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In a centrifugal compressor, an increase in speed at a given pressure ratio causes
- a)increase inflow and increase in efficiency
- b)increase in flow and decrease in efficiency
- c)decrease in flow and increase in efficiency
- d)decrease in flow and decrease in efficiency
Correct answer is option 'B'. Can you explain this answer?
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In a centrifugal compressor, an increase in speed at a given pressure...
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In a centrifugal compressor, an increase in speed at a given pressure...
In a centrifugal compressor, an increase in speed at a given pressure ratio causes an increase in flow and a decrease in efficiency.
Explanation:
Centrifugal compressors are widely used in various industries for compressing gases. They consist of a rotating impeller that accelerates the gas and then converts the kinetic energy into pressure energy. The performance of a centrifugal compressor is influenced by several factors, including the speed at a given pressure ratio.
1. Speed and Flow:
When the speed of the centrifugal compressor increases at a given pressure ratio, it causes an increase in the flow rate. This is because the rotational speed of the impeller directly affects the amount of gas that can be handled by the compressor. As the impeller rotates faster, it creates more centrifugal force, which in turn increases the flow rate.
2. Speed and Efficiency:
However, an increase in speed also results in a decrease in efficiency. Efficiency is a measure of how effectively the compressor converts the input energy into pressure energy. When the speed increases, the compressor experiences higher aerodynamic losses and mechanical losses, which reduce its overall efficiency.
3. Aerodynamic Losses:
At higher speeds, the gas flowing through the compressor experiences greater frictional losses and increased turbulence. This leads to additional energy losses in the form of heat and pressure drop, reducing the efficiency of the compressor.
4. Mechanical Losses:
Increased speed puts greater mechanical stress on the impeller and other compressor components. This results in higher friction losses and a decrease in mechanical efficiency. The increased wear and tear may also lead to reduced reliability and increased maintenance requirements.
Therefore, an increase in speed at a given pressure ratio in a centrifugal compressor causes an increase in flow due to higher centrifugal force but decreases the overall efficiency due to increased aerodynamic and mechanical losses. It is important to strike a balance between speed and efficiency to optimize the performance of the centrifugal compressor.
Explanation:
Centrifugal compressors are widely used in various industries for compressing gases. They consist of a rotating impeller that accelerates the gas and then converts the kinetic energy into pressure energy. The performance of a centrifugal compressor is influenced by several factors, including the speed at a given pressure ratio.
1. Speed and Flow:
When the speed of the centrifugal compressor increases at a given pressure ratio, it causes an increase in the flow rate. This is because the rotational speed of the impeller directly affects the amount of gas that can be handled by the compressor. As the impeller rotates faster, it creates more centrifugal force, which in turn increases the flow rate.
2. Speed and Efficiency:
However, an increase in speed also results in a decrease in efficiency. Efficiency is a measure of how effectively the compressor converts the input energy into pressure energy. When the speed increases, the compressor experiences higher aerodynamic losses and mechanical losses, which reduce its overall efficiency.
3. Aerodynamic Losses:
At higher speeds, the gas flowing through the compressor experiences greater frictional losses and increased turbulence. This leads to additional energy losses in the form of heat and pressure drop, reducing the efficiency of the compressor.
4. Mechanical Losses:
Increased speed puts greater mechanical stress on the impeller and other compressor components. This results in higher friction losses and a decrease in mechanical efficiency. The increased wear and tear may also lead to reduced reliability and increased maintenance requirements.
Therefore, an increase in speed at a given pressure ratio in a centrifugal compressor causes an increase in flow due to higher centrifugal force but decreases the overall efficiency due to increased aerodynamic and mechanical losses. It is important to strike a balance between speed and efficiency to optimize the performance of the centrifugal compressor.
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In a centrifugal compressor, an increase in speed at a given pressure ratio causesa)increase inflow and increase in efficiencyb)increase in flow and decrease in efficiencyc)decrease in flow and increase in efficiencyd)decrease in flow and decrease in efficiencyCorrect answer is option 'B'. Can you explain this answer?
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