Device for ejecting a diphasic mixture

摘要

A device for ejecting an at least diphasic mixture includes an injection inlet for a liquid and a gas, a distribution chamber for producing a first liquid-gas mixture, an ejection nozzle of the first liquid-gas mixture in a main direction defined by an axis-vector. The ejection nozzle has a geometry comprising, on its length at least, a minimal section or neck at a location of the axis-vector. Among others things, due to the nozzle geometry, the expansion obtained inside the ejection nozzle allows the first liquid-gas mixture from the distribution chamber to be converted into a second mixture, according to the flow configuration, consisting for instance of a diphasic mist jet having an ejection range and liquid particle size that can be controlled according to the liquid and gas mass flow and to the absolute pressure at the injection inlet.

主权项

1. A device for ejecting an at least diphasic mixture, comprising:
at least one injection inlet for introducing a liquid and a gas; a distribution chamber for producing a first liquid/gas mixture communicating with said injection inlet; an ejection nozzle communicating with said distribution chamber for ejecting the first liquid/gas mixture, said ejection nozzle having a nozzle outlet, and said ejection nozzle extending in a main direction defined by a vector axis and having a geometry formed, over a length thereof, with the nozzle inlet having a first converging access zone with a steep gradient having a steep gradient axial length along said vector axis followed by a second converging zone with a shallow gradient and a second converging zone axial length along the vector axis, said second converging zone leading to a minimum cross-section defining a neck at a given location along the vector axis, said minimum cross-section causing a pressure reduction within said ejection nozzle, allowing the first liquid/gas mixture originating from said distribution chamber to be converted, in a direction of flow, into a second liquid/gas mixture at said nozzle outlet; said outlet being a diverging zone having a diverging zone axial length along the vector axis, the steep gradient axial length being less than the diverging zone axial length, which is less than the second converging zone axial length, said vector being a main axis of said ejection nozzle, said nozzle inlet and said nozzle outlet being symmetric about said main axis of said ejection nozzle; wherein an ejection range of the second liquid/gas mixture and a particle size of the liquid in droplet form is controllable as a function of a mass flow rate of the liquid and the gas and of an absolute pressure at said injection inlet.