20 khz 3D measurements in a mach-2 cavity combustor based on tomographic chemiluminescence

Qingchun Lei, Yue Wu, Wenjiang Xu, Lin Ma, Timothy M. Ombrello, Campbell D. Carter

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This work reports a study of the ignition processes in a Mach-2 cavity combustor using a three-dimensional (3D) diagnostic with 20 kHz temporal resolution. The diagnostic was based on a combination of tomographic chemiluminescence (TC) and fiber-based endoscopes (FBEs). Customized FBEs were employed to capture line-of-sight integrated chemiluminescence images (termed projections) of the combustor from 8 different orientations simultaneously at 20 kHz. The measured projections were then used in a tomographic algorithm to obtain 3D reconstructions of flame structures. Based on the 3D reconstructions, 3D volume of ignition kernels was extracted to further study the ignition processes. The 3D volume measurements clearly distinguished the ignition stage from the stable combustion stage of the combustor and enabled the determination of a transition time to quantify both stages. These results demonstrated the utility of the 3D diagnostics to overcome some of the limitations of established planar diagnostics and to resolve the dynamics of high-speed combustion devices both spatially and temporally.

Original languageEnglish (US)
Title of host publication32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Pages1-6
Number of pages6
ISBN (Print)9781624104381
StatePublished - Jan 1 2016
Event32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2016 - Washington, United States
Duration: Jun 13 2016Jun 17 2016

Publication series

Name32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference

Other

Other32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2016
CountryUnited States
CityWashington
Period6/13/166/17/16

    Fingerprint

Cite this

Lei, Q., Wu, Y., Xu, W., Ma, L., Ombrello, T. M., & Carter, C. D. (2016). 20 khz 3D measurements in a mach-2 cavity combustor based on tomographic chemiluminescence. In 32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference (pp. 1-6). (32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference). American Institute of Aeronautics and Astronautics Inc, AIAA.