A simple single-stage ie is being sign to produce powe lowing through a tube as in Fig. 4. We approximate both the stator and rotor as thin (bent sheet metal). The 16 stator (upstream) blades have ẞs1 = 0° and ẞst = 50.3°, where subscripts "sl" and “st” mean stator leading edge and stator trailing edge, respectively. At design conditions, the axial flow speed is 8.31 m/s, the rotor turns at 360 rpm, and it is desired that there be no swirl downstream of the turbine. At a radius of 0.324 m, calculate angles Bri and ẞrt (rotor leading and trailing edge angles), sketch what the rotor vanes should look like, and specify how many rotor vanes there should be.

A simple single-stage ie is being sign to produce powe lowing through a tube as in Fig. 4. We approximate both the stator and rotor as thin (bent sheet metal). The 16 stator (upstream) blades have ẞs1 = 0° and ẞst = 50.3°, where subscripts "sl" and “st” mean stator leading edge and stator trailing edge, respectively. At design conditions, the axial flow speed is 8.31 m/s, the rotor turns at 360 rpm, and it is desired that there be no swirl downstream of the turbine. At a radius of 0.324 m, calculate angles Bri and ẞrt (rotor leading and trailing edge angles), sketch what the rotor vanes should look like, and specify how many rotor vanes there should be.

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

See similar textbooks

Similar questions

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
‘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. () The tangentia thrust on the blades () The axial thrust on the blades. (@) The power developed. (e) The blading efficiency.
Problem (5.1) An impulse turbine is supplied with steam at a pressure of 1.6 MPa and temperature of 250°C. The back pressure is 0.012 MPa. Nozzle efficiency is 0.9. Blade velocity coefficient K=0.8, mechanical efficiency=0.9, nozzle angle =20°. Symmetrical blades with angle 30°. Find the revolution per minute if the mean diameter of wheel is 75 cm, the blade efficiency, axial thrust per kg steam, exit loss and the stage efficiency.
3.9 A Kaplan turbine produces 16000 kW under a head of 20 m, while running at 166 rpm. The diameter of the runner is 4.2 m while the hub diameter is 2 m, the discharge being 120 m/s. Calculate (1) the turbine efficiency, (2) specific speed, (3) the speed ratio based on the tip diameter of the blade, and (4) the flow ratio. (78%, 497, 1.84, 0.48)
Q. A single stage impulse rotor has a blade ring diameter of 57.5 cm and rotates at a speed of 10,000 r.p.m. The nozzles are inclined at 20o to the direction of motion of the blades and the velocity of the issuing steam is 1,050 m/sec. Determine the inlet blade angle. Assume a friction coefficient of the blading equal to 0.85 and that the inlet and outlet angles are equal. Find also: (a) the power developed at the blades for a steam supply of 1,350 kg per hour (b) the diagram efficiency, and (c) the loss of kinetic energy due to blade friction
/ The following particulars refer to a two-row velocity-compounded impulse wheel which forms the first stage of a combination turbine: Steam velocity at nozzle outlet 1630 mis Mean blade velocity 1125 mls Nozzle angle :16° Outlet angle, first row of moving blades 18 Outlet angle, fixed guide blades inr Outlet angle, second row of moving blades :36° Steam flow rate 126kgs “The ratio of the relative velocity at outlet to that at inlet is 0.84 for all the blade. Determine @) The velocity of whirl.
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
5.16.| For a centrifugal compressor rotating at 2500 rpm, find the compression ratio for the following specifications. T = 300 K; nst (volumetric flow rate) = 1.25 m/s and t (the thickness of the flow section at the = 0.85; r, = 0.55; ra = 0.015; B, 60°, exit) =0.15 m.
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]
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
(2) a fou-cylinder, 2.4 liter engine operates on a four-stroke cycle at 3200 r.p.m. the compression ratio is 9.4:1, the connecting rod length r = 18 cm, and the bore and stroke are related as S = 1.06 B. calculate :- 3 (a) clearance volume of one cylinder in cm³,L, and in ³. (b) Bore and stroke in cm and in. (c) Average piston speed in m/seca 1 ft/sec