ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
CONVECTIVE HEAT TRANSFER FROM LAMINAR AND TURBULENT PREMIXED FLAMES
Resumo
Stagnation point heat transfer rates have
been measured from natural gas-air flames impinging
normally onto a plane surface. The flames
were supported on several types of premixed gas
burner and a nozzle burner which had provision for
the insertion of turbulence promotion grids.
Schlieren photography was used to characterise the
flame structure. The experimental results for the
axial variation in heat transfer were compared to
those calculated from a semi-empirical heat transfer
theory. The axial heat transfer variation
could not be correlated on a simple similarity
basis and the results for the tip of the inner
cone showed wide differences depending upon burner
type. These differences were related to the turbulence
structure of the free firing flames and
hence the burner design.