Large Eddy Simulation of Ramjet to Scramjet Transition
(2022) 33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022 In 33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022 6. p.4513-4527- Abstract
The dual-mode ramjet engine is one of the most promising propulsion systems for hypersonic flight because it can be operated in a wide range of flight Mach numbers. This engine type will be quite complicated to use in practice since it requires Ma<2 and therefore needs to be complemented by a turbojet engine for take-off, landing and low speed maneuvering. The dual mode ramjet engine will operate in a thermally choked ramjet mode for moderate speeds with 3<Ma<4 and in a supersonic ramjet (scramjet) mode for high speeds with 5<Ma<8. Between these speed ranges the engines need to transition from one operating mode to another. The first transition, turbojet to ramjet, has not been extensively examined but is considered... (More)
The dual-mode ramjet engine is one of the most promising propulsion systems for hypersonic flight because it can be operated in a wide range of flight Mach numbers. This engine type will be quite complicated to use in practice since it requires Ma<2 and therefore needs to be complemented by a turbojet engine for take-off, landing and low speed maneuvering. The dual mode ramjet engine will operate in a thermally choked ramjet mode for moderate speeds with 3<Ma<4 and in a supersonic ramjet (scramjet) mode for high speeds with 5<Ma<8. Between these speed ranges the engines need to transition from one operating mode to another. The first transition, turbojet to ramjet, has not been extensively examined but is considered manageable since the turbojet engine can be easily throttled. The second transition, ramjet to scramjet, is extremely challenging and hard to control since it is governed by the aerothermodynamics alone. In this study we have performed Large Eddy Sim¬ulations (LES) to support a previous experimental study by Fotia & Driscoll which aimed at improving the understanding of ramjet to scramjet transition. We present comparisons with experimental data and data analytics to both validate the simulation and to extract new information about the flow and combustion physics involved in the mode transition. Good agreement with the experimental data is obtained, and the simulation results support the existing knowledge regarding the transition process and provides detailed information regarding the change in flame stabilization modes between the different states.
(Less)
- author
- Nilsson, T. LU and Fureby, C. LU
- organization
- publishing date
- 2022
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Dual mode ramjet, Hydrogen combustion, Large Eddy Simulation, Ramjet to scramjet transition
- host publication
- 33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022
- series title
- 33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022
- volume
- 6
- pages
- 15 pages
- publisher
- International Council of the Aeronautical Sciences
- conference name
- 33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022
- conference location
- Stockholm, Sweden
- conference dates
- 2022-09-04 - 2022-09-09
- external identifiers
-
- scopus:85159691163
- ISBN
- 9781713871163
- language
- English
- LU publication?
- yes
- id
- e86a30a1-edd4-4948-a6b5-7a7734576656
- date added to LUP
- 2023-10-04 13:45:35
- date last changed
- 2025-04-04 14:26:42
@inproceedings{e86a30a1-edd4-4948-a6b5-7a7734576656,
abstract = {{<p>The dual-mode ramjet engine is one of the most promising propulsion systems for hypersonic flight because it can be operated in a wide range of flight Mach numbers. This engine type will be quite complicated to use in practice since it requires Ma<2 and therefore needs to be complemented by a turbojet engine for take-off, landing and low speed maneuvering. The dual mode ramjet engine will operate in a thermally choked ramjet mode for moderate speeds with 3<Ma<4 and in a supersonic ramjet (scramjet) mode for high speeds with 5<Ma<8. Between these speed ranges the engines need to transition from one operating mode to another. The first transition, turbojet to ramjet, has not been extensively examined but is considered manageable since the turbojet engine can be easily throttled. The second transition, ramjet to scramjet, is extremely challenging and hard to control since it is governed by the aerothermodynamics alone. In this study we have performed Large Eddy Sim¬ulations (LES) to support a previous experimental study by Fotia & Driscoll which aimed at improving the understanding of ramjet to scramjet transition. We present comparisons with experimental data and data analytics to both validate the simulation and to extract new information about the flow and combustion physics involved in the mode transition. Good agreement with the experimental data is obtained, and the simulation results support the existing knowledge regarding the transition process and provides detailed information regarding the change in flame stabilization modes between the different states.</p>}},
author = {{Nilsson, T. and Fureby, C.}},
booktitle = {{33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022}},
isbn = {{9781713871163}},
keywords = {{Dual mode ramjet; Hydrogen combustion; Large Eddy Simulation; Ramjet to scramjet transition}},
language = {{eng}},
pages = {{4513--4527}},
publisher = {{International Council of the Aeronautical Sciences}},
series = {{33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022}},
title = {{Large Eddy Simulation of Ramjet to Scramjet Transition}},
volume = {{6}},
year = {{2022}},
}