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Molecular Mixing and Flowfield Measurements in an Expansion-Ramp Combustor: Supersonic Flow

Bonanos, Aristides M. and Bergthorson, Jeffrey M. and Dimotakis, Paul E. (2007) Molecular Mixing and Flowfield Measurements in an Expansion-Ramp Combustor: Supersonic Flow. In: 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. AIAA , Reston, VA, Paper AIAA 2007-5417. ISBN 978-1-62410-011-6. http://resolver.caltech.edu/CaltechAUTHORS:20160602-162603294

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Abstract

This paper studies the level of molecular mixing and aerodynamic effects for supersonic flow in an "air" stream, with variable "fuel" mass injection and chemical heat release, in a flow configuration that has potential utility in dual-mode ramjet/scramjet combustors. "Fuel" is injected through a backward-facing expansion ramp at a rate insufficient to provide the entrainment requirements of the shear layer produced by the flow separation, which attaches to the lower guide wall. Part of the shear layer flow is directed upstream forming a recirculation zone that enhances mixing and provides flameholding benefits. Significant (passive) control authority over the flow is demonstrated by using variable mass injection through the ramp, and also by varying the level of heat release in the flow. molecular mixing was measured employing the hypergolic hydrogen-fluorine chemical reaction. The amount of mixing for the expansion-ramp geometry is found to be higher than in classical free shear layers. However, as in free shear layers, the level of mixing is found to decrease with increasing top-stream velocity.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.2514/6.2007-5417DOIArticle
http://arc.aiaa.org/doi/abs/10.2514/6.2007-5417PublisherArticle
Additional Information:© 2007 by the authors.
Group:GALCIT
Record Number:CaltechAUTHORS:20160602-162603294
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160602-162603294
Official Citation:Aristides Bonanos, Jeffrey Bergthorson, and Paul Dimotakis. "Molecular Mixing and Flowfield Measurements in an Expansion-Ramp Combustor: Supersonic Flow", 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, Joint Propulsion Conferences, http://dx.doi.org/10.2514/6.2007-5417
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67602
Collection:CaltechAUTHORS
Deposited By: Paul Dimotakis
Deposited On:13 Jun 2016 21:38
Last Modified:30 Nov 2016 22:15

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