Gas Turbine Engine Noise Modeling Navy SBIR FY2005.2 Sol No.: Navy SBIR FY2005.2 Topic No.: N05-088 Topic Title: Gas Turbine Engine Noise Modeling Proposal No.: N052-088-0183 Firm: Combustion Research and Flow Technology, Inc. 6210 Keller's Church Road Pipersville, Pennsylvania 18947-2010 Contact: Neeraj Sinha Phone: (215) 766-1250 Web Site: www.craft-tech.com Abstract: Jet noise mitigation techniques are currently under evaluation by CRAFT Tech and NCPA for application to the F/A-18 E/F aircraft. Varied passive technologies, e.g. microjet blowing, corrugations, etc. analyzed at 1/10th scale culminated in full-scale propulsion stand tests of a F404-400 engine during Summer 2004. Under this proposed SBIR, an "End-to-End" Aircraft Noise Footprint Model will be developed for application to military gas turbine engines. The model interfaces CRAFT Tech' state-of-the-art aircraft plume CFD modeling with well-validated, systems level farfield noise propagation modeling to create a high-fidelity capability for evaluating environmental impact of noise emissions from military gas turbine engines and to enable analysis of potential noise reduction technologies, as well as operational changes. The proposed modeling will integrate noise propagation with topographical data to enable the Navy to generate noise contour maps around naval facilities that are intended to receive the Joint Strike Fighter (JSF). The Phase I effort will provide a demonstration of the model for JSF, as well as its demonstration for evaluating design/operational changes consistent with the requirements of military gas turbine engines. A detailed sub-scale test plan will also be developed for obtaining relevant noise data during Phase II to support model validation and refinement. Benefits: The jet noise modeling/attenuation technology is of direct relevance to the ongoing JSF acquisition. The technology developments proposed are also of extreme relevance to commercial aviation with regards to community noise concerns. The Federal Aviation Administration (FAA) and NASA represent additional avenues for commercialization of noise footprint model and mitigation concepts that will emerge from the proposed program. Noise mitigation techniques have generally proven effective in IR suppression. This provides additional commercialization opportunities since future combat air vehicles have placed a premium on stealth and low-observables (LO). Return