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Turbulent mixing in supercritical jets: effect of compressibility factor and inflow condition

Sharan, Nek and Bellan, Josette R. (2020) Turbulent mixing in supercritical jets: effect of compressibility factor and inflow condition. In: AIAA Scitech 2020 Forum. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2020-1156. ISBN 978-1-62410-595-1. https://resolver.caltech.edu/CaltechAUTHORS:20200113-083457410

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Abstract

Fuel injection and turbulent mixing at supercritical pressures determines ignition and combustion in numerous engineering applications. Flow evolution under such conditions is characterized by strong non-linear coupling between dynamics, transport coefficients, and thermodynamics. Experimental studies observe that the jets injected at supercritical pressures exhibit significantly different dynamics from the jets at subcritical conditions, owing to the lack of distinct liquid and gas phases in supercritical state. Thus, the averaged flow quantities such as the potential core length, jet spatial growth rate and velocity decay profiles differ in the two conditions, resulting in different mixed-fluid distributions. In this study, turbulent jet direct numerical simulations (DNS) are performed to examine the variations in flow statistics between injection of Nitrogen (N₂) in Nitrogen (N₂) at both subcritical (perfect-gas) and supercritical conditions. In all cases, isothermal round jets at Reynolds number (Re_{D}), based on jet diameter (D) and jet orifice velocity (U₀), of 5000 are considered. For mixing analyses, a passive scalar transported with the flow is examined.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2020-1156DOIArticle
ORCID:
AuthorORCID
Sharan, Nek0000-0002-7274-8232
Bellan, Josette R.0000-0001-9218-7017
Additional Information:© 2020 American Institute of Aeronautics and Astronautics. Published Online: 5 Jan 2020.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2020-1156
Record Number:CaltechAUTHORS:20200113-083457410
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200113-083457410
Official Citation:Turbulent mixing in supercritical jets: effect of compressibility factor and inflow condition. Nek Sharan and Josette R. Bellan. AIAA Scitech 2020 Forum. January 2020; doi: 10.2514/6.2020-1156
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100662
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jan 2020 17:20
Last Modified:13 Jan 2020 17:20

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