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In axial flow pumps and compressors the combined velocity diagram with common base is used to determine change in
- a)absolute velocity (V2 − V1 )
- b)relative velocity (Vr2 − Vr1 )
- c)tangential velocity (U2 − U1 )
- d)whirl velocity (Vw2 − Vw1 )
Correct answer is option 'D'. Can you explain this answer?
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In axial flow pumps and compressors the combined velocity diagram wit...
For axial flow compressors/pumps, U1 = U2 , which is represented as the common base for the combined velocity triangles. Now although V2 − V1 and Vr2 − Vr1 can be calculated from the velocity triangles, but the most important parameter that the velocity triangles are used for is Vw2 − Vw1 (difference of whirl velocities at outlet and inlet) which helps to calculate the head given to the fluid by the pump/compressor.
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In axial flow pumps and compressors the combined velocity diagram wit...
Understanding Axial Flow Pumps and Compressors
In axial flow pumps and compressors, the velocity diagram is crucial for analyzing the fluid dynamics involved. The combined velocity diagram with a common base helps in understanding the relationships between different velocities.
Key Velocity Components
- Absolute Velocity (V): This refers to the velocity of the fluid as it moves through the pump or compressor.
- Relative Velocity (Vr): This is the velocity of the fluid relative to the rotor or blade.
- Tangential Velocity (U): This is the velocity component tangential to the circle described by the rotating blades.
- Whirl Velocity (Vw): This is the component of velocity that contributes to the circular motion of the fluid around the rotor.
Focus on Whirl Velocity
The correct answer is option 'D', indicating that the combined velocity diagram is primarily used to determine the change in whirl velocity (Vw2 - Vw1). Here’s why:
- Impact of Whirl Velocity: The whirl velocity is critical in understanding how the fluid behaves as it enters and exits the impeller.
- Energy Transfer: The change in whirl velocity directly correlates with energy transfer to the fluid. It indicates how much energy is added or extracted by the rotor.
- Flow Direction: This velocity component helps in assessing the flow direction and stability, ensuring the pump or compressor operates efficiently.
Conclusion
In summary, while all velocity components are essential, the combined velocity diagram's primary role in axial flow pumps and compressors is to analyze the changes in whirl velocity. This understanding aids in optimizing performance and efficiency in fluid machinery.
In axial flow pumps and compressors, the velocity diagram is crucial for analyzing the fluid dynamics involved. The combined velocity diagram with a common base helps in understanding the relationships between different velocities.
Key Velocity Components
- Absolute Velocity (V): This refers to the velocity of the fluid as it moves through the pump or compressor.
- Relative Velocity (Vr): This is the velocity of the fluid relative to the rotor or blade.
- Tangential Velocity (U): This is the velocity component tangential to the circle described by the rotating blades.
- Whirl Velocity (Vw): This is the component of velocity that contributes to the circular motion of the fluid around the rotor.
Focus on Whirl Velocity
The correct answer is option 'D', indicating that the combined velocity diagram is primarily used to determine the change in whirl velocity (Vw2 - Vw1). Here’s why:
- Impact of Whirl Velocity: The whirl velocity is critical in understanding how the fluid behaves as it enters and exits the impeller.
- Energy Transfer: The change in whirl velocity directly correlates with energy transfer to the fluid. It indicates how much energy is added or extracted by the rotor.
- Flow Direction: This velocity component helps in assessing the flow direction and stability, ensuring the pump or compressor operates efficiently.
Conclusion
In summary, while all velocity components are essential, the combined velocity diagram's primary role in axial flow pumps and compressors is to analyze the changes in whirl velocity. This understanding aids in optimizing performance and efficiency in fluid machinery.
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In axial flow pumps and compressors the combined velocity diagram with common base is used to determine change ina) absolute velocity (V2 − V1 )b) relative velocity (Vr2 − Vr1 )c) tangential velocity (U2 − U1 )d) whirl velocity (Vw2 − Vw1 )Correct answer is option 'D'. Can you explain this answer?
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In axial flow pumps and compressors the combined velocity diagram with common base is used to determine change ina) absolute velocity (V2 − V1 )b) relative velocity (Vr2 − Vr1 )c) tangential velocity (U2 − U1 )d) whirl velocity (Vw2 − Vw1 )Correct answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about In axial flow pumps and compressors the combined velocity diagram with common base is used to determine change ina) absolute velocity (V2 − V1 )b) relative velocity (Vr2 − Vr1 )c) tangential velocity (U2 − U1 )d) whirl velocity (Vw2 − Vw1 )Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In axial flow pumps and compressors the combined velocity diagram with common base is used to determine change ina) absolute velocity (V2 − V1 )b) relative velocity (Vr2 − Vr1 )c) tangential velocity (U2 − U1 )d) whirl velocity (Vw2 − Vw1 )Correct answer is option 'D'. Can you explain this answer?.
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