TY - JOUR
T1 - Flow and thrust characteristics of an expansion–deflection dual-bell nozzle
AU - Wang, Yong
AU - Lin, Yuzhen
AU - Eri, Qitai
AU - Kong, Bo
N1 - Publisher Copyright:
© 2022 Elsevier Masson SAS
PY - 2022/4
Y1 - 2022/4
N2 - Expansion–deflection nozzle (EDN) and dual-bell nozzle (DBN) are the designs of altitude compensation nozzles that are currently widely studied. The cold flow subscale experiments and two-dimensional axisymmetric Reynolds-averaged numerical simulations were performed to explore the flow characteristics and the altitude compensation performance of an expansion–deflection dual-bell nozzle (EDDBN), which combines an EDN and DBN. The experimental results, supported by numerical simulation results, showed that the EDDBN is in the sea level closed mode under the experimental nozzle pressure ratios. The transition characteristics of the EDDBN and the DBN were simulated by continuously changing the nozzle inlet total pressure. In wider ranges of nozzle pressure ratios, owing to the lower wall pressure of the extension nozzle, the EDDBN has a higher mode transition pressure ratio than the DBN. Compared with the DBN with the same design pressure ratio, the EDDBN can further improve the thrust performance of the exhaust system during the mode transition, confirming the application value of the proposed nozzle design.
AB - Expansion–deflection nozzle (EDN) and dual-bell nozzle (DBN) are the designs of altitude compensation nozzles that are currently widely studied. The cold flow subscale experiments and two-dimensional axisymmetric Reynolds-averaged numerical simulations were performed to explore the flow characteristics and the altitude compensation performance of an expansion–deflection dual-bell nozzle (EDDBN), which combines an EDN and DBN. The experimental results, supported by numerical simulation results, showed that the EDDBN is in the sea level closed mode under the experimental nozzle pressure ratios. The transition characteristics of the EDDBN and the DBN were simulated by continuously changing the nozzle inlet total pressure. In wider ranges of nozzle pressure ratios, owing to the lower wall pressure of the extension nozzle, the EDDBN has a higher mode transition pressure ratio than the DBN. Compared with the DBN with the same design pressure ratio, the EDDBN can further improve the thrust performance of the exhaust system during the mode transition, confirming the application value of the proposed nozzle design.
KW - Altitude compensation
KW - Cold flow nozzle experiment
KW - Expansion–deflection dual-bell nozzle
KW - Transition
UR - https://www.scopus.com/pages/publications/85126297675
U2 - 10.1016/j.ast.2022.107464
DO - 10.1016/j.ast.2022.107464
M3 - 文章
AN - SCOPUS:85126297675
SN - 1270-9638
VL - 123
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
M1 - 107464
ER -