The three-dimensional interactions of the near-field structures in a developing two-stream exhaust by a three-stream engine are documented. This paper analyzes six planes of near-field pressure generated by large-eddy simulation. After a basic documentation of the spectral analysis, several hot-spots that participate in the dynamics of the complex flow are identified. Cross-correlations between the hot-spots and the entire pressure fields reveal the interactions and propagations of near-field structures, which include shocks, vortex structures, and acoustic radiation. The near-field interactions are also studied in specific frequency bands, which enable us to map out their communication pathways. By applying phase-averaging to the pressure fluctuations, strong phase relationships in the developing jet are identified and the information propagation is confirmed by proper orthogonal decomposition. Some pressure signals outside the jet core are found as good reference for the phase of pressure fields and they are experimentally accessible as possible Kulite sensors. The different techniques applied show consistent results and confirm the identified regions and frequencies that play a key role in the near-field dynamics.
Near-Field Shock/Shear-Layer Interactions in a Two-Stream Supersonic Rectangular Jet from Three-Stream Engine
AIAA Journal ; 56 , 3 ; 1031-1046
2017-11-09
16 pages
Article (Journal)
Electronic Resource
English