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Aero-acoustic experimental apparatus

An acoustic experiment, aerodynamic device technology, applied in aerodynamic experiments, measurement devices, measurement of ultrasonic/sonic/infrasonic waves, etc., can solve the problem that the measurement accuracy cannot meet the actual needs of simulating large-scale sound fields and flow fields, and improve the measurement Accuracy, large measurement range, uniform mesh effect

Active Publication Date: 2009-11-04
NANJING CHANGRONG ACOUSTIC INC
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AI Technical Summary

Problems solved by technology

However, due to the small size and the removal of boundary conditions and other factors, the measurement accuracy cannot meet the actual needs of simulating large-scale sound and flow fields

Method used

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  • Aero-acoustic experimental apparatus
  • Aero-acoustic experimental apparatus

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Embodiment Construction

[0048] An aeroacoustic device according to the present invention, wherein, the high-pressure static flow acoustic pneumatic device see figure 1 , including a low-pressure air source interface device 3, which contains an electric regulating valve and a pipeline; a high-pressure air source interface device 4, which contains an electric regulating valve and a pipeline. The low-pressure air source interface device 3 and the high-pressure air source interface device 4 are connected and merged, and are connected with the downstream public muffler channel 5 and the high-sound intensity reverberation chamber 6; the high-sound intensity sound emitting device 11 is located outside the high-sound intensity reverberation chamber 6 , consisting of a high-sound intensity generator and an index horn, connected to the high-sound-intensity reverberation chamber 6 with a flange; downstream of the high-sound-intensity reverberation chamber 6 there is a flow equalizer 12, an airflow tapering secti...

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Abstract

The invention disclose an aero-acoustic experimental apparatus, which consists of a high-pressure static air flow acoustic pneumatic device and a low-pressure static air flow acoustic pneumatic device, wherein when the highest flow Mach number reaches between 0.65 and 0.8 M and the working pressure is between 0.005 and 0.75 MPa, the measurement for a sound field and a flow field of air flow in a pipeline is achieved through simulation, and the frequencies and the amplitude values of the flow rate and the sound pressure on the surface of a sound lining material are measured and analyzed; under the condition that the air flow reaches the sound velocity and the working pressure, the measurements for the sound field and the flow field under the action of a loud strong sound source in the pipeline is achieved through simulation, and the acoustic experimental performance of the sound lining material is measured and analyzed; the signal acquisition and the mobile measurement of various detectors are achieved by an experimental control system; and the aero-acoustic experimental apparatus achieves a jet test of air under a static air flow condition and analyzes the flow field distribution and the sound field distribution conditions at various flow rates according to the stated steady flow.

Description

technical field [0001] The invention belongs to the field of acoustic control, in particular to an aeroacoustic experimental device for simulating sound field and flow field conditions under various flow velocity and pressure conditions. Background technique [0002] The acoustic lining structure is used in the anechoic nacelle of the aero-engine, and the acoustic characteristics of the acoustic lining are closely related to the flow field and the sound field of the acoustic lining, including the surface flow velocity and the frequency and amplitude of the sound pressure. Standing wave tubes have been the standard equipment for measuring the structural acoustic performance of acoustic linings for a long period of time, which is carried out in the case of plane acoustic waves and no flow. However, in the actual air duct, the flow field and sound field are completely different, and the acoustic performance will change greatly. In order to simulate the flow conditions, various...

Claims

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Application Information

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IPC IPC(8): G01M9/06G01H17/00
Inventor 闻小明张荣初
Owner NANJING CHANGRONG ACOUSTIC INC
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