Method for manufacturing low-temperature high-reynolds-number transonic wind tunnel fluorescent microfilament

Abstract

The present application belongs to the field of aerodynamic cryogenic technology, and particularly relates to a method for manufacturing fluorescent microfilaments for low-temperature high Reynolds number transonic wind tunnels. The method comprises the following steps: soaking silk soaked in warm water in a fluorescent solution with a set proportion; soaking the silk in a color fixing solution for color fixing; rinsing the fluorescent silk after color fixing; soaking the fluorescent silk in a softener and an anti-static liquid; rinsing the fluorescent silk after anti-static treatment; and naturally ventilating and drying the fluorescent silk to obtain fluorescent microfilaments. The fluorescent microfilaments manufactured by the method have high luminous efficiency and strong flow field following property, are suitable for low-temperature high Reynolds number high-speed wind tunnels with wide temperature range and high and low speed environment, and have strong engineering application prospect, thus providing strong support for surface dynamic flow structure display of advanced aircrafts in deep low-temperature environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aerodynamic cryogenic technology, and particularly relates to a method for manufacturing fluorescent microfilaments for a low-temperature high-Reynolds-number transonic wind tunnel. BACKGROUND

[0002] The fluorescent microfilament method is a test method in which extremely small silk threads containing fluorescent substances and subjected to anti-static treatment are pasted and arranged on the surface of a model, and under ultraviolet irradiation, a clear "fluorescent brightening" effect is exhibited to show the flow field on the surface of the model. In the case of minimizing the diameter of the silk threads and the interference of the flow field, the fluorescent microfilaments can truly reflect the complex flow characteristics such as the surface streamline direction, boundary layer separation, vortex interference and the like under different Mach numbers, attitudes and Reynolds numbers of advanced aircraft. At present, the fluorescent microfilament technology is mainly applied to flight tests or large low-speed wind tunnels (Mach number Ma≤0.3), and the fluorescent silk thread materials are mostly nylon or polyester, which are mostly made of polymer fibers and are obviously brittle in a deep cryogenic environment (≤220K), and there are technical difficulties such as embrittlement and fracture, and it is difficult to be applied to low-temperature high-Reynolds-number wind tunnels (110K-323K). At the same time, the diameter of the conventional low-speed wind tunnel silk thread is generally thick (usually greater than 0.05mm), and it is directly applied to low-temperature high-Reynolds-number transonic wind tunnels (0.15≤M≤1.3), and there is a large flow interference. SUMMARY

[0003] The present application aims to overcome the defects of the prior art and provide a method for manufacturing fluorescent microfilaments suitable for low-temperature high-Reynolds-number transonic wind tunnels in a wide temperature range and high-low speed environment.

[0004] In order to achieve the above-mentioned purpose, the present application provides a method for manufacturing fluorescent microfilaments for a low-temperature high-Reynolds-number transonic wind tunnel, which comprises the following steps:

[0005] Step 1) soaking the silk threads soaked in warm water into a fluorescent solution in a set proportion;

[0006] Step 2) soaking the fluorescent silk threads after dyeing into a color fixing solution for color fixing;

[0007] Step 3) rinsing the fluorescent silk threads after color fixing;

[0008] Step 4) soaking the rinsed fluorescent silk threads into a softener;

[0009] Step 5) soaking the softened fluorescent silk threads into an anti-static liquid;

[0010] Step 6) rinsing the fluorescent silk threads after anti-static treatment;

[0011] Step 7) naturally ventilating and drying the rinsed fluorescent silk threads to obtain the fluorescent microfilaments

[0012] As an improvement to the above method, the method further comprises: before step 1), soaking a single strand or multiple strands of silk with a diameter ranging from 0.01 mm to 0.05 mm in water at 50-60° C. for not less than 1 hour.

[0013] As an improvement to the above method, step 1) includes: using a fluorescent color paste with a specific excitation wavelength, fully stirring the fluorescent color paste and distilled water in a mass ratio of 1:20-1:10 to prepare a fluorescent solution; the excitation wavelength is matched with the fluorescent polymer of the fluorescent color paste;

[0014] Soak the silk that has been soaked in warm water in the fluorescent solution for 1-1.5 hours, and keep the fluorescent solution at 50-60℃.

[0015] As an improvement to the above method, the step 2) includes: fully stirring the color fixing agent and distilled water in a mass ratio of 1:20-1:10 to prepare a color fixing solution;

[0016] Soak the dyed fluorescent silk in the fixing solution for no less than 1 hour, and keep the fixing solution at 50-60℃.

[0017] As an improvement to the above method, step 4) includes: soaking the washed fluorescent silk in a softener for not less than 0.5 hours. The softener used in the present invention can be any commonly used softener known in the art.

[0018] As an improvement to the above method, step 5) includes soaking the softened fluorescent silk in an antistatic liquid for a predetermined period of time. The antistatic liquid used in the present invention can be any commonly used antistatic liquid known in the art, such as, but not limited to, commercially available antistatic liquids.

[0019] As an improvement to the above method, step 7) includes:

[0020] Fix the front and back ends of the rinsed fluorescent silk on the support rods at both ends of the micro-puller, straighten and tighten the fluorescent silk by adjusting the distance between the support rods at both ends of the micro-puller, and dry it with natural ventilation to avoid high temperature or direct sunlight.

[0021] As an improvement to the above method, pure water is used for rinsing in both step 3) and step 6).

[0022] On the other hand, the present invention provides a fluorescent microwire for use in a low-temperature and high-Reynolds number transonic wind tunnel. The fluorescent microwire is prepared according to the above method.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] 1. The low-temperature high Reynolds number transonic wind tunnel fluorescent microfilament provided by the application has a diameter of 0.01mm-0.05mm, high luminous efficiency and strong flow field following property, and will not be brittle or broken even in an extremely low-temperature environment (110K) at a temperature of less than 220K, is suitable for a wide-temperature-range high-low-speed environment of less than 220K in a low-temperature high Reynolds number high-speed wind tunnel, and has strong engineering application prospect;

[0025] 2. The fluorescent solution formula and deep low-temperature microfilament manufacturing process provided by the application successfully solve the technical problems of color dropping, brittleness, breaking and poor adhesion of conventional filaments in a deep low-temperature environment, and provide strong support for surface dynamic flow structure display of advanced aircraft in a deep low-temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a low-temperature high Reynolds number transonic wind tunnel fluorescent microfilament manufacturing method flow chart of the application.

[0027] Fig. 2 is an original image and a flow field diagram when T=280K, Ma=0.15 and the atmospheric pressure is 1.0atm, wherein Fig. 2(a) is an original image corresponding to an attack angle AoA=+4°, Fig. 2(b) is a flow field diagram corresponding to the attack angle AoA=+4°, Fig. 2(c) is an original image corresponding to AoA=0, Fig. 2(d) is a flow field diagram corresponding to AoA=0, Fig. 2(e) is an original image corresponding to AoA=-4°, and Fig. 2(f) is a flow field diagram corresponding to AoA=-4°;

[0028] Fig. 3 is an original image and a flow field diagram when T=280K, Ma=0.3 and the atmospheric pressure is 1.0atm, wherein Fig. 3(a) is an original image corresponding to an attack angle AoA=+4°, Fig. 3(b) is a flow field diagram corresponding to the attack angle AoA=+4°, Fig. 3(c) is an original image corresponding to AoA=0, Fig. 3(d) is a flow field diagram corresponding to the attack angle AoA=+4°, Fig. 3(e) is an original image corresponding to AoA=-4°, and Fig. 3(f) is a flow field diagram corresponding to AoA=-4°;

[0029] Fig. 4 is an original image and a flow field diagram when T=190K, Ma=0.15 and the atmospheric pressure is 1.0atm, wherein Fig. 4(a) is an original image corresponding to an attack angle AoA=+4°, Fig. 4(b) is a flow field diagram corresponding to the attack angle AoA=+4°, Fig. 4(c) is an original image corresponding to AoA=0, Fig. 4(d) is a flow field diagram corresponding to AoA=0, Fig. 4(e) is an original image corresponding to AoA=-4°, and Fig. 4(f) is a flow field diagram corresponding to AoA=-4°;

[0030] Figure 5 is the original image and flow field at T = 190 K, Ma = 0.3, 1.0 atm, wherein Figure 5(a) is the original image corresponding to the angle of attack AoA = +4°, Figure 5(b) is the flow field corresponding to the angle of attack AoA = +4°, Figure 5(c) is the original image corresponding to AoA = 0, Figure 5(d) is the flow field corresponding to AoA = 0, Figure 5(e) is the original image corresponding to AoA = -4°, and Figure 5(f) is the flow field corresponding to AoA = -4°;

[0031] Figure 6 is the original image and flow field at T = 110 K, Ma = 0.15, 1.0 atm, wherein Figure 6(a) is the original image corresponding to the angle of attack AoA = +4°, Figure 6(b) is the flow field corresponding to the angle of attack AoA = +4°, Figure 6(c) is the original image corresponding to AoA = 0, Figure 6(d) is the flow field corresponding to AoA = 0, Figure 6(e) is the original image corresponding to AoA = -4°, and Figure 6(f) is the flow field corresponding to AoA = -4°;

[0032] Figure 7 is the original image and flow field at T = 110, Ma = 0.3, 1.0 atm, wherein Figure 7(a) is the original image corresponding to the angle of attack AoA = +4°, Figure 7(b) is the flow field corresponding thereto, Figure 7(c) is the original image corresponding to AoA = 0, Figure 7(d) is the flow field corresponding thereto, Figure 7(e) is the original image corresponding to AoA = -4°, and Figure 7(f) is the flow field corresponding thereto;

[0033] Figure 8 is the angle of attack influence at Ma = 0.3, T0= 280 K, wherein Figure 8(a) is the original image corresponding to the angle of attack AoA = +4°, Figure 8(b) is the flow field corresponding thereto, Figure 8(c) is the original image corresponding to AoA = 0, Figure 8(d) is the flow field corresponding thereto, Figure 8(e) is the original image corresponding to AoA = -4°, and Figure 8(f) is the flow field corresponding thereto;

[0034] Figure 9 is the angle of attack influence at Ma = 0.3, T0= 190 K, wherein Figure 9(a) is the original image corresponding to the angle of attack AoA = +4°, Figure 9(b) is the flow field corresponding thereto, Figure 9(c) is the original image corresponding to AoA = 0, Figure 9(d) is the flow field corresponding thereto, Figure 9(e) is the original image corresponding to AoA = -4°, and Figure 9(f) is the flow field corresponding thereto;

[0035] Figure 10 is an experiment on the influence of compressibility, where Figure 10(a) is the original image corresponding to Ma=0.3, AoA=0, T=110K, Figure 10(b) is the corresponding flow field map, Figure 10(c) is the original image corresponding to Ma=0.82, AoA=0, T=110K, Figure 10(d) is the corresponding flow field map, Figure 10(e) is the original image corresponding to Ma=0.79, AoA=0, T=110K, Figure 10(f) is the corresponding flow field map, Figure 10(g) is the original image corresponding to Ma=0.76, AoA=0, T=110K, and Figure 10(h) is the corresponding flow field map;

[0036] Figure 11 is a Reynolds number effect experiment, where Figure 11(a) is the original image corresponding to AoA=+4, Ma=0.3, T=280K, Figure 11(b) is the corresponding flow field diagram, Figure 11(c) is the original image corresponding to AoA=+4, Ma=0.3, T=190K, Figure 11(d) is the corresponding flow field diagram, Figure 11(e) is the original image corresponding to AoA=+4, Ma=0.3, T=110K, and Figure 11(f) is the corresponding flow field diagram. DETAILED DESCRIPTION

[0037] Unless otherwise specified, the experimental methods used in the following examples are conventional methods; the materials, reagents, etc. used in the following examples are all commercially available unless otherwise specified.

[0038] The present invention provides a method for fabricating fluorescent microwires in a low-temperature, high-Reynolds-number transonic wind tunnel. The method mainly comprises the following steps:

[0039] like Figure 1 As shown, the present invention preferably provides a low-temperature fluorescent microfilament production method comprising the following steps: a: selecting continuous long-fiber silk made from silk fluid secreted by mature silkworms during cocooning as raw material for preparing fluorescent silk threads;

[0040] Depending on the specific test scenario, select single or multiple strands of silk (typically 0.01mm to 0.05mm in diameter). b: Soak the silk neatly in 50-60°C warm water for approximately 1 hour to enhance the fluorescent solution's dyeing effect. c: Weigh the liquid fluorescent color paste / solid fluorescent agent and distilled water in a specific ratio and stir thoroughly to prepare the fluorescent solution.

[0041] d. Soak the soaked silk in the fluorescent solution. Place the container containing the silk in a constant temperature heater at 50-60°C for 1-1.5 hours. If the temperature is too low, the silk dyeing rate will be low. If the temperature is too high, the activity of the fluorescent substance will be reduced, and the fluorescent color will be lighter.

[0042] e: Weigh the color fixing agent and distilled water in a certain proportion and stir thoroughly to prepare the color fixing agent solution.

[0043] f: After soaking in the fluorescent solution, put the silk into the color fixing solution container and soak for color fixing. The container is placed in a constant temperature heater at 50-60℃ for 1h.

[0044]

[0045] g: After color fixing is completed, use a glass rod to fish out the fluorescent silk, and rinse repeatedly with pure water to wash off the surface floating color, preventing the fluorescent material from adhering to the model surface and affecting flow observation.

[0046] h: Put the rinsed fluorescent silk into a beaker containing a softener solution and soak for about 0.5h to improve the softening performance of the fluorescent silk.

[0047] i: Use a glass rod to fish out the softened fluorescent silk and put it into a beaker containing an anti-static liquid and soak for about 0.5h.

[0048] j: Use a glass rod to fish out the fluorescent silk and rinse repeatedly with pure water to ensure that the fluorescent silk is free of impurities.

[0049] k: Fix the rinsed fluorescent silk to the two end supports of the microtensiometer, adjust the distance between the two end supports to stretch the fluorescent silk taut, and air dry naturally to avoid high temperature or direct sunlight.

[0050] The technical solutions of the present application will be described in detail below in conjunction with the drawings and examples.

[0051] Example 1

[0052] The embodiment of the present application provides a low-temperature high-Reynolds-number transonic wind tunnel fluorescent micro-silk manufacturing method, comprising the following steps:

[0053] a: Select single silk with a diameter of about 0.01mm as the raw material for preparing fluorescent silk.

[0054] b: Put the single silk into 50℃ warm water and soak for 1h.

[0055] c: Select green fluorescent color paste with an excitation wavelength of 365nm, and fully stir according to the mass ratio of fluorescent color paste to distilled water 1:10 to prepare the fluorescent solution. The excitation wavelength here needs to match the fluorescent high polymer of the fluorescent color paste. If green fluorescent color paste is selected, the wavelength is 365nm.

[0056] d: Put the silk soaked in warm water into a glass beaker containing the prepared fluorescent solution and soak for dyeing. The glass beaker is placed in a constant temperature heater at 50℃ for 1.5h.

[0057] e: Fully stir to make the color fixing solution according to the ratio of color fixing agent to distilled water 1:10. ​

[0058] f: After soaking in the fluorescent solution, the silk is soaked in the glass beaker containing the prepared fixing solution. The glass beaker is placed in a constant temperature heater at 50°C for 1 h.

[0059] g: After the fixing is completed, the fluorescent silk is fished out with a glass rod and repeatedly washed with pure water.

[0060] h: The washed fluorescent silk is placed in a beaker containing a softener and soaked for about 0.5 h to improve the softness of the fluorescent silk.

[0061] i: The softened fluorescent silk is fished out with a glass rod and placed in a beaker containing an anti-static liquid and soaked for 0.5 h.

[0062] j: The fluorescent silk is fished out with a glass rod and repeatedly washed with pure water.

[0063] k: The washed fluorescent silk is fixed at the ends of the two supporting rods of the microtensiometer, and the distance between the two ends of the microtensiometer is adjusted to stretch the fluorescent silk straight.

[0064] The stretched fluorescent silk is naturally ventilated and dried to avoid high temperature or direct sunlight.

[0065] Example 2

[0066] The embodiment of the present application provides a low-temperature high Reynolds number transonic wind tunnel fluorescent micro-silk manufacturing method, comprising the following steps:

[0067] a: Selecting single silk with a diameter of about 0.05 mm as the raw material for preparing fluorescent silk.

[0068] b: The single silk is evenly soaked in warm water at 60°C for 1 h.

[0069] c: A green fluorescent color paste with an excitation wavelength of 365 nm is selected, and a fluorescent solution is prepared by fully stirring the fluorescent color paste and distilled water in a ratio of 1:20.

[0070] d: The silk soaked in the warm water is placed in a glass beaker containing the prepared fluorescent solution and soaked for dyeing. The glass beaker is placed in a constant temperature heater at 60°C for 1.5 h.

[0071] e: A fixing solution is prepared by fully stirring the fixing agent and distilled water in a ratio of 1:20.

[0072] f: The silk soaked in the fluorescent solution is soaked in the glass beaker containing the prepared fixing solution. The glass beaker is placed in a constant temperature heater at 60°C for 1 h.

[0073] g: After the fixing is completed, the fluorescent silk is fished out with a glass rod and repeatedly washed with pure water.

[0074] h: Put the rinsed fluorescent silk into a beaker containing softener and soak for about 0.6h to improve the softening performance of the fluorescent silk.

[0075] i: Use a glass rod to fish out the softened fluorescent silk and put it into a beaker containing anti-static liquid and soak for 0.6h.

[0076] j: Use a glass rod to fish out the fluorescent silk and rinse repeatedly with pure water.

[0077] k: Fix the rinsed fluorescent silk thread at both ends of the microtensiometer support rod, adjust the distance between the two ends of the microtensiometer support rod to stretch the fluorescent silk taut, and dry naturally in the air to avoid high temperature or direct sunlight.

[0078] Example 3

[0079] Example 3 of the present application provides a low-temperature high Reynolds number transonic wind tunnel fluorescent microsilk, which is prepared based on the method of Example 1 or Example 2.

[0080] Experimental verification:

[0081] Put the prepared fluorescent silk microsilk into liquid nitrogen, turn on the 365nm ultraviolet light source, and take pictures of the luminescence performance through a camera equipped with a 500nm high-pass filter. After digital processing of the flow display, the fluorescence effect and low-temperature performance are detected.

[0082] The specific experimental data are as follows: four parameters are involved, including temperature T (K), Mach number (Ma), attack angle AoA (°), and atmospheric pressure (atm).

[0083] (1) T = 280K, Ma = 0.15, 1.0atm

[0084] Attack angle AoA = +4°, corresponding to the original image and flow field diagram as shown in Fig. 2(a), Fig. 2(b);

[0085] AoA = 0, corresponding to the original image and flow field diagram as shown in Fig. 2(c), Fig. 2(d);

[0086] AoA = -4°, corresponding to the original image and flow field diagram as shown in Fig. 2(e), Fig. 2(f);

[0087] (2) T = 280K, Ma = 0.3, 1.0atm

[0088] Attack angle AoA = +4°, corresponding to the original image and flow field diagram as shown in Fig. 3(a), Fig. 3(b);

[0089] AoA = 0, corresponding to the original image and flow field diagram as shown in Fig. 3(c), Fig. 3(d);

[0090] AoA = -4°, the corresponding raw images and flow field maps are shown in Figs. 3(e), 3(f);

[0091] (3) T = 190 K, Ma = 0.15, 1.0 atm

[0092] Angle of attack AoA = +4°, the corresponding raw images and flow field maps are shown in Figs. 4(a), 4(b);

[0093] AoA = 0, the corresponding raw images and flow field maps are shown in Figs. 4(c), 4(d);

[0094] AoA = -4°, the corresponding raw images and flow field maps are shown in Figs. 4(e), 4(f);

[0095] (4) T = 190 K, Ma = 0.3, 1.0 atm

[0096] Angle of attack AoA = +4°, the corresponding raw images and flow field maps are shown in Figs. 5(a), 5(b);

[0097] AoA = 0, the corresponding raw images and flow field maps are shown in Figs. 5(c), 5(d);

[0098] AoA = -4°, the corresponding raw images and flow field maps are shown in Figs. 5(e), 5(f);

[0099] (5) T = 110 K, Ma = 0.15, 1.0 atm

[0100] Angle of attack AoA = +4°, the corresponding raw images and flow field maps are shown in Figs. 6(a), 6(b);

[0101] AoA = 0, the corresponding raw images and flow field maps are shown in Figs. 6(c), 6(d);

[0102] AoA = -4°, the corresponding raw images and flow field maps are shown in Figs. 6(e), 6(f);

[0103] (6) T = 110 K, Ma = 0.3, 1.0 atm

[0104] Angle of attack AoA = +4°, the corresponding raw images and flow field maps are shown in Figs. 7(a), 7(b);

[0105] AoA = 0, the corresponding raw images and flow field maps are shown in Figs. 7(c), 7(d);

[0106] AoA = -4°, the corresponding raw images and flow field maps are shown in Figs. 7(e), 7(f);

[0107] (7) Angle of attack under the condition of Ma = 0.3, T0= 280 K:

[0108] Angle of attack AoA = +4°, the corresponding original image and flow field map as shown in Figure 8 (a), Figure 8 (b) ;

[0109] AoA = 0, the corresponding original image and flow field map as shown in Figure 8 (c), Figure 8 (d) ;

[0110] AoA = -4°, the corresponding original image and flow field map as shown in Figure 8 (e), Figure 8 (f) ;

[0111] (8) Angle of attack influence under the condition of Ma = 0.3, T0 = 190K:

[0112] Angle of attack AoA = +4°, the corresponding original image and flow field map as shown in Figure 9 (a), Figure 9 (b) ;

[0113] AoA = 0, the corresponding original image and flow field map as shown in Figure 9 (c), Figure 9 (d) ;

[0114] AoA = -4°, the corresponding original image and flow field map as shown in Figure 9 (e), Figure 9 (f) ;

[0115] (9) Compressibility effect:

[0116] Ma = 0.3, AoA = 0, T = 110K, the corresponding original image and flow field map as shown in Figure 10 (a), Figure 10 (b) ;

[0117] Ma = 0.82, AoA = 0, T = 110K, the corresponding original image and flow field map as shown in Figure 10 (c), Figure 10 (d) ;

[0118] Ma = 0.79, AoA = 0, T = 110K, the corresponding original image and flow field map as shown in Figure 10 (e), Figure 10 (f) ;

[0119] Ma = 0.76, AoA = 0, T = 110K, the corresponding original image and flow field map as shown in Figure 10 (g), Figure 10 (h) ;

[0120] (10) Reynolds number effect:

[0121] AoA = +4, Ma = 0.3, T = 280K, the corresponding original image and flow field map as shown in Figure 11 (a), Figure 11 (b) ;

[0122] AoA = +4, Ma = 0.3, T = 190K, the corresponding original image and flow field map as shown in Figure 11 (c), Figure 11 (d) ;

[0123] AoA = +4, Ma = 0.3, T = 110K, the corresponding original image and flow field map as shown in Figure 11 (e), Figure 11 (f) ;

[0124] ​It can be seen that the fluorescent microfilament has good light emitting efficiency at low temperature, and the fluorescent microfilament can be clearly observed;

[0125] The diameter of the fluorescent filament is less than 0.05 mm, and the flow field has good following property in a low temperature environment;

[0126] The excitation spectrum of the fluorescent agent is between 365 nm and 465 nm, and the power is greater than 5 W.

[0127] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application do not deviate from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. Application of a fluorescent microwire in a low-temperature, high-Reynolds-number transonic wind tunnel test, wherein the method for making the fluorescent microwire comprises: Step 1) soaking the silk soaked in warm water in a fluorescent solution of a set proportion; Step 2) placing the dyed fluorescent silk into a color fixing solution for color fixing; Step 3) rinsing the fluorescent silk after soaking and fixing; Step 4) Soak the rinsed fluorescent silk in softener; Step 5) Soaking the softened fluorescent silk in antistatic liquid; Step 6) rinsing the fluorescent silk after antistatic treatment; Step 7) The washed fluorescent silk is naturally ventilated and air-dried to obtain fluorescent microfilaments.

2. The use of the fluorescent microwire according to claim 1 in a low-temperature and high-Reynolds number transonic wind tunnel test, characterized in that: The method further comprises: before step 1), soaking a single strand or multiple strands of silk with a diameter in the range of 0.01 mm to 0.05 mm in water at 50-60° C. for not less than 1 hour.

3. The use of the fluorescent microwire according to claim 1 in low temperature and high Reynolds number transonic wind tunnel testing, characterized in that: The step 1) comprises: using a fluorescent color paste with a specific excitation wavelength, fully stirring the fluorescent color paste and distilled water in a mass ratio of 1:20-1:10 to prepare a fluorescent solution; the excitation wavelength is matched with the fluorescent polymer of the fluorescent color paste; Soak the silk that has been soaked in warm water in the fluorescent solution for 1-1.5 hours, and keep the fluorescent solution at 50-60℃.

4. The use of the fluorescent microwire according to claim 1 in low temperature and high Reynolds number transonic wind tunnel testing, characterized in that: The step 2) comprises: fully stirring the color fixing agent and distilled water in a mass ratio of 1:20-1:10 to prepare a color fixing solution; Soak the dyed fluorescent silk in the fixing solution for no less than 1 hour, and keep the fixing solution at 50-60℃.

5. The use of the fluorescent microwire according to claim 1 in low temperature and high Reynolds number transonic wind tunnel testing, characterized in that: The step 4) comprises: soaking the rinsed fluorescent silk in a softener for no less than 0.5 hours.

6. The use of the fluorescent microwire according to claim 1 in low temperature and high Reynolds number transonic wind tunnel testing, characterized in that: The step 5) includes: soaking the softened fluorescent silk in an antistatic liquid for no less than 0.5 hours.

7. The use of the fluorescent microwire according to claim 1 in a low-temperature and high-Reynolds number transonic wind tunnel test, characterized in that: The step 7) comprises: Fix the front and back ends of the rinsed fluorescent silk on the support rods at both ends of the micro-puller, straighten and tighten the fluorescent silk by adjusting the distance between the support rods at both ends of the micro-puller, and dry it with natural ventilation to avoid high temperature or direct sunlight.

8. The use of the fluorescent microwire according to claim 1 in a low-temperature and high-Reynolds number transonic wind tunnel test, characterized in that: Purified water is used for rinsing in both step 3) and step 6).

Images