0
Draft tube has following purpose :- 1. It makes possible the installation of the turbine above the tail race level without the loss of head.
2. the velocity of water at the runner outlet is very high. By employing a draft tube of increasing cross sectional area, the discharge takes place at a much lower velocity and thus, a part of the kinetic energy that was going as a waste is recovered as a gain in the pressure head, and this increases the efficiency of the turbine.
3.The draft tube prevents the splashing of water coming out of the runner and guides the water to the tail race.
Add your answer:
Earn +20 pts
What turbine does not require draft tube?
Draft tube is used to increase the pressure from the low turbine exit pressure to the pressure of the surrounding to which the fluid is rejected.Only reaction turbines require a draft tube as there is low pressure at the exit of the turbine,where as in an impulse turbine the pressure at the inlet and the exit is essentially the same, which is above the pressure to which the fluid is rejected and thus it require no draft tube.
How does a hydraulic lift work?
A hydraulic lift works by having pressure travel through a tube into another. One tube is smaller forcing air into the larger one in order to push and raise the lift.
Why draft tube is used in francis and kaplan turbine and not in pelton turbine?
The Kaplan turbine is a newer, more revolutionary version of the Francis turbine, which came before it. The draft tube is used so that the turbine does not need to be where the water flow is lowest.
How does a hydraulic gauge work?
Normally using a calibrated bellows or bourdon tube. As pressure is sensed by the device it inflates the tube or bellow which in turn causes the needle to rotate. Pre-seventies pitot and static systems on aircraft use this very technology to relay information like true air speed to the pilots.
How do you make a simple hydraulic?
Take a tube, put a piston in it, seal off both ends of the tube, and use a liquid, or gas to put pressure in and remove pressure from the tube. As the fluid or gas goes in the tube, the pressure pushes the piston out. As the pressure is released, the piston can recede.
What turbine does not require draft tube?
Draft tube is used to increase the pressure from the low turbine exit pressure to the pressure of the surrounding to which the fluid is rejected.Only reaction turbines require a draft tube as there is low pressure at the exit of the turbine,where as in an impulse turbine the pressure at the inlet and the exit is essentially the same, which is above the pressure to which the fluid is rejected and thus it require no draft tube.
What is the function of draught tube?
A draft tube is used to transform water into energy. It is found in the piping system of jets, dams or anywhere turbines help with difficult mechanical work.
What will happen if a uniform cross section draft tube is used instead of a conical draft tube?
In a Reaction turbine,the Draft Tube is used to reduce the exit velocity loss in order to minimize the exit energy loss. The conical Draft tube ensures this as the diverging area ensures a lower velocity at draft tube exit (since acc. to Q = VxA; the continuity principle,an increase in area renders a decrease in velocity) than its entry point ( at runner exit). A straight (uniform c/s draft tube) draft tube will impart no reduction in the magnitude of exit velocity and thus the employment of a draft tube at the runner exit will be futile.
What is used To allow pressurized gases To To vent from the crankcase?
Draft tube or pcv system.Draft tube or pcv system.
A hydraulic system uses a to transmit pressure?
A pipe or tube.
What are the types of draft tube?
two types of draft tube 1. conical type-> for low powered units 2. elbow type-> used with most turbine installation
Why forebay is used in hydroelectric power plant?
draft tube
How does a hydraulic lift work?
A hydraulic lift works by having pressure travel through a tube into another. One tube is smaller forcing air into the larger one in order to push and raise the lift.
What draft tube in hydro electric power plant?
This is a water conducting system part which provide the path for out let water of turbine that is called draft tube. Er.C.R.Meena Assistant Director (Tech.)
What is draft tube in hydro electric power plant?
This is a water conducting system part which provide the path for out let water of turbine that is called draft tube. Er.C.R.Meena Assistant Director (Tech.)
How do you measure hydraulic head?
Hydraulic head is typically measured using a piezometer, which consists of a port that connects to a water-filled tube. The water level in the tube relative to a reference point is a direct measure of hydraulic head. Alternatively, hydraulic head can be calculated indirectly using pressure sensors and the fluid's density in scenarios where direct measurement is difficult.
What is the purpose of the pollination tube that forms after pollination?
the purpose of the of pollen tube is to fuse or join with the ovules to cause fertilization.
