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A new cruciform burner and its turbulence measurements for premixed turbulent combustion study

Authors
Journal
Experimental Thermal and Fluid Science
0894-1777
Publisher
Elsevier
Publication Date
Volume
20
Identifiers
DOI: 10.1016/s0894-1777(99)00035-7
Keywords
  • Isotropic Turbulence
  • Counter-Rotating Fans And Perforated Plates
  • Laser Doppler Velocimetry
  • Turbulent Intensities
  • Eulerian Time Correlation And Spectrum

Abstract

Abstract A new turbulent flow system is proposed for the study of premixed turbulent combustion processes. This cruciform burner consists of two cylindrical vessels. The long vertical vessel can provide a stable downward propagating premixed-flame at one atmosphere. The horizontal vessel was equipped with a pair of motor-driven fans and perforated plates at each end. The fans can generate two intense counter-rotating large vortical streams with controllable fan frequency up to 7620 rpm. It was found that an approximately isotropic stationary turbulence with large turbulent intensities (greater than 450 cm/s) located in the core region between two perforated plates can be generated, as verified by extensive LDV measurements. In that mean velocities are nearly zero, turbulent intensities in all three directions are roughly equal, and the energy spectrum has a −5/3 slope, indicating that the turbulence has some properties of isotropic turbulence. Other parameters of interest, such as the autocorrelation, the integral length scale, and the experimental uncertainties are also reported for the first time. The present turbulence generator can be conveniently adopted for many experimental studies, such as gaseous premixed flames propagation and particle settling in nearly isotropic turbulence.

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