4 m w? 20 m/s 50 cm P7.111 Rod, L= 50 cm U = 12 m/s Hinge
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A smooth wooden sphere (SG = 0.65) is connected by a
thin rigid rod to a hinge in a wind tunnel, as in Fig.
Air at 20°C and 1 atm flows and levitates the sphere.
(a) Plot the angle θ versus sphere diameter d in the range
1 cm≤ d≤15 cm. (b) Comment on the feasibility of this
configuration. Neglect rod drag.
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- please find minimum pumping power? First tube lenght= 20m first tube diameter=6cm second tube lenght= 35m second tube diameter=4cm water height= 30m flow=22Lt/second sharp edge loss = 0.5 g=9.81m/sn2, ε=0.00026m, μ=1.139x10-3kg/m.snProvide solutions A penstock with a diameter of 4 ft and length of 225 ft carries water (γ = 62.4 lbf/ft3) through a 200 ft drop from a reservoir to a turbine. The penstock entrance is 10 ft below the water surface. The flow rate through the system is 500 cfs and water exits the turbine in a free jet with a velocity of 9 ft/s. The Darcy-Weisbach friction factor for the penstock is 0.01. Flow is turbulent and head losses at the entrances and exits of the penstock and turbine are negligible. (a) Draw the hydraulic grade line and energy grade line. Label transitions points with the height change using symbols (e.g. hL for pipe head loss) (b) Determine the head delivered to the turbine by the water in ft.(c) If the turbine and generator have a combined efficiency of 80%, determine the power in hp generated by the system.A group of engineers is designing a new hydroturbine by scaling up an existing one. The existing turbine (turbine A) has diameter DA = 1.50 m, and spins at n.A = 150 rpm. At its best efficiency point, V.A = 162 m3 /s, HA = 90.0 m of water, and bhpA = 132 MW. The new turbine (turbine B) will spin at 120 rpm, and its net head will be HB = 110 m. Calculate the diameter of the new turbine such that it operates most efficiently, and calculate V.B and bhpB.
- A pump operates on a head of 35 m, delivering 80 L/s of I water at 80% efficiency. The pump is driven by a diesel engine by means of a chain and sprocket with a service factor of 1.4. If the horsepower per strand is 28, find the approximate number of strands needed: (Ans. 2)The date for a certain installation are as follows Net Head = 454 m, BP = 57,200 bkw, n = 750 rpm, ηT = 90%. What type of turbine was used? A. Impulse turbine B. Kaplan turbine C. Propeller turbine D. Francis turbineAn electric utility decides to add 50 MW of wind generation to its system. If the individual units are to be rated at 2 MW in a 13-m/s wind at standard conditions and have efficiencies Cp = 0.32, ηm = 0.94, and ηg = 0.96, what is the required swept area of each rotor?
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