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In an impulse turbine, the pressure drops
- a)Only in the nozzles
- b)Only in the moving blades
- c)Only in the fixed blades
- d)Both in fixed and in moving blades
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In an impulse turbine, the pressure dropsa)Only in the nozzlesb)Only i...
In impulse turbine pressure drop takes place only in the nozzle. There is no pressure drop either in moving or in fixed blades. The pressure in the moving and fixed blades remains constant.
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In an impulse turbine, the pressure dropsa)Only in the nozzlesb)Only i...
Pressure Drop in an Impulse Turbine
Introduction:
An impulse turbine is a type of steam turbine used in power plants and other industries to convert the kinetic energy of a high-pressure steam into mechanical work. It operates on the principle of the impulse reaction, where a high-velocity jet of steam is directed onto the blades of the turbine rotor, causing it to rotate.
Pressure Drop:
The pressure drop in an impulse turbine occurs primarily in the nozzles. The nozzles are fixed, stationary components that serve the purpose of channeling the high-pressure steam into high-velocity jets. These jets then impinge on the moving blades, causing them to rotate.
Nozzles and Pressure Drop:
The pressure drop in an impulse turbine primarily occurs in the nozzles due to the conversion of pressure energy to kinetic energy. The nozzles are designed to accelerate the steam to a high velocity by increasing its kinetic energy. This acceleration is achieved by creating a convergent-divergent nozzle geometry, where the steam passes through a converging section followed by a diverging section.
Converging Section:
In the converging section of the nozzle, the steam flow area decreases, leading to an increase in velocity and a corresponding decrease in pressure. This decrease in pressure is due to the conversion of pressure energy into kinetic energy.
Diverging Section:
In the diverging section of the nozzle, the steam flow area increases, causing the velocity to decrease and the pressure to increase. However, the pressure in the diverging section does not reach the same level as the inlet pressure. This is because some of the pressure energy has been converted into kinetic energy in the converging section.
Impact on Moving Blades:
Once the high-velocity jets of steam leave the nozzles, they impinge on the moving blades of the turbine rotor. The impact of the steam on the blades causes a change in momentum, resulting in the rotation of the rotor. However, the pressure drop in the moving blades is relatively small compared to that in the nozzles.
Conclusion:
In an impulse turbine, the pressure primarily drops in the nozzles due to the conversion of pressure energy into kinetic energy. The pressure drop in the moving blades is relatively small. Therefore, the correct answer is option 'A' - Only in the nozzles.
Introduction:
An impulse turbine is a type of steam turbine used in power plants and other industries to convert the kinetic energy of a high-pressure steam into mechanical work. It operates on the principle of the impulse reaction, where a high-velocity jet of steam is directed onto the blades of the turbine rotor, causing it to rotate.
Pressure Drop:
The pressure drop in an impulse turbine occurs primarily in the nozzles. The nozzles are fixed, stationary components that serve the purpose of channeling the high-pressure steam into high-velocity jets. These jets then impinge on the moving blades, causing them to rotate.
Nozzles and Pressure Drop:
The pressure drop in an impulse turbine primarily occurs in the nozzles due to the conversion of pressure energy to kinetic energy. The nozzles are designed to accelerate the steam to a high velocity by increasing its kinetic energy. This acceleration is achieved by creating a convergent-divergent nozzle geometry, where the steam passes through a converging section followed by a diverging section.
Converging Section:
In the converging section of the nozzle, the steam flow area decreases, leading to an increase in velocity and a corresponding decrease in pressure. This decrease in pressure is due to the conversion of pressure energy into kinetic energy.
Diverging Section:
In the diverging section of the nozzle, the steam flow area increases, causing the velocity to decrease and the pressure to increase. However, the pressure in the diverging section does not reach the same level as the inlet pressure. This is because some of the pressure energy has been converted into kinetic energy in the converging section.
Impact on Moving Blades:
Once the high-velocity jets of steam leave the nozzles, they impinge on the moving blades of the turbine rotor. The impact of the steam on the blades causes a change in momentum, resulting in the rotation of the rotor. However, the pressure drop in the moving blades is relatively small compared to that in the nozzles.
Conclusion:
In an impulse turbine, the pressure primarily drops in the nozzles due to the conversion of pressure energy into kinetic energy. The pressure drop in the moving blades is relatively small. Therefore, the correct answer is option 'A' - Only in the nozzles.
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Question Description
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