Supersonic Combustion in Scramjet Engine

A special issue of Aerospace (ISSN 2226-4310).

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 3711

Special Issue Editors


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Guest Editor
Department of Aerospace Engineering, Pusan National University, Busan 46241, Republic of Korea
Interests: propulsion and combustion phenonmena in rocket, scramjet, and detonation engines; detonation; supersonic combustion; turbulent combustion; supercritical combustion; high-resolution numerical methods; high-performance computing; combustion experiments; visualization of high-speed flows
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Guest Editor
Department of Aerospace Engineering, Inha University, Incheon 21999, Republic of Korea
Interests: ram & scram jet; missile system; hypersonic flows; high speed combustion

Special Issue Information

Dear Colleagues,

Powered hypersonic flight is no longer a dream, but rather, a reality. It has been made possible by several decades of efforts and devotion from our senior colleagues. Nevertheless, it is just the beginning. As always in all engineering fields, continuing innovations at the present level mature the technology from a prototype to military use and then, finally, to civil applications at an affordable cost.

Supersonic combustion in scramjet engines lies at the core of the technologies for powered hypersonic flight. For this Special Issue, authors are invited to contribute high-quality original papers covering the fundamental physics of supersonic combustion, and new developments in technology for scramjet engines. We also welcome papers discussing new theoretical, analytical, experimental, and numerical methods and techniques useful for further understanding and development of supersonic combustion in scramjet engines.

Prof. Dr. Jeong Yeol Choi
Prof. Dr. Hyoung Jin Lee
Guest Editors

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Keywords

  • supersonic combustion
  • scramjet engine
  • fundamental physics
  • new developments
  • experimental techniques
  • numerical methods

Published Papers (2 papers)

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Research

16 pages, 7306 KiB  
Article
Investigation of Spray Characteristics for Detonability: A Study on Liquid Fuel Injector and Nozzle Design
by Myeung Hwan Choi, Yoojin Oh and Sungwoo Park
Aerospace 2024, 11(6), 421; https://doi.org/10.3390/aerospace11060421 - 23 May 2024
Viewed by 514
Abstract
Detonation engines are gaining prominence as next-generation propulsion systems that can significantly enhance the efficiency of existing engines. This study focuses on developing an injector utilizing liquid fuel and a gas oxidizer for application in detonation engines. In order to better understand the [...] Read more.
Detonation engines are gaining prominence as next-generation propulsion systems that can significantly enhance the efficiency of existing engines. This study focuses on developing an injector utilizing liquid fuel and a gas oxidizer for application in detonation engines. In order to better understand the spray characteristics suitable for the pulse detonation engine (PDE) system, an injector was fabricated by varying the Venturi nozzle exit diameter ratio and the geometric features of the fuel injection hole. Analysis of high-speed camera images revealed that the Venturi nozzle exit diameter ratio plays a crucial role in determining the characteristics of air-assist or air-blast atomization. Under the conditions of an exit diameter ratio of Re/Ri = 1.0, the formation of a liquid film at the exit was observed, and it was identified that the film’s length is influenced by the geometric characteristics of the fuel injection hole. The effect of the fuel injection hole and Venturi nozzle exit diameter ratio on SMD was analyzed by using droplet diameter measurement. The derived empirical correlation indicates that the atomization mechanism varies depending on the Venturi nozzle exit diameter ratio, and it also affects the distribution of SMD. The characteristics of the proposed injector, its influence on SMD, and its velocity, provide essential groundwork and data for the design of detonation engines employing liquid fuel. Full article
(This article belongs to the Special Issue Supersonic Combustion in Scramjet Engine)
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15 pages, 18493 KiB  
Article
A Study on a Vitiated Air Heater for a Direct-Connect Scramjet Combustor and Preliminary Test on the Scramjet Combustor Ignition
by Jae-Hyuk Lee, Eun-Sung Lee, Hyung-Seok Han, Min-Su Kim and Jeong-Yeol Choi
Aerospace 2023, 10(5), 415; https://doi.org/10.3390/aerospace10050415 - 28 Apr 2023
Cited by 7 | Viewed by 1976
Abstract
Vitiation air heater (VAH) combustion characteristics for a direct-connect scramjet combustor (DCSC) were experimentally studied. The VAH consists of a head, modular chamber, and circular-to-rectangular shape transition (CRST) nozzle. The CRST nozzle transforms the circular cross-sectioned rocket-type VAH into a rectangular cross-sectioned scramjet [...] Read more.
Vitiation air heater (VAH) combustion characteristics for a direct-connect scramjet combustor (DCSC) were experimentally studied. The VAH consists of a head, modular chamber, and circular-to-rectangular shape transition (CRST) nozzle. The CRST nozzle transforms the circular cross-sectioned rocket-type VAH into a rectangular cross-sectioned scramjet combustor. The CRST nozzle exit Mach numbers at the top, middle, and bottom were measured using a tungsten wedge. The oblique shock formed by the wedge was captured using Schlieren visualization and recorded with a high-speed camera. The θ-β-M relation showed that the exit Mach number was 2.04 ± 0.04 with a chamber pressure of 1.685 ± 0.07 MPa. With the VAH design point verified, preliminary scramjet combustor ignition tests were conducted. As the fuel was not auto-ignited by the vitiated air, the forced ignition method, in which VAH ignition flame ignites the scramjet fuel, was used. The Schlieren images showed that a cavity shear layer combustion mode was formed and also showed that the forced ignition method could be used as a reference model for the ignitor-ignition method. Full article
(This article belongs to the Special Issue Supersonic Combustion in Scramjet Engine)
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