Skip to main content Accessibility help

Pressure Loading of Piezo Composite Unimorphs

  • Poorna Mane (a1), Karla Mossi (a2) and Robert Bryant (a3)


Over the past decade synthetic jets have emerged as a promising means of active flow control. They have the ability to introduce small amounts of energy locally to achieve non-local changes in the flow field. These devices have the potential of saving millions of dollars by increasing the efficiency and simplifying fluid related systems. A synthetic jet actuator consists of a cavity with an oscillating diaphragm. As the diaphragm oscillates, jets are formed through an orifice in the cavity. This paper focuses on piezoelectric synthetic jets formed using two types of active diaphragms, Thunder® and Lipca. Thunder® is composed of three layers; two metal layers, with a PZT-5A layer in between, bonded with a polyimide adhesive. Lipca is a Light WeIght Piezo Composite Actuator, formed of a number of carbon fiber prepreg layers and an active PZT-5A layer. As these diaphragms oscillate, pressure differences within the cavity as well as average maximum jet velocities are measured. These parameters are measured under load and no-load conditions by controlling pressure at the back of the actuator or the passive cavity. Results show that the average maximum jet velocities measured at the exit of the active cavity, follow a similar trend to the active pressures for both devices. Active pressure and jet velocity increase with passive pressure to a maximum, and then decrease. Active pressure and the jet velocity peaked at the same passive cavity pressure of 18kPa for both diaphragms indicating that the same level of pre-stresses is present in both actuators even though Lipca produces approximately 10% higher velocities than Thunder®.



Hide All
1. Gad-el-Hak, M., Flow Control: Passive, Active, and Reactive Flow Management, 1st ed. (Cambridge University Press, United Kingdom, 2000), pp. 19.
2. Kral, L.D., Donovan, J.F., Cain, A.B., Cary, A.W., Numerical Simulation of Synthetic Jet Actuators, AIAA Conference, 971824 (1997).
3. Smith, B.L., Glezer, A., Vectoring and Small Scale Motions Effected in Free Shear Flows Using Synthetic Jet Actuators, AIAA, 970213 (1997).
4. Amitay, M., Honohan, A., Trautman, M., Glezer, A., Modification of the aerodynamic characteristics of bluff bodies using fluidic actuators, AIAA, 972004 (1997).
5. McLean, J.D., Crouch, J.D., Stoner, R.C., Sakurai, S., Seidel, G.E., Feifel, W.M., Rush, H.M., Study of the Application of Separation Control by Unsteady Excitation to Civil Transport Aircraft, NASA, Tech. Rep. CR1999 (1999).
6. Smith, B.L., Synthetic Jets and their Interaction with Adjacent Jets, Georgia Institute of Engineering, Ph.D. Thesis (1999).
7. Seifert, A., Bachar, T., Koss, D., Shepshelovich, M., Wygnanski, I., Oscillatory Blowing: A Tool to Delay Boundary-Layer Separation, AIAA J., 31(11), 2052 (1993).
8. Seifert, A., Darabi, A., Wygnanski, I., Delay of Airfoil Stall by Periodic Excitation, J. Air., 33(4), 691 (1996).
9. Crook, A., Sadri, A.M., Wood, N.J., The Development and Implementation of Synthetic Jets for the Control of Separated Flow, AIAA, 993176 (1999).
10. Mossi, K., Bryant, R., Pre-stressed Circular Actuators, Amer. Cer. Soc., pp. 445454 (2004).
11. Mossi, K., Bryant, R., R., , Piezoelectric Actuators for Synthetic Jet Applications, MRS Proceedings, 785, 407 (2004).
12. Mossi, K., Selby, G., Bryant, R., Thin-Layer Composite Unimorph Ferroelectric Driver and Sensor Properties, Mats Letters, 35, 39 (1998).
13. Yoon, K.J., Shin, S., Park, H.C., Goo, N.S., Design and Manufacture of Lightweight Piezoceramic Curved Actuator, Smart Mats. and Struct., 11, 163 (2002).
14. John, J. E.A., Gas Dynamics, 2nd edition (Allyn and Bacon, 1984), pp 180.


Pressure Loading of Piezo Composite Unimorphs

  • Poorna Mane (a1), Karla Mossi (a2) and Robert Bryant (a3)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed