Shear coaxial injector lox droplet measurements as a function of hydrogen injection temperature

Michael M. Micci, David Gandilhon

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A hydrogen gas chiller was designed and fabricated in order to simulate the hydrogen temperature ramping test for liquid rocket engines in a single-element gaseous hydrogen/liquid oxygen combustion chamber. Hot fire PDPA measurements of droplet sizes and velocities as a function of the gaseous hydrogen temperature for a fixed mass flow and shear coaxial injector configuration were obtained as the hydrogen temperature was varied from 130 to 290 K, resulting in a doubling of the hydrogen/oxygen velocity and momentum flux ratios. Measured droplet Sauter and arithmetic mean diameters decreased as the hydrogen temperature increased. However, even though the hydrogen temperature change resulted in a doubling of the velocity and momentum flux ratios, the droplet Sauter mean diameter only decreased by 12.5%. These results indicate that the increase in droplet size as the injected hydrogen temperature is decreased may not be a significant contributor to the resulting combustion instability for liquid rocket engines operating at the conditions examined in this study.

Original languageEnglish (US)
Pages (from-to)85-96
Number of pages12
JournalAtomization and Sprays
Volume18
Issue number1
StatePublished - Jan 1 2008

Fingerprint

injectors
Hydrogen
injection
shear
hydrogen
Temperature
temperature
rocket engines
Rocket engines
Momentum
Liquids
Oxygen
Fluxes
momentum
combustion stability
liquid oxygen
mass flow
combustion chambers
liquids
Combustion chambers

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Cite this

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abstract = "A hydrogen gas chiller was designed and fabricated in order to simulate the hydrogen temperature ramping test for liquid rocket engines in a single-element gaseous hydrogen/liquid oxygen combustion chamber. Hot fire PDPA measurements of droplet sizes and velocities as a function of the gaseous hydrogen temperature for a fixed mass flow and shear coaxial injector configuration were obtained as the hydrogen temperature was varied from 130 to 290 K, resulting in a doubling of the hydrogen/oxygen velocity and momentum flux ratios. Measured droplet Sauter and arithmetic mean diameters decreased as the hydrogen temperature increased. However, even though the hydrogen temperature change resulted in a doubling of the velocity and momentum flux ratios, the droplet Sauter mean diameter only decreased by 12.5{\%}. These results indicate that the increase in droplet size as the injected hydrogen temperature is decreased may not be a significant contributor to the resulting combustion instability for liquid rocket engines operating at the conditions examined in this study.",
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Shear coaxial injector lox droplet measurements as a function of hydrogen injection temperature. / Micci, Michael M.; Gandilhon, David.

In: Atomization and Sprays, Vol. 18, No. 1, 01.01.2008, p. 85-96.

Research output: Contribution to journalArticle

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