What is inward flow reaction turbine?
A. The water flows parallel to the axis of the wheel. The water enters at the center of the wheel and then flows towards the outer periphery of the wheel. The water enters the wheel at the outer periphery and then flows towards the center of the wheel.
Which turbine is better impulse or reaction?
The efficiency of the reaction turbine is higher due to blade suction effects. This combined construction has the advantage that both the number of stages is less than a fully reaction turbine, and the efficiency is higher than a fully impulse turbine.
What is inward and outward flow reaction turbine?
Water may flow radially from outwards to inwards or from inwards to outwards. If water flows through the runner from outwards to inwards, turbines will be termed as inward radial flow turbine. If water flows through the runner from inwards to outwards, turbines will be termed as outward radial flow turbine.
What is the main difference between the term of impulse and reaction?
Difference between Impulse and Reaction Turbine
| Comparison | Impulse turbine |
|---|---|
| Degree of reaction | The degree of reaction is zero. |
| Energy conversion | The entire energy is converted into kinetic energy. |
| How it works | The work is done by the change in the kinetic energy of the jet in the impulse turbine. |
Why it is called reaction turbine?
The turbine is driven by the reaction force resulting from the acceleration of gases through the converging blade passage and, hence, the name.
What is the difference between impulse and reaction?
In an Impulse turbine, All hydraulic energy is converted into kinetic energy by a nozzle whereas In a Reaction turbine Only some amount of the available energy is converted into kinetic energy.
What is inward flow?
1 going or directed towards the middle of or into something. 2 situated within; inside. 3 of, relating to, or existing in the mind or spirit.
What is the principle of impulse reaction turbine?
Impulse turbine work on the principle of Newton’s second law as the resulting change in momentum sets buckets and wheel into rotary motion and thus mechanical energy is made available at the turbine shaft. The fluid jet leaves the runner with a reduced energy.
How is power developed by the flow in an impulse turbine?
The power developed by the flow in an impulse turbine is given by the Euler equation: This equation, rewritten in terms of the absolute velocity and the nozzle angle α for maximum utilization, can be shown as: The relative velocity W remains unchanged in a pure impulse turbine, except for frictional and turbulence effects.
What is the degree of reaction in impulse turbine?
By definition, the impulse turbine has a degree of reaction equal to zero. This degree of reaction means that the entire enthalpy drop is taken in the nozzle, and the exit velocity from the nozzle is very high.
What are the advantages of an inward flow reaction turbine?
This is preferred to the outward flow turbine as this turbine does not develop racing. The centrifugal force on the inward moving body of water decreases the relative velocity and thus the speed of the turbine can be controlled easily. Fig. 20.3 shows the components of the inward flow reaction turbine.
Which way does an inward flow reaction turbine discharge?
An inward flow reaction turbine discharges radially and the velocity of flow is constant and equal to the velocity of discharge from the suction tube. Show that the hydraulic can be expressed by:-