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Considering the variation of static pressure and absolute velocity in an impulse stream turbine across one row of moving blades,
- a)both pressure and velocity decrease
- b)pressure decreases but velocity increases
- c)pressure remains constant, while velocity increases
- d)pressure remains constant, while velocity decreases
Correct answer is option 'D'. Can you explain this answer?
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Considering the variation of static pressure and absolute velocity in ...
The diagram shows that static pressure remains constant, while velocity decreases.
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Considering the variation of static pressure and absolute velocity in ...
Explanation:
In an impulse steam turbine, the flow of steam passes through a series of moving blades. The variation of static pressure and absolute velocity across one row of moving blades can be explained as follows:
Pressure Distribution:
- As the steam passes through the stationary blades (nozzles) of the turbine, its pressure drops significantly due to the expansion of steam.
- This drop in pressure occurs because the steam gains kinetic energy and its pressure energy is converted into kinetic energy during the expansion process.
- Therefore, the static pressure decreases across the row of moving blades.
Velocity Distribution:
- When the steam passes through the stationary blades (nozzles), its velocity increases due to the expansion of steam.
- As the steam passes through the moving blades, it experiences a change in direction, causing a drop in its absolute velocity.
- The change in direction of the steam is due to the impulse provided by the moving blades.
- Therefore, the absolute velocity decreases across the row of moving blades.
Conclusion:
Based on the above explanations, we can conclude that in an impulse steam turbine:
- The static pressure decreases across one row of moving blades.
- The absolute velocity also decreases across one row of moving blades.
Option D: The pressure remains constant, while the velocity decreases is the correct answer.
In an impulse steam turbine, the flow of steam passes through a series of moving blades. The variation of static pressure and absolute velocity across one row of moving blades can be explained as follows:
Pressure Distribution:
- As the steam passes through the stationary blades (nozzles) of the turbine, its pressure drops significantly due to the expansion of steam.
- This drop in pressure occurs because the steam gains kinetic energy and its pressure energy is converted into kinetic energy during the expansion process.
- Therefore, the static pressure decreases across the row of moving blades.
Velocity Distribution:
- When the steam passes through the stationary blades (nozzles), its velocity increases due to the expansion of steam.
- As the steam passes through the moving blades, it experiences a change in direction, causing a drop in its absolute velocity.
- The change in direction of the steam is due to the impulse provided by the moving blades.
- Therefore, the absolute velocity decreases across the row of moving blades.
Conclusion:
Based on the above explanations, we can conclude that in an impulse steam turbine:
- The static pressure decreases across one row of moving blades.
- The absolute velocity also decreases across one row of moving blades.
Option D: The pressure remains constant, while the velocity decreases is the correct answer.
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Considering the variation of static pressure and absolute velocity in an impulse stream turbine across one row of moving blades,a)both pressure and velocity decreaseb)pressure decreases but velocity increasesc)pressure remains constant, while velocity increasesd)pressure remains constant, while velocity decreasesCorrect answer is option 'D'. Can you explain this answer?
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