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A method for flow measurement by non-extending miniature acoustic probes

An acoustic detector and flow measurement technology, which is applied in the direction of fluid velocity measurement, fluid velocity measurement using a swirl flowmeter, and measurement devices, can solve problems such as redundant data and large-scale flow measurement technology that cannot meet the requirements, and achieve less resources , to avoid secondary screening, the structure has little effect on the flow

Active Publication Date: 2020-01-03
BEIHANG UNIV
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Problems solved by technology

[0005] Considering that in practical engineering applications, the size of the equipment is an important indicator, and it is required to be installed on the equipment as small as possible. The above-mentioned large-scale flow measurement technology cannot meet the requirements
On the other hand, for aircraft and some industrial rotating machinery, the flow environment is an open environment without solid walls, and the full-field velocity field will have some redundant data for equipment use and operators

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  • A method for flow measurement by non-extending miniature acoustic probes
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  • A method for flow measurement by non-extending miniature acoustic probes

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with accompanying drawings and examples.

[0033] The invention relates to a non-extending and non-synaptic acoustic measurement method for measuring the fluid flow boundary layer, which is a fast display method for flow, and the method has as little influence on the movement of the flow itself as possible. From its own principle, through the direct relationship between sound and vortex velocity, it can display the flow field of the boundary layer of the boundary surface. Taking the short-distance takeoff of an airplane as an example, at this time, the minimum spray volume for takeoff of the airplane has become a core problem to be solved. The aircraft controls this parameter through the rapid observation of the external flow field, and it is necessary to capture the vortex of the external boundary flow field as quickly as possible. At this time, the built-in acoustic detector on the wing can...

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Abstract

The invention discloses a method using a non-extension type miniature sound detectors to perform flow measurement and belongs to the field of hydrodynamics. The method is characterized in that the miniature sound detectors are arranged inside a to-be-measured fan; by one sound detector A, a phase-determined sound signal is transmitted to one flow vortex K of a flow boundary layer and is reflectedto obtain the Doppler frequency shift speed components of the A and the vortex K in the direction i; in the similar way, by another sound detector B, the Doppler frequency shift speed component of thevortex k in the direction j is obtained; the different speed components are overlapped to obtain the speed and direction of the vortex K; the detectors transmit the pulse sound wave signals at constant time intervals to obtain the Doppler frequency shift components of multiple vortexes in corresponding directions; the sound detectors are arranged in a linear or planar vertical manner to measure flow planar speed fields and three-dimensional speed fields inside the flow boundary layer. The method is fast in instantaneous response, small in error, low in resource consumption and worthy of popularization.

Description

technical field [0001] The invention belongs to the field of fluid mechanics, relates to aeroacoustics, in particular to a method for measuring flow through a non-extending miniature acoustic detector. Background technique [0002] Early flow velocity measurement was mainly through the direct effect of pressure, and the velocity was directly obtained by means of the pressure-velocity relationship (such as Bernoulli's principle). For example, the speed measuring device widely used in practice—pitot tube is a simple structure and synaptic flow measurement device. The speed is obtained by the difference between the static pressure outside the bellows and the dynamic pressure inside the bellows. The structure is simple and It has a wide range of applications and is widely used in the aerospace field. However, the measurement result has no direction, and only the data of a single point can be obtained, which cannot meet the requirements for aircraft and industrial rotating machi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P5/24G01P5/01
CPCG01P5/01G01P5/244
Inventor 瑞尼·阿里斯曼王一帆胡天翔刘沛清屈秋林
Owner BEIHANG UNIV
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