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Direct Numerical Simulations of O_2/H_2 Temporal Mixing Layers Under Supercritical Conditions

Okong'o, Nora and Harstad, Kenneth and Bellan, Josette (2002) Direct Numerical Simulations of O_2/H_2 Temporal Mixing Layers Under Supercritical Conditions. AIAA Journal, 40 (5). pp. 914-926. ISSN 0001-1452. http://resolver.caltech.edu/CaltechAUTHORS:20171023-144446319

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Abstract

Direct numerical simulations of a supercritical oxygen/hydrogen temporal three-dimensional mixing layer are conducted to explore the features of high-pressure transitional mixing behavior. The conservation equations are formulated according to fluctuation–dissipation theory and are coupled to a modified Peng–Robinson equation of state. The boundary conditions are periodic in the streamwise and spanwise directions and of nonreflecting outflow type in the cross-stream direction. Simulations are conducted with initial Reynolds numbers of 6 x 10^2 and 7.5 x 10^2, initial pressure of 100 atm, and temperatures of 400 K in the O_2 and 600 K in the H_2 stream. Each simulation encompasses the rollup and pairing of four initial spanwise vortices into a single vortex. The layer eventually exhibits distorted regions of high density-gradient-magnitude similar to the experimentally observed wisps of fluid at the boundary of supercritical jets. Analysis of the data reveals that the higher-Reynolds-number layer reaches transition, whereas the other one does not. The transitional layer is analyzed to elucidate its characteristics.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/2.1728DOIArticle
https://arc.aiaa.org/doi/10.2514/2.1728PublisherArticle
Additional Information:© 2001 by the California Institute of Technology. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Received 13 March 2001; revision received 14 September 2001; accepted for publication 17 October 2001. This work was conducted at the Jet Propulsion Laboratory (JPL), California Institute of Technology, and was sponsored by the NASA Marshall Space Flight Center, under the direction of John Hutt. The computational resources were provided by the JPL Supercomputing Center.
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NASA/JPL/CaltechUNSPECIFIED
Record Number:CaltechAUTHORS:20171023-144446319
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171023-144446319
Official Citation:Direct Numerical Simulations of O2/H2 Temporal Mixing Layers Under Supercritical Conditions Nora Okong', o, Kenneth Harstad, and Josette Bellan AIAA Journal 2002 40:5, 914-926
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82594
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Oct 2017 20:57
Last Modified:24 Oct 2017 20:57

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