STABILITY OF SUBSONIC MACRO- AND MICROJET FLOWS AND MICROJET COMBUSTION (REVIEW)

In this review series of works of experimental study of the outflow of gas jets into air are presented. Air, propane, hydrogen were applied as gas of jet. Investigations were carried out for different sizes of round nozzles (from 23 to 0.2 mm) and flat nozzles (from 3000·1.5 to 0.7·0.1 mm), for different velocities in the range of Re numbers for macro-jet ~ 3000–5000, and for micro-jet Re ~ 100–300. Based on the results of the research, the mechanisms of the growth of perturbations in a round and flat macro-jet are determined, and also methods for reduction of hydrodynamic perturbations in jets. The properties of micro jets in the diffusion combustion of various gases are shown, including acoustic excitation of the jet. The features of the diffusion combustion of hydrogen with formation of so-called «constriction» of the flame and two combustion zones are shown.

Keywords:
micro jet, diffusion combustion, propane, hydrogen, bifurcation of jet, Kelvin – Helmholtz instability.
УДК 544.452.42

STABILITY OF SUBSONIC MACRO- AND MICROJET FLOWS AND MICROJET COMBUSTION (REVIEW)