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research-article

INVESTIGATION OF AIR INJECTION AND CAVITY SIZE WITHIN A CIRCUMFERENTIAL COMBUSTOR TO INCREASE G-LOAD AND RESIDENCE TIME

[+] Author and Article Information
Andrew E. Cottle

Department of Aeronautics and Astronautics, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio, USA
aecottle3@gmail.com

Marc D. Polanka

Department of Aeronautics and Astronautics, Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio, USA
marc.polanka@afit.edu

Larry Goss

Innovative Scientific Solutions, Inc., 7610 McEwen Road, Dayton, Ohio, USA
gosslp@innssi.com

Corey Z. Goss

Innovative Scientific Solutions, Inc., 7610 McEwen Road, Dayton, Ohio, USA
coreygoss81@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4037578 History: Received May 26, 2017; Revised July 04, 2017

Abstract

A gas-turbine combustion process subjected to high levels of centrifugal acceleration has demonstrated the potential for increased flame speeds and shorter residence times. Ultra-Compact Combustors invoke the high-g phenomenon by introducing air and fuel into a circumferential cavity which is recessed radially outboard with respect to the primary axial core flow. Upstream air is directed tangentially into the combustion cavity to induce bulk circumferential swirl. Swirl velocities in the cavity produce a centrifugal load on the flow that is typically expressed in terms of gravitational acceleration, or g-loading. AFIT has developed an experimental facility in which g-loads up to 2000 times the earth's gravitational field have been demonstrated. In this study, the flow within the combustion cavity is examined to determine factors and conditions which invoke responses in cavity g-loads. The AFIT experiment was modified to enable optical access into the primary combustion cavity. The techniques of Particle Image Velocimetry, and Particle Streak Emission Velocimetry provided high-fidelity measurements of the velocity fields within the cavity. The experimental data were compared to a set of Computational Fluid Dynamics solutions. Improved cavity air and fuel injection schemes were evaluated over a range of air flows and equivalence ratios. Increased combustion stability was attained by providing a uniform distribution of cavity air drivers. Lean cavity equivalence ratios at a high total airflow resulted in higher g-loads and more complete combustion thereby showing promise for utilization of the UCC as a main combustor.

Section 4: U.S. Gov Employees + Reg Authors
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