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PIV trace particles for wind tunnels and preparation method thereof

A technology for tracking particles and wind tunnels, which is used in measurement devices, instruments, aerodynamic tests, etc., can solve the problems of increasing wind tunnel experiment costs, high polymer particle preparation costs, and wind tunnel pollution, etc., and achieves a good flow field. The effect of followability, low experimental test cost, and good flow field followability

Inactive Publication Date: 2010-06-02
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly the following types of PIV tracer particles commonly used in wind tunnel experiments: the first type is to atomize liquid into droplets as tracer particles, such as atomizing paraffin oil into liquid droplets, although this type of tracer particles in the wind In the flow field of the tunnel, the followability is good, but it will adhere to the wind tunnel wall and the rectification net, causing pollution to the wind tunnel; the second type is to borrow tracer particles commonly used in water tunnels, such as titanium dioxide particles, silicon dioxide particles, Aluminum oxide particles, magnesium oxide particles, glass beads, talcum powder, aluminum powder, and magnesium powder, due to the high density of these tracer particles, have poor followability in the wind tunnel flow field, and because of their high hardness, In wind tunnel experiments, it is easy to wear the model, fan or axial compressor bearings in the wind tunnel, which will affect the normal operation of the wind tunnel; the third type is polymer particles such as polystyrene, and the density of such tracer particles is between 1.1g / cm 3 Left and right, the flow field has good followability, and it is not easy to wear parts such as models, fans or bearings in the wind tunnel. However, the preparation cost of such polymer particles is very high, and in the wind tunnel experiment, the amount of PIV tracer particles This will greatly increase the cost of wind tunnel experiments and affect the application of such tracer particles in wind tunnel experiments

Method used

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  • PIV trace particles for wind tunnels and preparation method thereof
  • PIV trace particles for wind tunnels and preparation method thereof
  • PIV trace particles for wind tunnels and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0032] Example 1: Preparation of PIV tracer particles with an average particle size of 13.4 μm

[0033] Core core: choose corn starch granule material;

[0034] Modifier: select the coupling agent compounded by titanate coupling agent NDZ-401 and silane coupling agent A-151, wherein the compounding ratio is NDZ-401:A-151=2:1.

[0035] making process:

[0036] The first step: through the method of jet milling, under the conditions of the crushing airflow pressure of 0.6MPa and the speed of the classification wheel of 2000r / min, the corn starch granules are ultrafinely pulverized, and the average particle size of the pulverized starch granules is 13.4 μm;

[0037] The second step: drying the cornstarch with an average particle size of 13.4 μm prepared in the first step for 3 hours at 110° C. to obtain dry core particles;

[0038] The third step: the dried core particles and modifier obtained in the second step are placed in a high-speed mixer (select SHR-5A high-speed mixer,...

Embodiment 2

[0042] Example 2: Preparation of PIV tracer particles with an average particle size of 7.6 μm

[0043] Core core: choose rapeseed pollen granular material;

[0044] Modifier: choose aluminate coupling agent DL-2411-A.

[0045] making process:

[0046] The first step: through the method of vibrating mill crushing, after crushing for 3 hours, rapeseed pollen fine particle materials with an average particle size of 7.6 μm are obtained;

[0047] The crushing conditions of the vibration mill are: the vibration frequency is 55 Hz, the amplitude is 5 mm, the grinding medium is zirconia balls of three diameters, and the amount of different grinding media is 8 mm zirconia balls: 5 mm zirconia balls: 2 mm zirconia balls = 5:3 : 2, the crushing time is 30min;

[0048] Dosage: The mass ratio of rapeseed pollen granular material to grinding medium is 1:2;

[0049] In this step, the rapeseed pollen granular material and the grinding medium account for 80% of the cavity volume of the vib...

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Abstract

The invention discloses PIV trace particles for wind tunnels and a preparation method thereof. The PIV trace particles for the wind tunnels are made by using a starch or pollen particle material as cores and coating a layer of 0.5 to 2 weight percent organic thin film on the surface of each core. The particle size of the PIV trace particles for the wind tunnels is 0.5 to 22mum and the density of the PIV trace particles for the wind tunnels is 0.5 to 2.0 g / cm<3>. The preparation method of the PIV trace particles for the wind tunnels comprises: firstly, selecting a light material and subjecting the light material to ultrafine grinding to obtain core particles with a particle size of 0.2 to 20mum; secondly, coating a layer of organic thin film on the surface of each core particle to change the surface of the core particle from a hydrophilic surface to a hydrophobic surface, so that the core particles are prevented from adsorbing vapor and conglobating in the air, the dispersity and flowability of the core particles are improved, and the core particles can uniformly distribute in an air flow field and have a high flow following property. The method has the advantages of simple process, stability and reliability, low cost and the like. The PIV trace particles for the wind tunnels prepared by the method can uniformly disperse in the wind tunnels and have excellent flow following property and excellent and stable performance.

Description

technical field [0001] The present invention relates to a kind of PIV tracer particle, more particularly, refers to a kind of PIV tracer particle that is suitable for wind tunnel experiment, and this PIV tracer particle takes light material particle as core core, and on the surface of core core Coated with organic film. Background technique [0002] Wind tunnel experiment is one of the most basic research methods in aerodynamics research. As an important part of wind tunnel experiment, the testing technology will directly affect the effect of wind tunnel experiment. With the development of computer and image processing technology, wind tunnel testing technology is also developing rapidly. PIV (Particle Image Velocimetry, Particle Image Velocimetry) testing technology is currently widely introduced into wind tunnel flow field measurement. The velocity measurement principle is to indirectly measure the transient velocity distribution in the flow field by measuring the displac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/02
Inventor 蔡楚江沈志刚吴芸麻树林邢玉山
Owner BEIHANG UNIV
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