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What is the commonly used boundary layer control method to prevent separation?
- a)Use of smooth boundaries
- b)Using large divergence angle in the boundary
- c)Suction of accelerating fluid within the boundary layer
- d)Suction of retarded fluid within the boundary layer
Correct answer is option 'D'. Can you explain this answer?
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What is the commonly used boundary layer control method to prevent se...
A common method to reduce flow separation is to suck away the fluid which has lost its momentum or blowing in high speed fluid into the boundary layer. Remember, slow fluid is sucked away while high speed fluid is blown in. Flow separation is dependent on the shape of the surface and not on the surface finish whereas a large divergence angle actually encourages separation and hence is avoided.
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What is the commonly used boundary layer control method to prevent se...
The commonly used boundary layer control method to prevent separation is the suction of retarded fluid within the boundary layer. This method involves removing the slow-moving or retarded fluid from the boundary layer, which helps to maintain the flow attachment to the surface and prevent separation.
Explanation:
Suction of Retarded Fluid:
- By using suction devices such as slots or porous materials, the slow-moving fluid within the boundary layer is removed.
- This helps to reduce the boundary layer thickness and prevent separation by maintaining the flow attachment to the surface.
- The removal of the retarded fluid allows for the faster-moving fluid to remain closer to the surface, reducing the likelihood of separation.
Benefits of Suction:
- Suction of the retarded fluid within the boundary layer helps to improve the aerodynamic performance of the surface.
- It can increase the lift and reduce drag, leading to better overall efficiency of the system.
- This method is commonly used in aeronautical applications, such as aircraft wings, to enhance performance and stability.
By employing the suction of retarded fluid within the boundary layer, engineers can effectively control the flow separation and improve the aerodynamic characteristics of the surface. This method is a key technique in boundary layer control to optimize the performance of various engineering systems.
Explanation:
Suction of Retarded Fluid:
- By using suction devices such as slots or porous materials, the slow-moving fluid within the boundary layer is removed.
- This helps to reduce the boundary layer thickness and prevent separation by maintaining the flow attachment to the surface.
- The removal of the retarded fluid allows for the faster-moving fluid to remain closer to the surface, reducing the likelihood of separation.
Benefits of Suction:
- Suction of the retarded fluid within the boundary layer helps to improve the aerodynamic performance of the surface.
- It can increase the lift and reduce drag, leading to better overall efficiency of the system.
- This method is commonly used in aeronautical applications, such as aircraft wings, to enhance performance and stability.
By employing the suction of retarded fluid within the boundary layer, engineers can effectively control the flow separation and improve the aerodynamic characteristics of the surface. This method is a key technique in boundary layer control to optimize the performance of various engineering systems.
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What is the commonly used boundary layer control method to prevent separation?a) Use of smooth boundariesb) Using large divergence angle in the boundaryc) Suction of accelerating fluid within the boundary layerd) Suction of retarded fluid within the boundary layerCorrect answer is option 'D'. Can you explain this answer?
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