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In reaction turbines, the draft tube is used
  • a)
    for the safety of the turbine
  • b)
    to convert the kinetic energy of flow by a gradual expansion of the flow cross-section
  • c)
    to destroy the undesirable eddies
  • d)
    for none of the above purposes
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In reaction turbines, the draft tube is useda)for the safety of the t...
The draft tube has two purposes as follows
1. It permits a negative or suction head to be established at the runner exist, thus making it possible to install the turbine above the tail race level without loss of head.
2. It converts a large proportion of velocity energy rejected from the runner into useful pressure energy. i.e. acts as a recuperator of pressure energy.
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Most Upvoted Answer
In reaction turbines, the draft tube is useda)for the safety of the t...
Understanding the Role of the Draft Tube in Reaction Turbines
The draft tube is a crucial component in reaction turbines, serving a specific purpose that enhances the efficiency of the turbine's operation.
Purpose of the Draft Tube
- The primary function of the draft tube is to convert the kinetic energy of the flow into pressure energy. This is achieved through a gradual expansion of the flow cross-section.
How It Works
- As water exits the turbine, it possesses a significant amount of kinetic energy. The draft tube is designed to slow down this flow gradually.
- By expanding the cross-sectional area, the velocity of the water decreases, which allows the kinetic energy to transform into pressure energy.
- This pressure energy is crucial as it maintains continuous flow and ensures that the turbine operates efficiently.
Benefits of the Draft Tube
- Improved Efficiency: The conversion of energy types minimizes energy losses and enhances overall turbine efficiency.
- Reduced Eddies: While the primary purpose is energy conversion, the draft tube also helps in reducing undesirable eddies, leading to smoother flow and improved performance.
- Safety and Stability: Although not its primary function, a well-designed draft tube contributes to the safety and stability of the turbine operation.
Conclusion
In summary, the draft tube in reaction turbines plays a vital role by converting kinetic energy into pressure energy through gradual flow expansion. This process not only enhances efficiency but also contributes to the smoother operation of the turbine.
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In reaction turbines, the draft tube is useda)for the safety of the turbineb)to convert the kinetic energy of flow by a gradual expansion of the flow cross-sectionc)to destroy the undesirable eddiesd)for none of the above purposesCorrect answer is option 'B'. Can you explain this answer?
Question Description
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