Acoustic and flow characteristics of cold high-speed coaxial jets
Abstract
Far-field noise of model coaxial supersonic cold jets exhausting from a coplanar convergent two-nozzle coaxial configuration was investigated. The pressure ratio (velocity) of the outer annular jet was maintained higher than the inner round jet. For each outer jet pressure ratio, the inner jet operating pressure ratio for the 'minimum' radiated noise was established. Experimental results on the noise reductions and the modifications of the shock structure and velocity distribution of coaxial flows at the 'minimum' noise conditions are presented and are compared with those of a single convergent underexpanded round as well as an annular jet at a wide range of operating pressure ratios.
- Publication:
-
AIAA, Aerospace Sciences Meeting
- Pub Date:
- January 1978
- Bibcode:
- 1978aiaa.meetR....B
- Keywords:
-
- Acoustic Properties;
- Annular Flow;
- Coaxial Flow;
- Engine Noise;
- Flow Characteristics;
- Jet Flow;
- Nozzle Flow;
- Acoustic Measurement;
- Annular Nozzles;
- Far Fields;
- Jet Engines;
- Mach Number;
- Noise Reduction;
- Nozzle Geometry;
- Acoustics