DIFFUSION COMBUSTION OF PLANE HYDROGEN MICROJET EFFLUX FROM SLOTTED MICRONOZZLE AT SUB- AND SUPERSONIC VELOCITY

Read more The purpose of this work is experimental study of the plane hydrogen microjet diffusion combustion efflux from slotted micronozzle at sub - and supersonic velocity. As a result of these studies the following results are received. For the first time, four scenarios of the plane hydrogen microjet diffusion combustion, including supersonic combustion in the presence of supersonic cells as by air, and on hydrogen are found. It is shown that stabilization of subsonic combustion of the hydrogen microjet is connected with existence of «bottleneck flame region». On the other hand, stabilization of supersonic combustion of the hydrogen microjet is connected with existence of the supersonic cells. The hysteresis of the plane hydrogen microjet diffusion combustion depending on microjet ignition (near or far from a nozzle exit) and direction of its velocity efflux change (growth or reduction) is found.

Keywords:
hydrogen plane microjet, diffusion combustion, «bottleneck flame region», mean velocity profile, sub – and supersonic combustion, hysteresis.
УДК 544.452.42

DIFFUSION COMBUSTION OF PLANE HYDROGEN MICROJET EFFLUX FROM SLOTTED MICRONOZZLE AT SUB- AND SUPERSONIC VELOCITY