Fuel jetting mixing device and low-pressure fuel jetting mixing method in supersonic velocity flow field

Abstract

The invention discloses a fuel jetting mixing device and a low-pressure fuel jetting mixing method. The fuel jetting mixing device in a supersonic velocity flow field comprises a fuel supply system, mini-type tangential spraying holes and a vortex generator. The supersonic velocity is injected into gas-state fuel supplied by the fuel supply system through the mini-type tangential holes, the gas-state fuel flows to be close to the bottom of a wall face boundary layer and driven by upper high-speed airflow of the boundary layer to flow to the vortex generator, and an inverse spiral flow direction vortex pair wrapping the fuel is formed through high-speed airflow and in the disengaging process of the gas-state fuel on the side edge of the vortex generator; the inverse spiral flow direction vortex pair gradually ascends to get away from the wall face to enter the high-speed main flow through a self-induction mechanism of a vortex structure of the inverse spiral flow direction vortex pair; by means of the instable factor of the inverse spiral flow direction vortex pair in the high-speed main flow, the inverse spiral flow direction vortex pair is controlled to be broken in the high-speed main flow, the gas-state fuel wrapped by the inverse spiral flow direction vortex pair is rapidly mixed with the high-speed main flow, and the purpose of jetting mixing is achieved. The jetting power comes from the kinetic energy inherited by the inverse spiral flow direction vortex pair from the high-speed incoming flow while not relaying on high-pressure driving.

Description

technical field [0001] The invention relates to the technical field of fuel injection, in particular to a fuel injection mixing device in a supersonic flow field. In addition, the present invention also relates to a low-pressure fuel injection and mixing method in a supersonic flow field comprising the fuel injection and mixing device in a supersonic flow field. Background technique [0002] A scramjet is a ramjet in which fuel burns in a supersonic airflow, where fuel injection and mixing are one of the key technologies in scramjet design. The penetration height of the jet and its downstream mixing efficiency are important indicators for evaluating the fuel injection scheme, which will directly affect the ignition and combustion efficiency of the engine, and also have a profound impact on the working process and overall performance of the entire engine. Especially in large-sized engine combustion chambers, in order to ensure sufficient contact and mixing of the fuel and th...

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Problems solved by technology

[0004] The invention provides a fuel injection mixing device in a supersonic flow field and a fuel low-pressure injection mixing method to solve the problems of high injection pressure requirements, large energy loss, low penetration depth, and poor mixing effect of the existing fuel injection methods. technical problem

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