EXPERIMENTAL AND THEORETICAL-STUDIES ON TURBULENT MIXING OF 2 CONFINED JETS

A study of turbulent mixing of two confined jets in a side-dump combustor was carried out with complementary numerical and experimental efforts. The side-inlet angle was varied from 15-degrees to 135-degrees, air-to-fuel ratio from 1.8 to 6.4, and combustor Reynolds number from 1.1 x 10(4) to 5.9 x 10(4), respectively, to investigate their effects on the flow and mixing patterns. The fuel concentration distribution calculated from the temperature measurements using the Mach-Zehnder interferometry and thermocouple probing is in good agreement with that predicted with an algebraic Reynolds stress turbulence model. The side-inlet angle is found to affect largely the dominant role played by the jet impingement or entrainment. The existence of the critical side-inlet angle and Reynolds number and the increase of uniformity of mixing with increasing air-to-fuel ratio are believed to be useful for the design of side-dump combustors.