Session: 04-26 Atomization and Spray Combustion II
Paper Number: 123973
123973 - Temperature Field Measurements in Swirl Spray Flames Using Two-Line Planar Laser Induced Fluorescence Thermometry
This paper investigates the temperature fields in a centrally-staged swirl spray combustor using two-line OH planar laser induced fluorescence (PLIF) thermometry at elevated inlet pressures and temperatures up to 0.62 MPa and 544 K. The pilot and main stages of the combustor were supplied with RP-3 kerosene. OH radicals were excited using the Q1(5) and Q1(14) transitions within the A2Σ←X2Π(1,0) band. Two laser excitation systems were operated simultaneously, where the two beams were combined using a half-wave plate and a thin-film polarizer. The PLIF signals excited from the two wavelengths were captured by two identical sets of camera/intensifier. Under the low pressure, we considered the absorption along path in the PLIF images. To improve the quality of instantaneous temperature fields, a joint threshold mask was adopted to remove the weak signals in the raw PLIF images. The calibration coefficient needed for quantitative conversion to temperature was determined based on results from coherent anti-Stokes Raman scattering (CARS) measurements. The high-temperature zone (HTZ) in temperature field was then obtained. In both instantaneous and mean temperature fields, the pilot and main stage flames were identified. In addition, the lift-off distance of the pilot flame showed marked variations at a nominally fixed condition. By extracting the radial and axial distribution curves, a consistency between the peaks of PLIF intensity and temperature was found, suggesting that PLIF images could qualitatively replace the HTZ in temperature field in these complex swirl spray flames. This study provides strong experimental support for understanding the temperature fields in low-emissions aero-engine combustors.
Presenting Author: Chao Tao Beihang University
Presenting Author Biography: Chao Tao is a Ph.D. student in the Research Institute of Aero-Engine at Beihang University. Mr. Tao completed B.Eng. (2019) degree in aircraft power engineering at Xiamen Universtiy. His research interests include the flow-flame interaction mechanism, reacting flow field/temperature field measurement, and combustion instability in aero-engine model combustors at complex conditions.
Authors:
Chao Tao Beihang UniversityChi Zhang Beihang University
Qiang An Beihang University
Xin Xue Beihang University
Temperature Field Measurements in Swirl Spray Flames Using Two-Line Planar Laser Induced Fluorescence Thermometry
Paper Type
Technical Paper Publication