| Issue |
Volume 2, 2011
Progress in Propulsion Physics
|
|
|---|---|---|
| Page(s) | 655 - 674 | |
| Section | Thrust Nozzles | |
| DOI | https://doi.org/10.1051/eucass/201102655 | |
| Published online | 01 October 2012 | |
Wall pressure and thrust of a dual bell nozzle in a cold gas facility
1
ONERA Meudon 92190, France
2
CNES Evry 91023, France
3
ENSAM Paris 75000, France
A dual-bell nozzle has been tested in the ONERA-R2Ch wind tunnel within the CNES PERSEUS program. The wall pressure distributions and the thrust for the two flow regimes have been characterized in the nozzle pressure ratio (NPR) range from 51 up to 597. A hysteresis on the transition NPR between the two flow regimes has been observed according to the evolution of NPR. The duration for the switch between the two flow regimes is less than 10 ms. The hysteresis of about 20% on the NPR has also a direct effect on the thrust. The total thrust of the dual-bell nozzle becomes higher than the thrust of the isolated base nozzle without extension for NPR > 1500. The hysteresis phenomenon has been modeled with the use of supersonic separation criteria and by making the assumption that incipient separation occurs immediately after the transition for increasing NPRs, while effective separation occurs just before the transition for decreasing NPRs.
© Owned by the authors, published by EDP Sciences, 2011