Abstract
Axisymmetric synthetic jet actuators making use of loudspeakers and four lengths of the orifice with and without a confinement plate were experimentally tested and compared. The first (reference) orifice was the shortest one and was confined by the actuator wall. The next length of orifices was obtained with the use of one of three orifices’ extension, with or without a confinement plate. The possibility of the use of the power factor to find the first characteristic frequency is presented. The dependence of the reaction force from the orifice length and the power is described. The time-reaction force of the actuator was measured. The actuators with a confinement plate at the time of measurements of frequency function and at the constant power generate less reaction force, as well as less velocity and efficiency, than the ones without it (even 1.8% at the characteristic frequency).
Highlights
The synthetic jet (SJ) is one of the most thoroughly investigated techniques of flow generation
A SJ is generated by periodic ingestion and expulsion of fluid to the closed cavity
Such a wide range of applications result in the fact that the impact of the shape and dimensions of an actuator on the SJ parameters is being tested—especially of the orifices
Summary
The synthetic jet (SJ) is one of the most thoroughly investigated techniques of flow generation. Depending on the elements used to generate SJs, we may figure out: a piston, a piezoelectric, a loudspeaker, or a plasma synthetic jet actuator (SJA). The time-mean flow through a nozzle is equal to zero, and because of that, a SJ is called a zero-net-mass-flux (ZNMF). A SJ can be used in many other ways, for example, for flow control, for transfer of heat, or for mixing.. A SJ can be used in many other ways, for example, for flow control, for transfer of heat, or for mixing.5,6 Such a wide range of applications result in the fact that the impact of the shape and dimensions of an actuator on the SJ parameters is being tested—especially of the orifices A SJ can be used in many other ways, for example, for flow control, for transfer of heat, or for mixing. Such a wide range of applications result in the fact that the impact of the shape and dimensions of an actuator on the SJ parameters is being tested—especially of the orifices
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