Application Cases

Experiment Name: Application of ATA-2082 Power Amplifier in Synthetic Jet Actuators

Experimental Content:
The synthetic jet actuator utilizes the vibrational deformation of a piezoelectric ceramic diaphragm to alternately compress and expand the fluid within a cylindrical cavity, generating a synthetic jet at the outlet. A sinusoidal wave generated by a signal generator serves as the excitation signal. The signal is amplified by a power amplifier and subsequently applied to the piezoelectric ceramic, causing it to deform and driving the entire diaphragm into vibrational motion. By varying the amplification factor of the power amplifier, the trend in the outlet velocity of the synthetic jet actuator is observed.

Research Direction: Flow Control

Testing Equipment: ATA-2082 high-voltage amplifier, signal generator, piezoelectric ceramic diaphragm, oscilloscope, hot-wire anemometer, displacement sensor

Experimental Procedure:
The left figure shows a schematic diagram and a physical photograph of the synthetic jet actuator. The housing is fabricated using 3D printing and includes components such as the piezoelectric ceramic diaphragm, cavity, and sealing rings. During operation, the two halves of the housing are fastened together with screws. Its working principle is based on the deformation of the piezoelectric ceramic, which alternately compresses and expands the air within the cavity, causing air to be expelled and drawn in at the outlet, thereby forming a synthetic jet.

The right figure depicts the experimental setup. During the experiment, the excitation signal is generated by a signal generator, amplified by the power amplifier, and then applied to drive the piezoelectric ceramic diaphragm into vibrational deformation. The vibration information is detected by a displacement sensor. A synthetic jet is formed at the rectangular outlet, and the outlet velocity is measured using a hot-wire anemometer.

Experimental Results:
The left figure presents the instantaneous velocity of the synthetic jet measured by the hot-wire anemometer. Positive and negative velocities are observed at the outlet, corresponding to the blowing and suction phases, respectively, which are characteristic features of a synthetic jet.

The right figure illustrates the variation in synthetic jet velocity with the amplification factor of the power amplifier. The results indicate that the average velocity of the synthetic jet increases as the voltage amplification factor increases.

Further findings reveal that when both channels of the power amplifier are simultaneously connected to synthetic jet actuators, waveform distortion occurs at lower voltages, and the outlet velocity of the synthetic jet decreases. This may be attributed to insufficient power output from the amplifier. Based on previous research, higher velocities lead to more pronounced flow control effects, necessitating power amplifiers with greater output capacity.

Figure: ATA-2082 High-Voltage Amplifier Specifications and Parameters