Double-cavity coupling Helmholtz silencer and control method

A muffler and control system technology, which is applied in the direction of sound-emitting devices and instruments, can solve the problem that the noise reduction effect of the resonator is not greatly improved, and achieve the effects of increased transmission loss, improved flame stability, and improved noise reduction effect

Pending Publication Date: 2021-11-02
JIANGSU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This resonator overcomes the problem of narrow operating frequency of a single Helmholtz resonator, but the noise reduction effect of this resonator is not much improved compared with the traditional Helmholtz resonator, so the noise reduction of this resonator The effect needs to be further improved

Method used

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  • Double-cavity coupling Helmholtz silencer and control method
  • Double-cavity coupling Helmholtz silencer and control method
  • Double-cavity coupling Helmholtz silencer and control method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with drawings and embodiments.

[0030] Such as Figure 1-5 As shown, the present invention provides a dual-cavity coupling Helmholtz muffler and a control method, including a main pipe 1, a short neck pipe 2, a resonance chamber 3, a control system, a gear transmission system, and a telescopic extension pipe assembly; the resonance chamber 3 is provided with a baffle plate 4, and the resonant cavity 3 is divided into a first cavity 31 and a second cavity 32, and the neck short tube 2 is provided with two, respectively connecting the first cavity 31 and the second cavity 32 with the main cavity The pipeline 1 is connected, and the seal between the three is good. The telescopic extension tube assembly is arranged in the second cavity 32. The first cavity 31 and the second cavity 32 are two cylinders placed horizontally. The second cavity 32 The volume is greater than the volume of the first cavity 31; ...

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Abstract

The invention discloses a double-cavity coupling Helmholtz silencer and a control method, the double-cavity coupling Helmholtz silencer comprises a main pipeline and a resonant cavity communicated with the main pipeline, a baffle dividing the resonant cavity into a first cavity and a second cavity is arranged in the resonant cavity, and a telescopic extension pipe assembly is arranged on one side of the baffle; and a control system is arranged on the main pipeline, a gear transmission system is arranged on one side of the control system, one end of the gear transmission system is in signal connection with the control system, the other end of the gear transmission system is connected with the telescopic extension pipe assembly, and the system can measure the airflow speed in the main pipeline and convert the airflow speed into corresponding electric signals. The gear transmission system is driven to rotate through corresponding signals, and then the telescopic pipe in the resonant cavity is driven to move. By changing the length of the telescopic pipe in the resonant cavity, the jet track and strength of airflow at the opening of the baffle are changed, the transmission loss is further increased, the silencing effect is improved, the stability of flames in the trapped vortex combustion chamber is improved, and meanwhile the silencing frequency band is widened.

Description

technical field [0001] The invention relates to a common passive resistance muffler, in particular to a double-cavity coupled Helmholtz muffler used in a vortex combustion chamber. Background technique [0002] The trapped vortex combustor has the advantages of simple structure, light weight, high combustion efficiency, low NOx emissions, and low total pressure loss, but the noise in the trapped vortex combustor will reduce the flame stability in it, so a muffler is needed to Reduce noise and improve flame stability, while the Helmholtz muffler has a relatively simple structure and excellent sound absorption performance, and is widely used in aero-engines and marine gas turbines. stability. In order to broaden the noise reduction frequency band of a traditional single Helmholtz muffler, two Helmholtz mufflers need to be used in combination. As a passive type of muffler, the Helmholtz muffler is mainly used for middle and low frequency noise reduction. In order to further op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/16
CPCG10K11/172G10K11/161
Inventor 杨兴林马恒吴维维潘伟宸
Owner JIANGSU UNIV OF SCI & TECH
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