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• W4379877621 abstract "A Computational and Experimental Investigation into Jet Aeroacoustics for Improved Ground Test Facility Design Chris Romanoski1, Captain Brian M. Gatzke2, Stephen Guimond3, Steve Arnold4 U.S. Air Force, Arnold AFB, TN 37389 Dr. Phil Kreth5 University of Tennessee Space Institute, Tullahoma, TN 37388 Lieutenant Colonel Mike Knauf6 United States Air Force Academy, Colorado Springs, CO 80841 At Arnold Engineering Development Complex (AEDC), some developmental turbine engine tests are limited due to elevated noise levels generated from jet aeroacoustics. Mitigation methods to reduce the noise are often implemented in a trial-and-error fashion that extend the test program time and cost. A computational and experimental initiative was recently started at AEDC to improve the in-house capability to design jet aeroacoustic sound reduction features into the test installation. This paper presents early results comparing the CFD predictions with experimental measurements. Nomenclature ATF = Altitude Simulation Test Facility AEDC = Arnold Engineering Development Complex CFD = Computational Fluid Dynamics CREATE = Computational Research and Engineering Acquisition Tools Environment DDES = Delayed Detached-Eddy Simulation ETF = Engine Test Facility FLDI = Focused Laser Differential Interferometry GTF = Ground Test Facility HPCMP = High Performance Computing Modernization Program NPR = Nozzle Pressure Ratio SPL = Sound Pressure Level USAFA = United States Air Force Academy UTSI = University of Tennessee Space Institute I. Introduction Since the original construction of the Arnold Engineering Development Complex (AEDC) in the 1950s, the U.S. Department of Defense has utilized advanced Altitude Simulation Test Facilities (ATF) to develop and demonstrate advanced turbine engine designs. AEDC has 6 active propulsion development 1 Test Analyst, Hypersonic Combined Test Force, Arnold AFB, TN 2 Test Engineer, 717th Test Squadron, Arnold AFB, TN 3 CFD Analyst, Technology Section, 804th Test Group, Arnold AFB, TN 4 Technical Advisor, 717th Test Squadron, Arnold AFB, TN 5 Assistant Professor of Mechanical and Aerospace Engineering, UTSI, Tullahoma, TN 6 Assistant Professor of Mathematics, USAFA, Colorado Springs, CO 2 American Institute of Aeronautics and Astronautics Approved for public release; distribution is unlimited. ATFs and three atmospheric intake Ground Test Facilities (GTF). Aeroacoustic phenomena generated by the high energy jet of the turbine engines has sometimes limited the ability to test in the ground facilities. Transonic resonance1 and supersonic screech2 are examples of jet plume acoustics that have been explored for jet engine development since the 1950s. When the jet engine is installed in an ATF or GTF, additional reflective surfaces and ducting result in other acoustic interaction. One of the more extreme examples was the occurrence of Super Resonance in the C-2 ATF in the early 1990s that resulted in resonant acoustic responses over 160 dB3. Design tools are limited to predict and avoid the probability of the engine and test cell acoustic interactions, resulting in test inefficiencies to mitigate potentially damaging responses. To improve the design process, an initiative was undertaken at AEDC to create subscale representations of some of the nozzle and test cell geometries to create aeroacoustic resonance similar to what has been experienced during full scale test. These subscale experiments provided data to validate enhanced Computational Fluid Dynamic (CFD) predictions of the test cell acoustic phenomena. The subscale experiments included different nozzle configurations without a representative test cell and combined nozzle and test cell geometries to predict and attenuate interaction effects. II. Example Engine Installations for Modeling Two representative engine installations for the test facilities were defined for the computational and experimental effort. These two configurations were selected because of occurrences of" @default.
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• W4379877621 date "2023-06-08" @default.
• W4379877621 modified "2023-10-02" @default.
• W4379877621 title "A Computational and Experimental Investigation into Jet Aeroacoustics for Improved Ground Test Design" @default.
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• W4379877621 doi "https://doi.org/10.2514/6.2023-3498" @default.
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