Sample interview questions: Explain the concept of flow control using active and passive techniques.
Sample answer:
Active Flow Control
Active flow control techniques employ external energy sources to manipulate and improve fluid flow characteristics. These techniques involve adding energy to the system and can be used to achieve various objectives:
- Boundary layer control: Delaying flow separation and improving aerodynamic performance by altering the boundary layer flow.
- Vortex generators: Creating vortices to enhance mixing, dissipate flow energy, or redirect flow.
- Jets: Injecting high-energy jets to modify flow patterns, enhance cooling, or reduce noise.
- Plasma actuators: Using electrical discharges to create localized flow disturbances, enabling fine control over flow parameters.
Passive Flow Control
Passive flow control techniques rely on the fluid’s inherent properties and geometry to influence flow behavior without external energy input. These techniques are typically more cost-effective and less complex than active methods.
- Geometric modifications: Modifying the shape or geometry of the flow boundaries to alter flow patterns, reduce drag, or impr… Read full answer
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