CN102533109A

CN102533109A - Oil formula of high speed wind tunnel colorful oil flow experiment

Info

Publication number: CN102533109A
Application number: CN2011104155949A
Authority: CN
Inventors: 张军强; 尚金奎; 王世红; 王鹏; 赵民
Original assignee: AVIC Shenyang Aerodynamics Research Institute
Current assignee: AVIC Shenyang Aerodynamics Research Institute
Priority date: 2011-12-14
Filing date: 2011-12-14
Publication date: 2012-07-04
Anticipated expiration: 2031-12-14
Also published as: CN102533109B

Abstract

The invention provides an oil formula of a high speed wind tunnel colorful oil flow experiment. Through a series of wind tunnel experiments, a colorful indicator (fluorescent pigment), a carrier oil (N150 mechanical oil) and a diluent (kerosene) are determined, and mass percentage relations of the three materials are determined; colorful oil flow experiment is finished in a high speed wind tunnel (pressure/transonic velocity) environment so as to obtain a colorful oil flow experiment image with high quality; and the colorful oil flow experiment image is used for analyzing airflow state of the model surface so as to realize high speed wind tunnel multi-color oil flow experiment and express one special flowing phenomenon by using different colors.

Description

The oil plant prescription of the colored oil stream of high-speed wind tunnel test

Technical field

The present invention relates to wind tunnel color oil stream experimental technique, particularly relate to the oil plant prescription of the colored oil stream of high-speed wind tunnel test.

Background technology

In wind1 tunnel trial, oil stream test is the TP that some characteristic of air-flow winding mold type mobile is shown by means of physical means with the form of picture.Through observing oily stream picture; And carry out topological analysis; Can in depth understand the essence and the mechanism of flow phenomenon, confirm position and the isolating mode and the characteristics of position, the position that shock wave and vortex occur and pneumatic separation that air-flow adheres on model, for the pragmatize experimental data provides foundation; Help to find the approach that solves some particular problem, also help to set up, improve and to develop new aerodynamics theoretical.

Attaches the special coating of one deck (oil plant that normally contains trickle trace particle) through being coated with during the test of oil stream at model surface; When drying test; The shearing stress that the model surface air stream on accompany surface forms promotes the oil plant film of model surface and does the viscosity motion, forms oily flow pattern.Through observation analysis, confirm the flow state on the model to oily flow pattern.

The oil flow pattern is actually the oil plant film and under air-flow promotes, does the viscosity motion, and at the mobile trace collection of illustrative plates that model surface forms, the principal character structure is a singular point on the oily flow pattern.So-called singular point, be exactly frictional stress be zero point.Different modes according to friction line is assembled or dispersed at the singular point place is divided into dissimilar singular points.Oil is common in the flow pattern to have saddle point, node and three kinds of singular points of spiral points.

Can see two groups of oil stain lines near the saddle point, one group of oil stain line points to saddle point, and another group oil stain line leaves saddle point, and is asymptotic line and assembling gradually with a line, and the existence of saddle point often shows that pneumatic separation is arranged on the object plane, like Fig. 1.

The node place can see that a lot of bar oil stain lines converge to a bit, if all oil stain lines all deviate from node, is called and adheres to node; If all oil stain lines all point to node, be called the separation node, like Fig. 2.

Near the spiral points oil stain line is rolled onto a bit twist, if all spiral-linees all are to get into spiral points, then for separating spiral points; If all spiral points are all from spiral points, then for adhering to spiral points.The existence of spiral points shows and has the spiral whirlpool on the object plane, like Fig. 3.

Summary of the invention

The technical problem that the present invention will solve provides a kind of colored oil stream of wind-tunnel polychrome test that realizes showing, shows the oil plant prescription of the colored oil stream of the high-speed wind tunnel test of some special flow phenomenon with different color.

The technical scheme that adopts is:

The oil plant prescription of the colored oil stream of high-speed wind tunnel test is made up of colored indicator, carrier oil plant and thinner, and its prescription is directly related with the wind speed of high-speed wind tunnel, and the oil plant prescription that concrete The test wind is corresponding is following by mass percentage:

(1) when 0.3≤M＜0.7

Carrier oil plant 29%

Colored indicator 28%

Thinner 43%

(2) when 0.7≤M＜0.8

Carrier oil plant 64%

Colored indicator 19%

Thinner 17%

(3) when 0.8≤M＜1.2

Carrier oil plant 54%

Colored indicator 32%

Thinner 14%

Above-mentioned carrier oil plant is the N150 machinery oil.

Above-mentioned colored indicator is the red fluorescence pigment FT-714 of China's brightness group production forever; Green fluorescence pigment FT-711; Blue-fluorescence pigment FT-719.

Above-mentioned thinner is a kerosene.

Advantage of the present invention is:

1 can be coated with at the model different sites when carrying out the test of the colored oil stream of high-speed wind tunnel and attaches the oil plant that contains the colored indicator of different colours, is used for flowing of display model surface different sites air-flow.

2 colored indicator can be good at showing oily streak line, need not be used to increase the priming paint of oily stream picture contrast gradient in the model surface spraying;

Can select different oil to banish ratio under the 3 different wind conditions, can obtain best oily streak line image.

Description of drawings

Fig. 1 is the saddle point synoptic diagram.

Fig. 2 a separates the node synoptic diagram.

Fig. 2 b adheres to the node synoptic diagram.

Fig. 3 separates the spiral points synoptic diagram.

The colored oil stream of the high-speed wind tunnel that Fig. 4 is to use blue-fluorescence pigment to carry out test effect picture.

Embodiment

Embodiment one

The oil plant prescription of the colored oil stream of high-speed wind tunnel test:

(1) according to test M=0.5, get the oil plant consumption of estimating in carrier oil plant 29%, colored indicator 28%, thinner 43% and the test of 0.3≤M＜0.7 o'clock, confirm the consumption of N150 machinery oil, high-visibility pigment and kerosene.

(2) high-visibility pigment weighing

Using absorbent cotton to dip in the kerosene that takes a morsel prepares beaker with oil plant and cleans up; Treat after the kerosene volatilization beaker to be placed on the electronic balance (or other weighing utensils); Open electronic balance, measure an amount of high-visibility pigment with spoon and pour beaker into, until reaching needed weight.

(3) N150 machinery oil and kerosene measures

According to the N150 machinery oil consumption of confirming, select appropriate vol to get instrument, measure an amount of N150 machinery oil and inject the oil plant preparation beaker of (2) mentioning.Measuring of kerosene is consistent with the N150 machinery oil.

(4) oil plant stirs

Use stirring rod that high-visibility pigment of measuring and oil plant are stirred, mix until high-visibility pigment and oil plant.

(5) oil plant of preparation need leave standstill for some time, to guarantee the abundant loss of bubble in the oil plant.Suggestion configures oil plant about half hour before making an experiment.

(6) preceding the dipping in absorbent cotton or long stapled cotton of brushing oil plant got proper amount of acetone (absolute ethyl alcohol) with the model surface wiped clean; After treating that residual acetone vapors away fully; The oil plant for preparing and obtain sufficient standing is brushed at model surface equably, then can be carried out the test of the colored oil stream of high-speed wind tunnel.

Embodiment two

Embodiment two and embodiment one are basic identical, are M=0.7 without part, get the carrier oil plant 64% of 0.7≤M＜0.8 o'clock, colored indicator 19%, and thinner 17%, other are identical.

Embodiment three

Embodiment two and embodiment one are basic identical, and difference is M=1.18, get the carrier oil plant 54% when 0.8≤M＜1.2, colored indicator 32%, and thinner 14%, other is identical.

Claims

1. the oil plant prescription of the colored oil stream of high-speed wind tunnel test is characterized in that being made up of colored indicator, carrier oil plant and thinner, and its prescription is directly related with the wind speed of high-speed wind tunnel, and the oil plant prescription that concrete The test wind is corresponding is following by mass percentage:

(1) when 0.3≤M＜0.7;

Carrier oil plant 29%;

Colored indicator 28%;

Thinner 43%;

(2) when 0.7≤M＜0.8;

Carrier oil plant 64%;

Colored indicator 19%;

Thinner 17%;

(3) when 0.8≤M＜1.2;

Carrier oil plant 54%;

Colored indicator 32%;

Thinner 14%.

2. the oil plant prescription of the colored oil stream of high-speed wind tunnel according to claim 1 test is characterized in that described carrier oil plant is the N150 machinery oil.

3. the oil plant prescription of the colored oil stream of high-speed wind tunnel according to claim 1 test is characterized in that described colored indicator is red fluorescence pigment FT-714; Green fluorescence pigment FT-711; Blue-fluorescence pigment FT-719.

4. the oil plant prescription of the colored oil stream of high-speed wind tunnel according to claim 1 test is characterized in that described thinner is a kerosene.