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Jet-surface interaction: high aspect ratio nozzle test, nozzle design and preliminary data
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Brown, Clifford Dippold, Vance |
| Copyright Year | 2015 |
| Description | The Jet-Surface Interaction High Aspect Ratio (JSI-HAR) nozzle test is part of an ongoing effort to measure and predict the noise created when an aircraft engine exhausts close to an airframe surface. The JSI-HAR test is focused on parameters derived from the Turbo-electric Distributed Propulsion (TeDP) concept aircraft which include a high-aspect ratio mailslot exhaust nozzle, internal septa, and an aft deck. The size and mass flow rate limits of the test rig also limited the test nozzle to a 16:1 aspect ratio, half the approximately 32:1 on the TeDP concept. Also, unlike the aircraft, the test nozzle must transition from a single round duct on the High Flow Jet Exit Rig, located in the AeroAcoustic Propulsion Laboratory at the NASA Glenn Research Center, to the rectangular shape at the nozzle exit. A parametric nozzle design method was developed to design three low noise round-to-rectangular transitions, with 8:1, 12:1, and 16: aspect ratios, that minimizes flow separations and shocks while providing a flat flow profile at the nozzle exit. These designs validated using the WIND-US CFD code. A preliminary analysis of the test data shows that the actual flow profile is close to that predicted and that the noise results appear consistent with data from previous, smaller scale, tests. The JSI-HAR test is ongoing through October 2015. The results shown in the presentation are intended to provide an overview of the test and a first look at the preliminary results. |
| File Size | 1665580 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150023470 |
| Archival Resource Key | ark:/13960/t45q9xp83 |
| Language | English |
| Publisher Date | 2015-10-20 |
| Access Restriction | Open |
| Subject Keyword | Aeroacoustics Computational Aeroacoustics Code Validation Boundary Layer Separation Nozzle Design Exhaust Nozzles Mass Flow Rate Computational Fluid Dynamics Ducts Surface Reactions Low Noise Aspect Ratio Separated Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Presentation |
