Prospects for Nonlinear Laser Diagnostics in the Jet Noise Laboratory
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Two experiments were conducted to test whether optical methods, which rely on laser beam coherence, would be viable for off-body flow measurement in high-density, compressible-flow wind tunnels. These tests measured the effects of large, unsteady density gradients on laser diagnostics like laser-induced thermal acoustics (LITA). The first test was performed in the Low Speed Aeroacoustics Wind Tunnel (LSAWT) of NASA Langley Research Center's Jet Noise Laboratory (JNL). This flow facility consists of a dual-stream jet engine simulator (with electric heat and propane burners) exhausting into a simulated flight stream, reaching Mach numbers up to 0.32. A laser beam transited the LSAWT flow field and was imaged with a high-speed gated camera to measure beam steering and transverse mode distortion. A second, independent test was performed on a smaller laboratory jet (Mach number
| Publisher Name | Independently Published |
|---|---|
| Author Name | Hagendorf, Col |
| Format | Audio |
| Bisac Subject Major | SCI |
| Language | NG |
| Isbn 10 | 1794387307 |
| Isbn 13 | 9781794387300 |
| Target Age Group | min:NA, max:NA |
| Dimensions | 01.10" H x 00.08" L x 50.00" W |
| Page Count | 36 |
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