140211 Hydraulics Option 15

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Uploaded: 17.03.2013
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Description

Task 1.15
To crimp the water underground pipeline (leak testing) is used manual piston pump. Determine the volume of water (modulus K = 2,000 MPa) to be pumped into the pipeline to increase the overpressure therein from 0 to 1.0 MPa. Read the pipeline absolutely rigid. Pipe dimensions: length L = 500 mm, diameter d = 100 mm. What is the force on the handle of the pump at the last moment of pressing, if the diameter of the pump piston DH = 40 mm, and the ratio of linkage arms a / b = 5.
Task 2.15
Determine resistance coefficients dimensional nozzle diameter d, mounted in a pipe of diameter D, and the venturi comprised of the same nozzle diameter d and diffuser. The coefficients of resistance defined as the ratio of the total pressure loss in the velocity head in the pipeline. Given the diameter ratio D / d = 2. Take the drag coefficient: Nozzle ξs = 0.05; diffuser ξdif = 0.15 (both factors include the velocity in the narrow cross-section) at the same flow rate in the tube V = 3 m / s. When deciding to take into account the loss of pressure in the sudden expansion at the nozzle exit.
Task 3.15
When testing the model hydraulic turbine nozzle diameter d0 = 65 mm were produced by the following measurements: the water pressure in the general part of the nozzle (diameter D = 160 mm) P1 = 0.9 MPa; Q = flow rate 96 l / s; jet diameter dc = 55 mm. With the power of the dynamometer measured the impact of the jet on the obstruction F = 3,88 kN (drive set to the normal jet). Determine the flow factor μ and ξ resistance in two different ways.
Task 4.15
Determine the height of the marginal oil suction pump feeding Q = 0,2 l / s from the condition of his bezkavitatsionnoy work, considering that the absolute pressure in front of the pump should be P 30 kPa. When deciding to accept the length of the suction pipe l = 5 m, diameter d = 20 mm, oil density ρ = 900 kg / m3 and a kinematic viscosity ν = 1 Cm. The atmospheric pressure corresponds to 750 mmHg Resistance of the input filter and velocity head at the pump inlet neglected.
Task 5.15
Centrifugal pump characteristic is described by the equation Hk = H0 - k1Q2, fluid pumping into the pipeline, the need for which the pressure is proportional to the square of the flow rate: Npotr = k2Q2. Determine the feed pump and pressure if H0 = 5 m, k1 = k2 = 0,05 x 106 c2 / m5. What will be the pump flow and pressure, if the frequency of rotation and doubled twice to increase the resistance of the pipeline, ie k2 = 0,1 x 106 C2 / M5.

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