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Apparatus and method for measuring the effect of sound waves on a freely propagating flame

A sound wave and flame technology, applied in the field of devices for detecting the influence of sound waves on freely propagating flames, can solve the problems of no related devices and platforms

Active Publication Date: 2019-07-02
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through literature research, we found that there is no work involving the influence of sound waves on free-propagating flames, and there are no related devices and platforms. Therefore, it is urgent to invent a set of experimental devices that can couple sound waves and free-propagating flames to solve the technical problems in this field. Scientific question

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  • Apparatus and method for measuring the effect of sound waves on a freely propagating flame
  • Apparatus and method for measuring the effect of sound waves on a freely propagating flame

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Embodiment Construction

[0020] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but only to illustrate the essence of the technical solutions of the present invention.

[0021] In the following description, for the purposes of explaining the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of these specific details. In other instances, well-known devices, structures and techniques associated with the present application may not have been shown or described in detail in order to avoid unnecessarily...

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Abstract

The invention discloses an apparatus and method for measuring the effect of acoustic waves on freely propagating flames. The apparatus is composed of a constant-volume combustion bomb, a sample introduction system, an ignition system, an optical schlieren system, and an acoustic system. The constant-volume combustion bomb contains premixed combustible gas. The sample introduction system provides the premixed combustible gas for the cavity of the constant-volume combustion bomb. The ignition system has an ignition electrode and is used for ignition of the premixed combustible gas. The acousticsystem provided with an acoustic wave generation device is used for providing acoustic excitation for the cavity of the constant-volume combustion bomb. Two opposite flanges are fixed on the side wallof the cavity of the constant-volume combustion bomb; flanges are installed at the top and the bottom of the cavity; the acoustic wave generation device and the ignition electrode are installed at the two flanges of the side wall of the cavity; and the two flanges of the top and the bottom are provided with transparent view windows as optical paths of the optical schlieren system, so that the optical schlieren system records the flame propagation process under the acoustic wave effect. Therefore, a problem of measuring the effect on the freely propagating flames by acoustic waves is solved.

Description

technical field [0001] The invention relates to the fields of engines and combustion, in particular to a device and method for detecting the influence of sound waves on freely propagating flames. Background technique [0002] In order to meet strict engine pollution emission standards, the engine industry increasingly adopts lean-burn premixed combustion to reduce the emission of NOx and other pollutants. Although lean-burn premixed combustion can effectively improve NOx emissions, it is easily affected by combustion instability, especially thermoacoustic instability. Thermoacoustic instability is a complex coupling effect of sound waves in the engine combustion chamber and flame heat release, which can lead to the generation of pressure waves, which in turn can cause serious consequences such as flame blowout, flashback, and engine damage. In addition, in internal combustion engines, pressure oscillations caused by thermoacoustic coupling are also closely related to combus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/10
CPCG01M15/10
Inventor 李玉阳梅博文王国情
Owner SHANGHAI JIAO TONG UNIV
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