Optical study of a 2-dimensional laminar flame: Relation between temperature and flow-velocity fields

Experimental study of limit lean methane/air flame in a standard flammability tube using particle image velocimetry method

“…For steady constant pressure flames, the temperature evaluation by the measured velocity field is, in principle, possible based on the constancy of the gas mass flow through any cross-section of a stream tube, and the ideal gas equation of state. Under these assumptions the equation relating local gas velocity, local gas temperature, and stream tube cross-section along a stream tube can be obtained [12]:…”

“…If gas temperature T 0 at some location of the stream tube is known, temperature at any other stream tube location can be found from Eq. (1) [12] : In the case of a steady-state flame propagating in a tube, such a location can be selected upstream the flame, where the mixture has room temperate T 0 . Using variables illustrated by the Fig.…”

The Particle Image Velocimetry Experimental Study of Flame Extinction in Standard Square Flammability Column Resulting From Stretching

“…Important methodology contributions, which can be used in the PIV picture processing, to obtain the local stretching rates from the PIV vector velocity pictures, are presented in [22] and employed elsewhere [28,[35][36][37]. The latter consider detailed analysis related to the lean limit flame movement, and uses a standard flammability tube, focusing on the temperature field analysis in the CH 4 /air mixture only.…”

“…A significant part of the experimental problems mentioned is not present in the square-cross-section channel with plane walls. The main idea presented in [7] and [22] has also been used in the work reported in this paper. It is based on the link-not only theoretical but in fact present in the PIV measurements-between velocity and temperature fields in the flame front undergoing stretching.…”

“…In the second part of the last century important works, both theoretical and experimental, were published (see monographs [6,7] and those related to the present paper [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]). After the introduction of flame stretch and preferential diffusion concepts, better understanding and progress could have been made.…”