Aeroacoustics of High-Speed Jet Impingement Navy SBIR FY2010.2 Sol No.: Navy SBIR FY2010.2 Topic No.: N102-133 Topic Title: Aeroacoustics of High-Speed Jet Impingement Proposal No.: N102-133-1228 Firm: Cascade Technologies Incorporated 2445 Faber Place #100 Palo Alto, California 94303 Contact: Yaser Khalighi Phone: (650) 521-0243 Web Site: www.turbulentflow.com Abstract: CASCADE Technologies is proposing to use CharLES, its in-house unstructured large eddy simulation technology (LES), to simulate the flow and noise emitted from supersonic impinging jets. This problem is relevant to noise of combat aircrafts designed for Short Takeoff and Vertical landing (STOVL) as well as interaction of propulsive jets with Jet Blast Deflectors (JBD) on an aircraft carrier deck. To demonstrate the prediction capabilities of CharLES, a supersonic jet issuing from nozzle and impinging on a ground plane will be considered in Phase I; LES results will be validated against the experimental measurements of the STOVL supersonic facility at the Florida State University. In addition, a proof of concept LES of JBD interacting with a propulsive high-speed jet will be carried out in Phase I. In the option phase, we will study a heated jet as well as the effect of nozzle distance from the ground. Phase II will focus on further development and demonstration of LES and acoustic prediction tools for impinging jet aeroacoustics with realistic geometry such as twin nozzles, part of airframe, ground plane and jet blast deflector. During this Phase, CASCADE will collaborate with GE on modeling propulsive jet-JBD interaction flow and aeroacoustics. Benefits: The successful completion of the overall project (Phase I and II) should lead to a physics-based computational prediction capability for supersonic jet impingement. This prediction tool relies on capturing the unsteady dynamics of turbulent motions responsible for the noise generation and realistically captures the effects of propulsion nozzle system geometric details. This computational tool is well suited for future design analyses to support the development of new concepts for substantially mitigating the noise at its source. Return