난류 예혼합 화염의 미연가스 영역 난류 특성

Abstract

Measured turbulence properties of methane/air premixed flame was presented. Two-color laser velocimeter was used to obtain simultaneous statistics of vertical velocity components of open jet burner within unburned gas region. Same set of measurements was repeated at 21 locations to investigate the spatial variation of the turbulence properties. Test condition was at Reynolds number of 7,000 and fuel equivalence ratio 0.6 and 1.0. Time records of instantaneous velocities were reduced to obtain mean velocities, Reynolds stress, probability densities, and joint probabilities. The Cane affected all the turbulence properties in the unburned gas region. The finding strongly suggests that volume expansion at the Came surface is responsible for the changes in turbulence properties. Present finding also implies that the existing models assuming invariant turbulence properties can be improved by accounting for this effect.