Mixing characteristics of cracked gaseous hydrocarbon fuels in a scramjet combustor

Magesh Ravindran, Mathew Bricalli, Adrian Pudsey, Hideaki Ogawa

Research output: Contribution to journalArticle

Abstract

High-performance hydrocarbon-fuelled scramjet engines require efficient fuel-air mixing due to the relatively short flow residence time through the combustor. At high temperatures, hydrocarbon fuels react endothermically and absorb thermal energy from the surroundings. The process known as cracking becomes essential at high Mach numbers to increase the total heat-sink capacity of the fuel. This study presents the results of chemically frozen numerical simulations that investigate the mixing characteristics of cracked gaseous heavy hydrocarbon fuels injected through a circular, flush-wall porthole injector. The mixing characteristics of fuel compositions representing cracking efficiencies ranging from 0 to 100% are investigated. The mixing rates and flow structures are found to change with fuel compositions. As the cracking increases, the mixing and streamwise circulation increase for an injectant. However, the jet penetration and stagnation pressure losses decrease. The streamwise circulation is found to have a strong influence on the mixing, the injection pressure on the jet penetration and the strength of the bow shock on stagnation pressure losses. Overall, it is shown that there are mixing benefits to be gained by injecting cracked hydrocarbon fuels compared to heavy uncracked fuels in scramjets.

Original languageEnglish
Pages (from-to)168-184
Number of pages17
JournalActa Astronautica
Volume162
DOIs
Publication statusPublished - Sep 1 2019

Fingerprint

Combustors
Hydrocarbons
Residual fuels
Heat sinks
Flow structure
Thermal energy
Chemical analysis
Mach number
Enthalpy
Engines
Computer simulation
Air

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

Mixing characteristics of cracked gaseous hydrocarbon fuels in a scramjet combustor. / Ravindran, Magesh; Bricalli, Mathew; Pudsey, Adrian; Ogawa, Hideaki.

In: Acta Astronautica, Vol. 162, 01.09.2019, p. 168-184.

Research output: Contribution to journalArticle

Ravindran, Magesh ; Bricalli, Mathew ; Pudsey, Adrian ; Ogawa, Hideaki. / Mixing characteristics of cracked gaseous hydrocarbon fuels in a scramjet combustor. In: Acta Astronautica. 2019 ; Vol. 162. pp. 168-184.
@article{d5927c8b626c4252a743ead4a59ab363,
title = "Mixing characteristics of cracked gaseous hydrocarbon fuels in a scramjet combustor",
abstract = "High-performance hydrocarbon-fuelled scramjet engines require efficient fuel-air mixing due to the relatively short flow residence time through the combustor. At high temperatures, hydrocarbon fuels react endothermically and absorb thermal energy from the surroundings. The process known as cracking becomes essential at high Mach numbers to increase the total heat-sink capacity of the fuel. This study presents the results of chemically frozen numerical simulations that investigate the mixing characteristics of cracked gaseous heavy hydrocarbon fuels injected through a circular, flush-wall porthole injector. The mixing characteristics of fuel compositions representing cracking efficiencies ranging from 0 to 100{\%} are investigated. The mixing rates and flow structures are found to change with fuel compositions. As the cracking increases, the mixing and streamwise circulation increase for an injectant. However, the jet penetration and stagnation pressure losses decrease. The streamwise circulation is found to have a strong influence on the mixing, the injection pressure on the jet penetration and the strength of the bow shock on stagnation pressure losses. Overall, it is shown that there are mixing benefits to be gained by injecting cracked hydrocarbon fuels compared to heavy uncracked fuels in scramjets.",
author = "Magesh Ravindran and Mathew Bricalli and Adrian Pudsey and Hideaki Ogawa",
year = "2019",
month = "9",
day = "1",
doi = "10.1016/j.actaastro.2019.06.010",
language = "English",
volume = "162",
pages = "168--184",
journal = "Acta Astronautica",
issn = "0094-5765",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Mixing characteristics of cracked gaseous hydrocarbon fuels in a scramjet combustor

AU - Ravindran, Magesh

AU - Bricalli, Mathew

AU - Pudsey, Adrian

AU - Ogawa, Hideaki

PY - 2019/9/1

Y1 - 2019/9/1

N2 - High-performance hydrocarbon-fuelled scramjet engines require efficient fuel-air mixing due to the relatively short flow residence time through the combustor. At high temperatures, hydrocarbon fuels react endothermically and absorb thermal energy from the surroundings. The process known as cracking becomes essential at high Mach numbers to increase the total heat-sink capacity of the fuel. This study presents the results of chemically frozen numerical simulations that investigate the mixing characteristics of cracked gaseous heavy hydrocarbon fuels injected through a circular, flush-wall porthole injector. The mixing characteristics of fuel compositions representing cracking efficiencies ranging from 0 to 100% are investigated. The mixing rates and flow structures are found to change with fuel compositions. As the cracking increases, the mixing and streamwise circulation increase for an injectant. However, the jet penetration and stagnation pressure losses decrease. The streamwise circulation is found to have a strong influence on the mixing, the injection pressure on the jet penetration and the strength of the bow shock on stagnation pressure losses. Overall, it is shown that there are mixing benefits to be gained by injecting cracked hydrocarbon fuels compared to heavy uncracked fuels in scramjets.

AB - High-performance hydrocarbon-fuelled scramjet engines require efficient fuel-air mixing due to the relatively short flow residence time through the combustor. At high temperatures, hydrocarbon fuels react endothermically and absorb thermal energy from the surroundings. The process known as cracking becomes essential at high Mach numbers to increase the total heat-sink capacity of the fuel. This study presents the results of chemically frozen numerical simulations that investigate the mixing characteristics of cracked gaseous heavy hydrocarbon fuels injected through a circular, flush-wall porthole injector. The mixing characteristics of fuel compositions representing cracking efficiencies ranging from 0 to 100% are investigated. The mixing rates and flow structures are found to change with fuel compositions. As the cracking increases, the mixing and streamwise circulation increase for an injectant. However, the jet penetration and stagnation pressure losses decrease. The streamwise circulation is found to have a strong influence on the mixing, the injection pressure on the jet penetration and the strength of the bow shock on stagnation pressure losses. Overall, it is shown that there are mixing benefits to be gained by injecting cracked hydrocarbon fuels compared to heavy uncracked fuels in scramjets.

UR - http://www.scopus.com/inward/record.url?scp=85067299827&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85067299827&partnerID=8YFLogxK

U2 - 10.1016/j.actaastro.2019.06.010

DO - 10.1016/j.actaastro.2019.06.010

M3 - Article

AN - SCOPUS:85067299827

VL - 162

SP - 168

EP - 184

JO - Acta Astronautica

JF - Acta Astronautica

SN - 0094-5765

ER -