Impinging jet as a method for enhancement of rectification effects in hybrid synthetic jet actuator

0429669 - ÚT 2015 JP eng C - Conference Paper (international conference)
Kordík, Jozef - Broučková, Zuzana - Trávníček, Zdeněk
Impinging jet as a method for enhancement of rectification effects in hybrid synthetic jet actuator.
16th International Symposium on Flow Visualization, ISFV16. Okinawa: Visualization Society of Japan, 2014, s. 1-13.
[International Symposium on Flow Visualization /16./, ISFV16. Okinawa (JP), 24.06.2014-28.06.2014]
R&D Projects: GA ČR GPP101/12/P579
Institutional support: RVO:61388998
Keywords : synthetic jet * hybrid synthetic jet * volumetric efficiency
Subject RIV: JU - Aeronautics, Aerodynamics, Aircrafts

A new principle of flow rectification for hybrid synthetic jet actuators (HSJAs) is introduced in this paper. The flow rectification can be accomplished by means of fluidic diodes, which are embedded in HSJAs. The novelty of the present study consists in proposal of the fluidic diode in form of conical nozzle placed against a wall. The periodic jet flow issuing from the nozzle impinges on the wall and thus the flow differences during blowing and suction strokes result in enhanced rectification effect. The effect is quantified using so called volumetric efficiency. The volumetric efficiency was evaluated experimentally in this study. The experiments were performed using constant temperature anemometry and smoke visualization technique in phase-locked arrangement with air as working fluid. The nozzle-to-wall distance and driving frequency of present HSJA were varied and the combination of the parameters achieving the highest volumetric efficiency was found.
Permanent Link: http://hdl.handle.net/11104/0235411