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PIV experimental device for air drag reduction on groove surface

An experimental device and groove technology, which is applied in the direction of measuring device, fluid dynamics test, machine/structural component test, etc., can solve the problems of time-consuming, high cost, and large area occupation, and achieve diverse research, low cost, and The effect of guaranteeing accuracy

Inactive Publication Date: 2019-04-02
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] At present, the research on the drag reduction characteristics of grooves is mainly focused on numerical simulation research, and the experimental research is limited to large-scale wind tunnel experiments, which has the disadvantages of high cost, large area occupation and long time consumption.

Method used

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  • PIV experimental device for air drag reduction on groove surface
  • PIV experimental device for air drag reduction on groove surface
  • PIV experimental device for air drag reduction on groove surface

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Experimental program
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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with structural drawings and embodiments.

[0023] a) In order to ensure the range adjustability of the air volume, the fan (1) with a large air volume is selected, at 1405m 3 It can be adjusted within / h; select the sealing gasket (2) to make the connection no air leakage, and then tighten and fix it with a stainless steel clamp.

[0024] b) In order to enable the PIV system to observe the flow on the surface of the groove, the material of the channel (3) is acrylic plate material with high transparency, and the thickness is 4-8mm.

[0025] c) In order to ensure the stability of the gas flow, a 1m-long deflector (4) is installed on the upstream part of the channel (3); The length is 2m, and the particle generator is installed on the upstream part of the channel (3); the downstream test section of the channel (3) is 2m long, so that the measurement is more accurate.

[0026] d) When measuring the f...

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Abstract

The invention discloses a PIV experimental device for the air drag reduction on a groove surface, and belongs to the field of experimental fluid mechanics research. The experimental device comprises three parts of power apparatus, pressure test apparatus, and a PIV system. The power apparatus is mainly composed of a fan. The pressure test apparatus mainly comprises a test channel, a frequency modulator, an anemometer, and a differential pressure gauge. The PIV system is mainly composed of a CCD camera, a laser, and a computer. The device can measure the pressure drops of different groove surfaces under different flow rates to determine whether to reduce the drag; and at the same time, can realize the requirement of observing the internal flow field characteristics by the PIV system. The PIV experimental device for the air drag reduction on the groove surface can explore the drag reduction mechanism of a non-smooth surface according to its internal flow field characteristics, provides atheoretical guidance for the optimal design of a groove structure, and plays an important role in reducing the costs, increasing the fuel utilization rate, and reducing the energy consumption of an aircraft.

Description

technical field [0001] The invention relates to a Particle Image Velocimetry (PIV) experimental device for air drag reduction on the surface of grooves, in particular to the size of the grooves, the direction of the grooves, the The influence of fluid velocity and other factors on the flow field and the analysis of the flow field structure combined with the boundary layer theory belong to the technical field of measuring the air drag reduction and flow field on the surface of the groove by using an experimental device. Background technique [0002] In recent years, social energy consumption has been rising continuously, which has attracted great attention from all over the world. Energy saving and consumption reduction has become an important research topic at home and abroad. The energy consumption of airplanes, trains, ships and other means of transportation mainly comes from surface resistance, and reducing surface resistance has important guiding significance for reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M10/00
Inventor 刘赵淼田琦逄燕
Owner BEIJING UNIV OF TECH
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