Measuring physical flow properties, such as density and temperature, at high frequency in high temperature and pressure environments is very challenging. Rapid fluctuations of these properties often have an impact on combustion efficiency and stability. We hereby attempt to measure density fluctuations in high-pressure premixed combustion using high temporal resolution laser Rayleigh scattering. The Rayleigh scattering intensity was assessed by counting individual photons due to the low signal to noise ratio. The measurement system was first verified at various air pressures without combustion. Combustion experiments were then conducted at four different pressures, from 1 to 7 bar. The density fluctuations increased with pressure, but the dominant fluctuation frequency decreased. Proper orthogonal decomposition analysis of high-speed schlieren images of the flame front was used to verify the results.
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August 2022
Letter|
August 08 2022
High frequency Rayleigh scattering measurements of density fluctuations in high-pressure premixed combustion
Special Collection:
Light, X-ray, and Neutron Scattering of Flow
Han June Park (박한준);
Han June Park (박한준)
(Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft)
Department of Mechanical Engineering, Seoul National University
, Seoul 08826, South Korea
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Sangeun Bae (배상은)
;
Sangeun Bae (배상은)
(Data curation, Investigation, Resources)
Department of Mechanical Engineering, Seoul National University
, Seoul 08826, South Korea
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Hyungrok Do (도형록);
Hyungrok Do (도형록)
(Conceptualization, Funding acquisition, Project administration, Supervision)
Department of Mechanical Engineering, Seoul National University
, Seoul 08826, South Korea
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Wontae Hwang (황원태)
Wontae Hwang (황원태)
a)
(Conceptualization, Funding acquisition, Project administration, Supervision, Writing – review & editing)
Department of Mechanical Engineering, Seoul National University
, Seoul 08826, South Korea
a)Author to whom correspondence should be addressed: wthwang@snu.ac.kr
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a)Author to whom correspondence should be addressed: wthwang@snu.ac.kr
Note: This paper is part of the special topic, Light, X-ray, and Neutron Scattering of Flow.
Physics of Fluids 34, 081701 (2022)
Article history
Received:
June 09 2022
Accepted:
July 09 2022
Citation
Han June Park, Sangeun Bae, Hyungrok Do, Wontae Hwang; High frequency Rayleigh scattering measurements of density fluctuations in high-pressure premixed combustion. Physics of Fluids 1 August 2022; 34 (8): 081701. https://doi.org/10.1063/5.0102330
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