Langley Research Center Turbulence Modeling Resource

Exp: CFDVAL2004 Case 1: Synthetic Jet into Quiescent Air

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In Case 1, an oscillating jet of air emanates from a slot in the floor. The slot is 0.05 inches wide and 1.4 inches long. The slot is at the bottom of an enclosed box 24 inches by 24 inches by 24 inches, and is in the center of the floor and is parallel with the sides of the outer walls. The flow through the slot alternates between outflow and inflow. It is driven by a side-mounted piezoelectric diaphragm on the side of a narrow cavity under the floor. The diaphragm is approximately 2" in diameter. There is an o-ring seal mounting the diaphragm to the cavity. That o-ring is approximately 1.85" in diameter. The medium is air at sea level. See Chen et al (2000) and Chen (2002) for similar work. Experimental data is centered on the long axis of the slot (spanning the slot in the 0.05-inch-direction), and is synchronized with the drive frequency at 72 phases. References:

• Yao, C.-S., Chen, F. J., and Neuhart, D., "Synthetic Jet Flowfield Database for Computational Fluid Dynamics Validation," AIAA Journal, Vol. 44, No. 12, 2006, pp. 3153-3157, https://doi.org/10.2514/1.13819.
• Chen, F.-J., Yao, C., Beeler, G. B., Bryant, R. G., and Fox, R. L., "Development of Synthetic Jet Actuators for Active Flow Control at NASA Langley," AIAA Paper 2000-2405, June 2000, https://doi.org/10.2514/6.2000-2405.
• Chen, F.-J., "Optimized Synthetic Jet Actuators," LAR 16234, NASA Tech Briefs, July 2002.

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