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The flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed as
- a)free vortex
- b)forced vortex
- c)solid body rotation
- d)logarithmic spiral
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
The flow in the vaneless space between the impeller exit and diffuser ...
There is clearance between the impeller and vane leading edge, called vaneless space. In the vaneless space, the flow follow an approximately logarithmic spiral path to leading edge of the vanes after which it is constrained by the diffuser channel to follow the blade shape curvature.
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The flow in the vaneless space between the impeller exit and diffuser ...
Explanation:
The flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed as a logarithmic spiral.
Logarithmic Spiral:
A logarithmic spiral is a type of spiral that has a special relationship between the angle and the distance from the center. In a logarithmic spiral, the distance between successive turns of the spiral increases exponentially. It is a self-similar spiral, which means that the spiral is made up of smaller versions of itself.
Flow in the Vaneless Space:
The vaneless space is the space between the impeller exit and the diffuser inlet in a centrifugal compressor. The flow in the vaneless space is important because it affects the performance of the compressor.
Assumption:
The assumption that the flow in the vaneless space is a logarithmic spiral is based on the fact that the flow is not subject to any external forces or influences. In other words, the flow is free from any external disturbances and is not affected by the presence of any blades or vanes.
Advantages:
There are several advantages to assuming that the flow in the vaneless space is a logarithmic spiral:
1. It simplifies the analysis of the flow.
2. It provides a good approximation of the actual flow.
3. It allows for a more accurate prediction of the performance of the compressor.
Conclusion:
In conclusion, the flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed as a logarithmic spiral. This assumption simplifies the analysis of the flow and allows for a more accurate prediction of the performance of the compressor.
The flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed as a logarithmic spiral.
Logarithmic Spiral:
A logarithmic spiral is a type of spiral that has a special relationship between the angle and the distance from the center. In a logarithmic spiral, the distance between successive turns of the spiral increases exponentially. It is a self-similar spiral, which means that the spiral is made up of smaller versions of itself.
Flow in the Vaneless Space:
The vaneless space is the space between the impeller exit and the diffuser inlet in a centrifugal compressor. The flow in the vaneless space is important because it affects the performance of the compressor.
Assumption:
The assumption that the flow in the vaneless space is a logarithmic spiral is based on the fact that the flow is not subject to any external forces or influences. In other words, the flow is free from any external disturbances and is not affected by the presence of any blades or vanes.
Advantages:
There are several advantages to assuming that the flow in the vaneless space is a logarithmic spiral:
1. It simplifies the analysis of the flow.
2. It provides a good approximation of the actual flow.
3. It allows for a more accurate prediction of the performance of the compressor.
Conclusion:
In conclusion, the flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed as a logarithmic spiral. This assumption simplifies the analysis of the flow and allows for a more accurate prediction of the performance of the compressor.
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The flow in the vaneless space between the impeller exit and diffuser inlet of a centrifugal compressor can be assumed asa)free vortexb)forced vortexc)solid body rotationd)logarithmic spiralCorrect answer is option 'D'. Can you explain this answer?
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