: Net Head = 300 m Turbine Output = 10,000 HP (i) What type of turbine would you suggest? (ii) Assuming the following specific speeds as the suitable ones, what would be the nearest synchronous speeds ? Ns = Ns = 24 per jet for a Pelton wheel with two nozzles, 80 for a Francis type runner. (b) Which of the two possibilities viz; a twin jet Pelton or a single Francis type turbine as described above under (ii) would you favour? Support your arguments in the light of the relative advantages and

Following is the data for a hydro-electric development: Net Head = 300 m Turbine Output = 10,000 HP (i) What type of turbine would you suggest? (ii) Assuming the following specific speeds as the suitable ones, what would be the nearest synchronous speeds ? Ns = Ns = 24 per jet for a Pelton wheel with two nozzles, 80 for a Francis type runner. (b) Which of the two possibilities viz; a twin jet Pelton or a single Francis type turbine as described above under (ii) would you favour? Support your arguments in the light of the relative advantages and

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Answer The following A twin jet Pelton wheel is required to generate 7500 KW when the available head at a nozzle is 400 m. Assuming generator efficiency of 95% overall wheel efficiency of 80% , coefficient of velocity as 0.98, speed ratio as 0.46, reduction in relative velocity while passing through bucket as 15% and taking that the jet is deflected through 165 by the bucket, the diameter of each jet O 13.69 cm 18.84 cm 20.21 cm 10.54 cm
Hydro electric station is installed to utilise 30 ma/sec of water of a river at a head of 7.5 m. If 85% turbine efficiency can be counted on, (i) is it feasible to develop this power by two turbines with rpm not less than 50, the turbine having specific speed not greater than 540 rpm ? (ii) what type of runner will be used ? (iii) what is the diameter of runner if the speed ratio is 0.85? [(i) N = 156'5 rpm, .. yes (ii) Kaplan (iii) P25 m]
Using data given below, determine the main dimensions and blade angles of a Francis turbine. Net head=65 m, speed%3 700 rpm, BHP= 400. Actual hydraulic efficiency= 94%, overall efficiency= 85%, flow ratio= 0.18, (wheel width at inlet/ wheel diameter at inlet)=0.1, (inner diameter/ outer diameter)= 0.5, assuming constant velocity of flow and radial discharge. Neglect area blocked by blades. Width of the wheel at outlet:
‘The following particulars refer to a two-row velocity-compounded impulse wheel which forms the frst stage of a combination turbine: Steam velocity at nozzle outlet :630 mis Mean blade velocity 125 mls Nozzle angle :16° Outlet angle, first row of moving blades 18 Outlet angle, fixed guide blades 1220 Outlet angle, second row of moving blades :36° Steam flow rate 26kgs ‘The ratio of the relative velocity at outlet to that at inlet is 0.84 for all the blade. Determine ) The velocity of whirl.
‘The following particulars refer to a two-row velocity-compounded impulse wheel which forms the frst stage of a combination turbine: Steam velocity at nozzle outlet :630 mis Mean blade velocity 125 mls Nozzle angle :16° Outlet angle, first row of moving blades 18 Outlet angle, fixed guide blades 1220 Outlet angle, second row of moving blades :36° Steam flow rate 26kgs ‘The ratio of the relative velocity at outlet to that at inlet is 0.84 for all the blade. Determine ) The velocity of whirl. (b) The tangential thrust on the blades.
‘The following particulars refer to a two-row velocity-compounded impulse wheel which forms the frst stage of a combination turbine: Steam velocity at nozzle outlet :630 mis Mean blade velocity 125 mls Nozzle angle :16° Outlet angle, first row of moving blades 18 Outlet angle, fixed guide blades 1220 Outlet angle, second row of moving blades :36° Steam flow rate 26kgs ‘The ratio of the relative velocity at outlet to that at inlet is 0.84 for all the blade. Determine ) The velocity of whirl. () The tangentia thrust on the blades () The axial thrust on the blades. (@) The power developed. (e) The blading efficiency.
For two row velocity compounded simple impulse turbine wheel derive the expressions for Diagram Power and Diagram Efficiency and also prove that : i. (P )max = 8 Cb? ii. ( na )max = Cos'ai
explanation of the performance tests undertaken for a wind turbine. With the options found, give a justified recommendation for the best system.
The following particular refer to a two row velocity compounded Impulse steam turbine (wheel). Steam velocity at Nozzle exit-600 m/sec, Nozzle angle - 16°, Mean Blade velocity = 120 m/sec. Exit angles; first row of moving blades - 18° Fixed guide blades = 22⁰ Second row of moving blades 36° Steam flow rate=5kg/sec. Blade friction coefficient=0.85 Determine (1) Tangential thrust
3. A 90% efficient Francis turbine running at 100 rpm discharges 6m * 3/s of water. The inner runner radius is 1.8 m and the outer periphery of the wheel has a radius of 2.5 m. The blade height is 50 cm. The blade angle beta_{1} is 80 degrees and beta_{2} is 160 degrees Find the vane angle, torque, and the power from the turbine
(2) cislai Using data given below, determine the main dimensions and blade angles of a Francis turbine. Net head=65 m, speed= 700 rpm, BHP= 400. Actual hydraulic efficiency= 94%, overall efficiency= 85%, flow ratio= 0.18, wheel width at inlet/ wheel diameter at inlet=D0.1, inner diameter/ outer diameter= 0.5. Assuming constant velocity of flow and radial discharge. Neglect area :blocked by blades. Vane angle at inlet 27° 39 33° 53 41° 82 52° 56
1) How much power can a HRX Turbine produce daily? Specifications: • 52 meter blades • Average wind speed at 14-16 knots Air density is 1.23 2) Will a HRX Turbine be able to run enough electricity to power a 10,000 square building for a full day?