An aerosol rapid compression machine for studying energetic-nanoparticle- enhanced combustion of liquid fuels

Casey Allen, Gaurav Mittal, Chih Jen Sung, Elisa Toulson, Tonghun Lee

Research output: Contribution to journalArticlepeer-review

Abstract

The use of energetic nanoparticles offers a promising means of adjusting the reactivity of liquid fuels for enhanced combustion stability in next generation propulsion systems. This work outlines the development of a novel aerosol rapid compression machine (RCM) for studying the impact of energetic nanoparticles on reducing the ignition delay of liquid fuels, and a proof-of-concept demonstration is presented using ethanol and JP-8. Fuel droplets are generated using an ultrasonic nozzle. The seeding of 50 nm aluminum nanoparticles in the liquid fuel is achieved by using a combination of chemical surfactants in addition to mixing in an ultrasonic bath. The autoignition delay is measured for neat and nanoparticle-enhanced mixtures at compressed conditions of 772-830 K and 12-28 bar in the RCM. The results show that significant changes in the ignition delay can be observed using a low concentration (2%-weight) of energetic nanoparticles. For ethanol and JP-8, ignition delays were reduced by 32% and 50%, respectively. Measurements to verify the uniformity of aerosol dispersion in the RCM, the reproducibility of the RCM data, and a method for approximating compressed temperature are also presented.

Original languageEnglish (US)
Pages (from-to)3367-3374
Number of pages8
JournalProceedings of the Combustion Institute
Volume33
Issue number2
DOIs
StatePublished - 2011
Externally publishedYes

Keywords

  • Autoignition
  • Energetically-enhanced combustion
  • Ethanol
  • JP-8
  • Nanoparticle

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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