Optimization Of Synthetic Jet Actuator Location For Aerodynamic Drag Reduction Of Backward-Facing Step

Teo, Yong Soon (2018) Optimization Of Synthetic Jet Actuator Location For Aerodynamic Drag Reduction Of Backward-Facing Step. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Active flow control is one of the aerodynamics flow control techniques that used to improve aerodynamics properties such as drag reduction, lift augmentation, noise mitigation and mixing enhancement by manipulating the boundary layer of the fluid flow. Synthetic jet actuator (SJA) is an active flow control device that used to manipulate the boundary layer by synthetic jet pulse producing by a vibrating membrane through a small orifice in order to improve the aerodynamics properties. The purpose of this study was to find an ideal location to locate the SJA in the backward-facing step and study the effect on the aerodynamic drag of the bluff body at different jet locations. The first simulation was performed on the SJA model in order to adopt an appropriate method to locate it in the backward-facing step. After that, a simulation was done on the backward-facing step without SJA (uncontrolled flow) in order to get the separation point for the simulation on the backward-facing step with SJA (controlled flow). A series of simulation was done on the controlled flow case in which the SJA located at separation point (0.75h), before separation point (0.25h), after separation point (1.25h) and SJA arrays at both separation and reattachment point (0.75h and 2.0825h). The study found out that the SJA arrays located at both separation point and reattachment point had the highest drag reduction of 26.05% while the single SJA located before separation point had the lowest drag reduction of only 0.84%. It was concluded that the best location to locate the SJA was at both separation and reattachment point.

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