2-121 The rotating parts of a hydroelectric power planthaving power capacity W have a rotational synchronous speedn. The weight of the rotating parts (the hydroturbine and itselectric generator) is supported in a thrust bearing havingannular form between D and d diameters as sketched.The thrust bearing is operated with a very thin oil film ofthickness e and dynamic viscosity μ. It is assumed that theoil is a Newtonian fluid and the velocity is approximated aslinear in the bearing. Calculate the ratio of lost power in thethrust bearing to the produced power in the hydraulic powerplant. Use W = 48.6 MW, μ = 0.035 Pa·s, n = 500 rpm,e = 0.25 mm, D = 3.2 m, and d = 2.4 m. (Neglect gravitational effect)OilDFIGURE P2-121(load)@const.Oil

We have a thrust bearing supporting the rotating parts of a hydroelectric power plant. The goal is…

Answered: 2-121 The rotating parts of a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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The rotating parts of a hydroelectric power plant having power capacity W . have a rotational synchronous speed n .. The weight of the rotating parts (the hydroturbine and its electric generator) is supported in a thrust bearing having annular form between D and d diameters as sketched. The thrust bearing is operated with a very thin oil film of thickness e and dynamic viscosity ? . It is assumed that the oil is a Newtonian fluid and the velocity is approximated as linear in the bearing. Calculate the ratio of lost power in the thrust bearing to the produced power in the hydraulic power plant. Use W . = 48.6 MW, ? = 0.035 Pa⋅s, n . = 500 rpm, e = 0.25 mm, D = 3.2 m, and d = 2.4 m.
A square block has 320 mm bottom sides dimensions, weighing W is 1.4 kN on an edge slides down an incline angle 0 is 20° on a film of oil 6 mm thickness, as shown below. Assuming a linear velocity profile in the oil. The viscosity of the oil is 0.009 Pa.s. W y Determine the force acting on the block, F. What is the velocity of the block, V?
1. A shaft with 120 mm diameter and 200 mm longth rotatos in the cylindor at 40 rpm, the distance between the cylinder and the shaft is 0.04 mm and is fillod with oil. Dynamic viscosity of the oil is p = 0.04 Ns/m2. Find tho moment to turn the shaft. 0.04 mm M 120 mm L=200 mm Oil p-0.04 Nsim? 2. A 0.4 mm diameter glass tube is inserted into kerosene at 20°C (p=804kg/m³). The contact angle of kerosene with a glass surface is 26°. Determine the capillary rise of kerosene in the tube. (The surface tension of kerosene-glass at 20'C is 0.028 N/m) 3. A liquid which is compressed in a cylindor has a volume of 1200 cm' at 1.2 MN/m² and 990 cm' at 2 MN/m?. What is the comprossibility of the liquid (K) ? 4. Find capillory rise (h) betwoen two concentric tubos that have radius of , and n (contact angle is 0, specific woight of fluid is y).
The Question is 50 mm-diameter and 100 mm-height cylinder is rotating with constant angularspeed of w= 300 rad/sec in a gap whose thickness varies linearly from 1 mm to 10 mm. The gap is filled with a fluid whose viscosity is 0.2 Ns/m2. Find the required torque that should be applied to the cylinder in order to maintain its motion.

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