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Method for expanding stability limit of supersonic combustion flames

A supersonic combustion and flame stabilization technology, applied in the direction of combustion methods, combustion chambers, combustion equipment, etc., can solve the problems of low practicability and limited flame stabilization range, achieve less oxygen consumption, expand the stability limit, and facilitate operation and control Effect

Active Publication Date: 2014-01-08
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

At present, although flame-stabilizing mechanisms have been widely used, the scope of flame-stabilizing is still limited; in addition, chemical methods are not yet practical because they basically require the introduction of huge energy sources

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  • Method for expanding stability limit of supersonic combustion flames
  • Method for expanding stability limit of supersonic combustion flames

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Embodiment Construction

[0012] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0013] The invention provides a method for simply and effectively expanding the limit of supersonic combustion to stabilize the flame by directly injecting oxygen into the area where the flame resides to form a local oxygen-enriched environment.

[0014] Theoretical basis of the present invention: starting from the molecular collision theory, by adding oxygen into a certain unit space of the fuel to increase the oxygen concentration and increase the collision probability between fuel molecules and oxygen, it is helpful for the chemical reaction to proceed. This method breaks through the general understanding that the local fuel equivalence ratio is very important for flame stabi...

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Abstract

The invention discloses a method for expanding stability limit of supersonic combustion flames. The method comprises the steps of determining a stationing area with the most stabilized flames, a base point with the flames stationed and a recirculation zone structure aiming at a flame stabilizing structure in a scramjet engine, jetting oxygen to the stationing area with the most stabilized flames of the flame stabilizing structure, and meanwhile preventing the original base point with the flames stationed and the original recirculation zone structure from being damaged. The method for expanding the stability limit of the supersonic combustion flames is easy to implement, convenient to operate and control, small in oxygen consumption and capable of being applied to the stabilizing of the flames in the combustion chamber of the scramjet engine.

Description

technical field [0001] The invention relates to a scramjet engine, in particular to a method for expanding the stability limit of a supersonic combustion flame. Background technique [0002] The flame stability in the scramjet is very important for the normal operation of the scramjet. Under the condition of supersonic air flow, the range that can maintain the stable combustion of the flame is very narrow, and as the Mach number increases, the range will become narrower. Moreover, during the acceleration, deceleration, cruising and maneuvering of the scramjet aircraft, the inlet flow conditions of the combustion chamber may change gradually or periodically. These changes will cause changes in the flow field structure, fuel-air mixing and chemical reaction characteristics, which will easily exceed the stable combustion range, cause the engine to stall, and cause serious accidents. [0003] The methods that have been developed to increase the stability of the supersonic comb...

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Application Information

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IPC IPC(8): F23R3/00
Inventor 张泰昌王晶范学军
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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