PROBLEM: A double-overhung impulse-turbine installation is to develop 15,000 bkW at 257 rpm under a net head of 340 m. Determine: a. Specific Speed, N,. b. Wheel pitch diameter, D, c. The wheel diameter D, d. The approximate Jet Diameter Drenared bu: ENCR IDO R MAGAY

PROBLEM: A double-overhung impulse-turbine installation is to develop 15,000 bkW at 257 rpm under a net head of 340 m. Determine: a. Specific Speed, N,. b. Wheel pitch diameter, D, c. The wheel diameter D, d. The approximate Jet Diameter Drenared bu: ENCR IDO R MAGAY

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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1- A double jet of Pelton turbine driven by double nozzles to produce (4250 kw) to the shaft of an electrical generator when running at (400 rpm). The height of (180 m). wheel diameter is (1450 mm). The velocity of relative= 0.9 of jet velocity. If the angle of bucket is (165'), determine: a) Hydraulic efficiency b) Diameter of the jet
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
2. A centrifugal pump consists out of an impeller, diffuser and casing and is powered by 300 kW (shaft power) and rotates at 96.3 rad/s. The flow rate generated by the machine is54.7 Kilo-litres/min. The impeller blade inlet angle and width is 23° and 180 mmrespectively. The blades occupy 12% of the impeller area and the water is assumed toenter the impeller radially. Suction and delivery pipes are equal in size. Determine:2.1. The impeller inlet (i) diameter and inlet blade velocity. (Hint - Substitution: Vfi in terms of Di and Ui in terms of Di both sub into Tan of Blade inlet angle, only unknown is then solving for Di2) 2.2 If the pump has a mechanical efficiency of 80%, calculate the blade velocity at outlet (Uo) and outlet whirl velocity Vwo. Assume the blade exit angle equal to the guide vane angle. (Hint - Substitution: Write Vwo in terms of Uo sub in Euler equation only unknown then is solve for Vwo 2.3 Impeller outer diameter. 2.4 If the flow through velocity is consistent…
Ans. [391.67 kW, 61.13 %] Problem (5.4) A nozzle in an impulse turbine delivers 1 kg/s steam to a set of blades moving at 200 m/s. The nozzles are inclined at an angle of 16° to the plane of the wheel. The blade velocity coefficient is 0.72, calculate the blade efficiency, work done and also estimate the energy V?. lost in the blades as; m° (-2).Take the blade angles at inlet and 2 outlet =25°. Ans. [76%,105 kW, 27.072 kW]
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A Kaplan turbine working under a head of 43 m deve-lops 15,400 B.H.P. The dia of theboss is 0"3 times the dia ofrunner. Determine the speed and dia of runner, if speed ratio is2, flow ratio as 0-65 and overall efficiency as 91%.
‘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.
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Uz な、以う0 Vrz VF = Vz Ure Maxe Dr. Ayser Muneer Turbomachines Example (5-2) An inward flow reaction turbine is supplied with water at a rate of (600 Vsec) with a 3 velocity of flow of (2 m/sec). the velocity of periphery and velocity of whirl at inlet are 24 m/sec and 18 m/sec respectively. Assuming radial discharge at outlet and the velocity of flow to be constant, find; 1- Vane angle at inlet, and 2- Head of water on the wheel. V Solution Vn Q = 0.6 m/sec, Vn=2m/sec, uj=24 m/sec, Vu=18m/sec, V1=Vr2 m/sec
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28. A centrifugal air compressor compresses 200 cfm from 12 psia to 90 psia. The initial specifie volume is 12.6 and final specific volume is 3.25 If the inlet suction lirfe is 4" I.D. and the discharge line is 2.5" I.D. Determine ft-lb (a.) The change in flow energy between the boundaries in- min Ib (b.) the mass flow rate in and min (c.) the change in velocity in fps.