"Measurements of temperature, pressure, velocity, and frequency in an u" by Brian T. Bohan, Marc D. Polanka et al. 10.2514/6.2018-1875">
 

Measurements of temperature, pressure, velocity, and frequency in an ultra compact combustor

Document Type

Conference Proceeding

Publication Date

1-8-2018

Abstract

The Ultra Compact Combustor (UCC) is an innovative combustor system that utilizes highly centripetally loaded combustion in a recessed circumferential cavity to decrease the size of the combustor compared to a traditional axial combustor in jet engines while providing an increase in engine performance. The Air Force Institute of Technology (AFIT) has been conducting experimental tests with an atmospheric pressure UCC test rig. A variable geometry diffuser has been designed, tested, and characterized to enable the total air inlet mass flow split between the core and circumferential cavity to be dynamically controlled. Using this new capability two test series were conducted. The first was to determine if a constant cavity inlet air mass flow rate could be maintained independent of the total inlet flow rate. The second maintained a constant core-to-cavity mass flow rate ratio to determine differences compared to the constant mass flow rate cases. All testing was conducted at a lean and rich equivalence ratio which represented the normal operating bounds of the combustor and at four total air inlet mass flow rates. Distributed pressure, cavity temperature, exit temperature, and high-speed chemiluminescence data were captured for all test points. The diffuser was successful at maintaining constant cavity properties during the first test series which also produced reasonably constant cavity temperatures, velocities, and frequencies. For the constant core-to-cavity split ratio cases trends were identified in cavity temperature, exit temperature profiles, Rayleigh losses, circumferential velocity, and combustion frequencies which varied depending on the quantity of fuel in the system.

Comments

This conference paper is available from the publisher, AIAA, through subscription or purchase using the DOI link below.

Conference Session: Combustors

AIAA paper 2018-1875

Author note: Brian Bohan was an AFIT PhD candidate at the time of this conference. (AFIT-ENY-DS-18-S-057, September 2018).

Source Publication

AIAA Aerospace Sciences Meeting, 2018

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