Thermal Synthetic Jet Actuator Investigation by Experimental Approach

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Thermal Synthetic Jet Actuator Investigation by Experimental Approach

Rimašauskienė, Rūta

Abstract An experimental analysis of the thermal characteristics of piezoelectric actuator Sonox P502 and two different diaphragms of the synthetic jet generator were presented in this chapter. It is extremely important to study temperature characteristics of the components with piezoelectric actuators working in various modes. Often piezoelectric actuators are used aiming to obtain maximum displacements that are possible when a piezoelectric actuator operates under maximum excitation voltage and often at the first resonance frequency. The theory suggests that working in such modes extremely increases temperature of the piezoelectric elements, and it can reach maximum point. High temperatures might cause deformation or other changes of mechanical properties of the other components. This might influence the life time and operational characteristics of the synthetic jet generator. The main task of this work was to find the best working conditions for the synthetic jet generator. Dynamic characteristics of the diaphragm with piezoelectric material were measured using non-contact measuring equipment laser vibrometer Polytec ® PSV 400. Temperatures of the piezoelectric diaphragms working at different resonance frequencies were measured with fibre Bragg grating (FBG) sensor. The best working conditions for synthetic jet generator were chosen.