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Synchronous detection method for flow field and flame structures

A flame structure and synchronous detection technology, which is applied in phase influence characteristic measurement, fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems that the coupling process of flow and chemical reaction cannot be explained, and the flow field structure and flame structure cannot be obtained at the same time.

Active Publication Date: 2014-11-26
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] Neither the schlieren nor the PLIF can obtain the information of both the flow field structure and the flame structure at the same time, and the results obtained in this way cannot explain the coupling process of flow and chemical reactions in the supersonic combustion field of hydrocarbon fuels.

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  • Synchronous detection method for flow field and flame structures
  • Synchronous detection method for flow field and flame structures

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Embodiment Construction

[0020] The specific implementation of the method for synchronous detection of flow field and flame structure used in the supersonic combustor combustion process of hydrocarbon fuel provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] The optical path for synchronous measurement of the flow field structure and the flame structure of the supersonic combustion field is as follows: figure 1 shown. The 355nm laser light generated by Nd:YAG laser 1-1 tripled in frequency is reflected by mirror 1-25, and pumps dye laser 1-2 to output excitation light with a wavelength of 390.3nm. Among them, Exalite Mix 389 / 398 is selected as the dye in dye laser 1-2. The 390.3nm excitation beam output by the dye laser 1-2 is reflected by the mirror 1-26 to the cylindrical mirror system 1-3 to be shaped into a sheet of light, and then introduced into the supersonic combustion chamber 1-4 through the quartz observation window. Th...

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Abstract

The invention discloses a synchronous detection method for flow field and flame structures of a hydrocarbon fuel during supersonic combustion. The method employs pulsed schlieren for detection of the flow field structure of a supersonic combustion field and CH-PLIF for detection of the flame structure of the supersonic combustion field. Detection focal planes of the pulsed schlieren and CH-PLIF are respectively focused onto a same detection area in a supersonic combustion chamber and the pulsed schlieren and CH-PLIF are synchronously controlled through a pulse synchronous generator so as to realize synchronous detection of the flow field and flame structures during supersonic combustion of the hydrocarbon fuel. The CH-PLIF image of flame structure without background noise of the combustion chamber is superposed with the schlieren image of the flow field structure so as to obtain a synchronous superposition image of the flow field and flame structures of a same instant during supersonic combustion of the hydrocarbon fuel. According to the invention, an experimental detection method for synchronous acquisition of information about flow field and flame structures in a combustion field at a same instant is provided for research on the interaction mechanism of flowing and chemical reactions during supersonic combustion of hydrocarbon fuels.

Description

technical field [0001] The invention relates to a method for synchronous detection of flow field and flame structure, in particular to a method for synchronous detection of flow field and flame structure used in the supersonic combustion process of hydrocarbon fuel. Background technique [0002] The supersonic combustion flow field of hydrocarbon fuel is extremely complex, involving many complex phenomena such as shock wave / expansion wave system, chemical reaction, shear layer, large-scale separation flow and vortex flow, supersonic gas flow pressure propagation, and combustion flame propagation. A process in which flow and chemical reactions are highly coupled. Therefore, in-depth exploration of the supersonic combustion mechanism of hydrocarbon fuels requires a comprehensive study of the flow field, flame structure and interaction process of the supersonic combustion field. [0003] For the supersonic combustion field of hydrocarbon fuel, at present, the flow field struct...

Claims

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Application Information

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IPC IPC(8): G01N21/45G01N21/64
Inventor 袁越明张泰昌宋军浩范学军
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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