Turbulence statistics in premixed methane/air flames stabilized by a stagnation plate have been measured using the two-component laser Doppler velocimetry technique. Experimental conditions cover equivalence ratios of 0.67 to 1.16, incident turbulence intensities of 0.1 to 0.7 m/s, and global stretch rates of 100 to 230 sec-1. Results on turbulence statistics show that in crossing the flame the increase in fluctuation is more pronounced in the normal component while the Reynolds stress remains almost zero, and that the velocity joint probability density function is bimodal for rich flames and mono-modal for lean flames. It is also demonstrated that the present stagnation flame configuration can be usefully applied for the determination, of the turbulent flame speed ST. Values of ST determined as functions of the equivalence ratio and turbulence intensity agree well with those in the literture. It is suggested that the stagnation flame offers potential as a viable configuration for the study of planar, turbulent premixed flames uncomplicated by fluctuations generated by the stabilization regions associated with the conventional conical Bunsen flames and V-flames.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Mechanical Engineering
- Physical and Theoretical Chemistry
- Fluid Flow and Transfer Processes