290611 Hydraulics

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Description

Examination number 1
Problem number 2
Steam direct-acting pump delivers fluid F - water to a height of H = 10 m. Is the absolute vapor pressure when the steam cylinder diameter D = 180 mm, and the pump cylinder d = 80 mm? Friction losses ignored.
Task number 8
Liquid F - transformer oil is fed into the open upper tank through a vertical pipe length l = 12 m and a diameter d = 60 mm due to the air pressure in the lower closed tank. Determine the air pressure P at which the flow rate will be equal to Q = 6 l / s. Take coefficients of resistance: a valve ξv = 8; enter the pipe ξvh = 0.5; exit to the tank ξvyh = 1. Equivalent roughness of the pipe walls ke = 0.2 mm.
Problem number 17
From the tank A in which is maintained a constant level, the water flows through a cylindrical nozzle diameter d = 25 mm in the tank, from which is discharged into the atmosphere through a short pipe diameter D = 31 mm, equipped with a tap. Identify the largest value of the coefficient of resistance of the crane ξ, where the outflow from the nozzle will be carried out into the atmosphere. The friction losses in the pipe can be disregarded.
h = 42 cm; H = 128 cm.
Problem number 20
Water in an amount of Q = 8,85 m3 / min pumped by a cast iron pipe with a diameter d = 250 mm and l = length of 1300 m with a wall thickness δ = 11,5 mm. The free end of the tube is equipped with a shutter. Determine the time the shutter is closed under the condition that the pressure increase in the pipe due to water hammer does not exceed Dp = 1 MPa. How to increase the pressure at the instant closing of the gate?
Verification work number 2
2. Define the velocity field, the local and average speed
9. What is hydraulic and piezometric slopes, how to define them?
11. What is the main difference between laminar and turbulent flow?
13. What is the Reynolds number, what its physical meaning and practical value?
17. What is the absolute and relative roughness?

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