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Direct numerical simulation of high-pressure free jets

Sharan, Nek and Bellan, Josette R. (2021) Direct numerical simulation of high-pressure free jets. In: AIAA Scitech 2021 Forum. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2021-0550. ISBN 9781624106095. https://resolver.caltech.edu/CaltechAUTHORS:20210112-105612042

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Abstract

Understanding turbulent round-jet flow dynamics at supercritical pressures is crucial to controlling fuel-oxidizer mixing and combustion in numerous propulsion systems. To that end, direct numerical simulations (DNS) of round jets are performed to discern the differences between turbulence and mixing characteristics at atmospheric and supercritical conditions. Single-species isothermal jets, with Nitrogen (N₂) injected into N₂ at same temperature, are considered at Reynolds number (Re_{D}), based on jet diameter (D) and jet-exit velocity (U_e), of 5000. To understand mixing characteristics, a passive scalar with unity Schmidt number is transported with the flow. For supercritical conditions, the compressible flow equations with the Peng-Robinson equation of state are solved to examine the influence of thermodynamic compressibility, quantified by the compressibility factor (Z), on jet-flow dynamics. The results show that decreasing Z at a fixed supercritical ambient pressure (p_∞) enhances the pressure and density fluctuations (non-dimensionalized by the local mean pressure and density, respectively), but the effect on velocity fluctuations depends also on local flow dynamics characterized by mean strain rates.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2021-0550DOIArticle
ORCID:
AuthorORCID
Sharan, Nek0000-0002-7274-8232
Bellan, Josette R.0000-0001-9218-7017
Additional Information:© 2021 by California Institute of Technology. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
Group:GALCIT
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2021-0550
Record Number:CaltechAUTHORS:20210112-105612042
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210112-105612042
Official Citation: Direct numerical simulation of high-pressure free jets. Nek Sharan and Josette R. Bellan. AIAA Scitech 2021 Forum. January 2021; DOI: 10.2514/6.2021-0550
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107434
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:12 Jan 2021 19:08
Last Modified:12 Jan 2021 19:08

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