EFFECT OF SWIRL ON THE COMBUSTION OF A HOMOGENEOUS MIXTURE IN A CLOSED VESSEL. (2ND REPORT, BURNING VELOCITY AND BURNING ZONE THICKNESS OF TURBULENT FLAMES).

In order to reveal the effect of turbulence on the combustion process of a propane-air mixture, a turbulent flame propagating nearly axisymmetrically was produced in a disc type combustion chamber. The velocity and turbulence of the gas flow in the combustion chamber were measured with a two-dimensional LDA system. The configuration and propagation speed of the flame were measured with high-speed laser schlieren photography and an ion-probe. From these measurement results, the burning velocity S//T and the burning zone thickness delta //T of turbulent flames were determined successfully under various conditions of turubulence intensity. As a result, it was recognized that the value of S//T increased with increasing turbulence intensity and delta //T increased with S//T.