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(Manuscript Received on December 01 st , 2008, Manuscript Revised April 25 th , 2009) ABSTRACT: In the present study, a technique making expanding spherical flames in a constant volume combustion bomb is presented for determining burning velocities of unstretched laminar flames, and applied to liquefy petroleum gas (LPG)-air mixtures. The experimental setup consists of a cylindrical combustion chamber coupled to a classical schlieren system. Flame pictures are recorded by a high speed camera. The laminar burning velocities of LPG-air mixtures are measured over a wide range of preheat temperatures, initial pressures and equivalence ratios. The effects of these initial conditions on the laminar burning velocities are also examined in this paper.

USING EXPANDING SPHERICAL FLAMES METHOD TO MEASURE THE UNSTRETCHED LAMINAR BURNING VELOCITIES OF LPG-AIR MIXTURES