Two-point radiation statistics from large-scale turbulent structures within supersonic jets
Abstract
The noise from large-scale coherent turbulent structures within jets remains the dominant source. For the purpose of developing future control systems for the large-scale noise source, we investigate the statistics between upstream and downstream radiating waves. We investigate two off-design supersonic jet flows with instability theory and associated noise radiation, large-eddy simulation (LES), and experiments. We compare the auto-correlation, cross-correlation, coherence, and other statistics predicted by aeroacoustic instability theory. As instability waves are closely connected with the formation of large-scale turbulent structures, they yield insight into large-scale noise statistics. We investigate two nozzles at two supersonic off-design conditions. The first is a biconic nozzle operating at an unheated condition, and the second is a NASA nozzle operating at a heated condition. We find that for these jets, the noise from instability waves is coherent between 0.40 to 0.70 at large-scale radiation frequencies between the downstream and upstream radiation directions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 13, 2021
- Source ID
- 10.1177/1475472x211005413
Entities
People
- James D Goldschmidt
- Jianhui Cheng
- Lawrence S Ukeiley
- Steven Miller
- Weiqi Shen
Organizations
- Strategic Environmental Research and Development Program
- University of Florida