Device for simultaneously measuring cloud and mist parameters of icing wind tunnel

Abstract

The utility model provides a device for simultaneously measuring cloud and mist parameters of an icing wind tunnel, and the device enables an auxiliary transition disc to be installed and fixed on a test section tunnel body through a corner mechanism, the corner mechanism drives the auxiliary transition disc to rotate, a PDA is disposed at the outer side of the tunnel body, and the middle of the auxiliary transition disc of the device is provided with an installation interface for installing an LWC hot line measuring instrument transition clamp. An LWC hot wire measuring instrument is fixedly installed on the device through a transition clamp and is located in a wind tunnel test area for LWC measurement, two symmetrical position-adjustable light holes are formed in the device, an emitter and a receiver form a certain included angle and are aligned with the two holes of the device, laser of the emitter irradiates into a tunnel body from one hole, and laser of the receiver irradiates into the tunnel body from the other hole. After being reflected and refracted by water drops, the water drops penetrate out of the hole body from the other hole and enter a receiver, so that MVD measurement of the cloud particles is carried out.

Description

Technical Field

[0001] This application belongs to the field of aircraft anti-icing and de-icing test technology, specifically relating to a device for simultaneously measuring cloud and fog parameters in an icing wind tunnel. Background Technology

[0002] Icing wind tunnels are important testing and verification platforms for aircraft avionics. They simulate in-flight icing environments to verify the icing and de-icing characteristics of aircraft and their components under different simulated conditions. During icing wind tunnel testing, it is generally necessary to measure cloud and fog parameters in the test section, including cloud volume displacement (MVD) and light-weighted cloud cover (LWC). MVD can be measured using a PDA, and LWC can be measured using a hot-wire LWC meter. However, when using a PDA, the laser energy is lost due to the light passing through the glass window. Utility Model Content

[0003] The purpose of this application is to simultaneously measure cloud and fog parameters in the test section and solve the problem of laser capability loss during PDA measurement. Therefore, a device is needed to simultaneously measure cloud and fog parameters in an icing wind tunnel.

[0004] This application provides a device for simultaneously measuring cloud and fog parameters in an icing wind tunnel. The device includes a laser emitter, a laser receiver, a wind tunnel test section, cloud and fog particles, an LWC hot wire measuring instrument probe, an aperture adjustment device, an auxiliary transition plate, a cornering mechanism, a PDA controller and processor, a PDA bracket, an LWC measuring instrument transition device, an aperture, and an LWC hot wire measuring instrument controller.

[0005] The laser emitter 1 and laser receiver 2 are fixed on the PDA bracket 10 and connected to the PDA controller and processor 9 to form a complete PDA.

[0006] The auxiliary transition plate 7 is fixed on the corner mechanism 8 installed on the tunnel body 3 of the wind tunnel test section;

[0007] The LWC hot wire measuring instrument probe 5 is fixed on the auxiliary transition plate 7 through the LWC measuring instrument transition device 11 and is located inside the wind tunnel test section 3;

[0008] The laser emitter 1 and the laser receiver 2 are facing the light aperture 12. The laser from the laser emitter 1 passes through the light aperture 12 and irradiates the cloud particles 4 inside the wind tunnel test section 3. After reflection and refraction, the laser enters the laser receiver 2 through the light aperture 12.

[0009] Preferably, the auxiliary transition disk 7 is equipped with two light holes 12, and the position is adjusted by the light hole adjustment device 6.

[0010] Preferably, the LWC hot wire measuring instrument probe 5 and the LWC hot wire measuring instrument controller 13 are combined to form an LWC hot wire measuring instrument.

[0011] Preferably, the aperture 12 forms a certain angle with the surface of the auxiliary transition disk 7, which is half of the maximum measurement angle of the PDA.

[0012] Preferably, both the auxiliary transition plate 7 and the LWC hot wire measuring instrument probe 5 can be rotated to a preset angle for installation.

[0013] Preferably, the preset angle is 90°.

[0014] This application has the following technical effects:

[0015] This device is reasonably configured and easy to operate. The two cloud and fog parameter measurement devices can work simultaneously to measure the MVD and LWC parameters of clouds and fog respectively. It can also reduce the energy loss of the laser due to passing through the glass, effectively realize the measurement of wind tunnel cloud and fog parameters, and the results are valid and reliable. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the device.

[0017] In the diagram, 1-laser emitter, 2-laser receiver, 3-wind tunnel test section, 4-cloud particles, 5-LWC hot wire measuring instrument probe, 6-aperture adjustment device, 7-auxiliary transition plate, 8-turning mechanism, 9-PDA control and processor, 10-PDA bracket, 11-LWC measuring instrument transition device, 12-aperture, 13-LWC hot wire measuring instrument controller. Detailed Implementation

[0018] Please see Figure 1 This application provides a device for simultaneously measuring cloud and fog parameters in an icing wind tunnel. The experimental device includes a laser emitter, a laser receiver, a wind tunnel test section, cloud and fog particles, an LWC hot wire measuring instrument probe, an aperture adjustment device, an auxiliary transition plate, a cornering mechanism, a PDA controller and processor, a PDA bracket, an LWC measuring instrument transition device, an aperture, and an LWC hot wire measuring instrument controller.

[0019] The laser emitter 1 and the laser receiver 2 are fixed on the PDA bracket 10 and connected to the PDA controller and processor 9 to form a complete PDA.

[0020] The auxiliary transition plate 7 is fixed to the corner mechanism 8 installed on the tunnel body 3 of the wind tunnel test section;

[0021] The auxiliary transition plate 7 is equipped with two light holes 12, and their positions are adjusted by the light hole adjustment device 6.

[0022] The LWC hot wire measuring instrument probe 5 is fixed on the auxiliary transition plate 7 through the LWC measuring instrument transition device 11 and is located inside the wind tunnel test section 3;

[0023] The LWC hot wire measuring instrument probe 5 and the LWC hot wire measuring instrument controller 13 are connected and combined to form the LWC hot wire measuring instrument.

[0024] Laser emitter 1 and laser receiver 2 face each other directly. The laser from laser emitter 1 passes through the light hole 12 and irradiates the cloud particles 4 inside the wind tunnel test section 3. After reflection and refraction, the laser enters the laser receiver 2 through the light hole 12.

[0025] The aperture 12 forms a certain angle with the surface of the auxiliary transition disk 7, which is half of the maximum measurement angle of the PDA;

[0026] Both the auxiliary transition plate 7 and the LWC hot wire measuring instrument probe 5 can be rotated 90° for installation.

[0027] How to use this device:

[0028] Determine the focal length and angle of the PDA transmitter and receiver, calculate and adjust the position of the aperture adjustment device, calculate the distance between the laser transmitter and receiver and the wind tunnel wall, move the PDA bracket, connect and start the PDA and LWC measuring instrument, start the wind tunnel equipment, set the equipment parameters and begin spraying, and record parameters such as wind tunnel wind speed, spray water pressure, spray air pressure, and static pressure. Fine-tune the PDA receiver so that the particle sampling rate displayed by the equipment software is above 500Hz. Stop sampling at 10000 samplings and obtain the collected MVD results. Simultaneously record the LWC results measured by the LWC measuring instrument.

[0029] In other embodiments of this application, during a cloud and fog parameter test, a PDA and an LWC hot-wire measuring instrument are used together to measure the cloud and fog parameters of the icing wind tunnel. Combined with... Figure 1 As shown, the test apparatus should be configured as follows:

[0030] The laser emitter and laser receiver are fixed on the PDA bracket 10 and connected to the PDA controller and processor 9 to form a complete PDA; the auxiliary transition plate 7 is fixed on the corner mechanism 8 installed in the wind tunnel test section 3; the auxiliary transition plate 7 is equipped with two light holes 12, and its position is adjusted by the light hole adjustment device 6; the LWC hot wire measuring instrument probe 5 is fixed on the auxiliary transition plate 7 through the LWC measuring instrument transition device 11 and is located inside the wind tunnel test section 3; the LWC hot wire measuring instrument probe 5 is connected and combined with the LWC hot wire measuring instrument controller 13 to form the LWC hot wire measuring instrument; the laser emitter 1 and the laser receiver 2 face the light holes 12, and the laser from the laser emitter 1 passes through the light holes 12 and irradiates the cloud particles 4 inside the wind tunnel test section 3, and after reflection and refraction, it enters the laser receiver 2 through the light holes 12. The aperture 12 forms a certain angle with the surface of the auxiliary transition plate 7, which is half of the maximum measurement angle of the PDA; both the auxiliary transition plate 7 and the LWC hot wire measuring instrument probe 5 can be rotated 90° for installation.

[0031] The PDA was selected with a transmitter and receiver both having a focal length of 500mm. The position of the aperture adjustment device was adjusted so that the distance between the two apertures was 175.4mm and the included angle between them was 34°. The PDA bracket was moved so that the laser transmitter and receiver were approximately 190mm from the wind tunnel wall. The PDA and LWC measuring instrument were connected and started. The wind tunnel equipment was started, the parameters were set, and spraying began. The wind speed in the test section was 100m / s, the spray water pressure was 0.15MPa, the spray air pressure was 0.2MPa, and the static pressure in the test area was 96575Pa. The PDA receiver was fine-tuned so that the particle sampling rate displayed by the equipment software was above 500Hz. After debugging, the sampling rate reached above 1000, and sampling was stopped at 10000. The calculated MVD was 22.3µm. The LWC measured by the LWC measuring instrument was 0.35g / m³.

[0032] The device is used as follows: Determine the focal length and angle of the PDA transmitter and receiver; calculate and adjust the position of the aperture adjustment device; calculate the distance between the laser transmitter and receiver and the wind tunnel wall; move the PDA bracket; connect and start the PDA and LWC measuring instrument; start the wind tunnel equipment, set the equipment parameters, and begin spraying; record parameters such as wind tunnel wind speed, spray water pressure, spray air pressure, and static pressure. Fine-tune the PDA receiver so that the particle sampling rate displayed by the equipment software is above 500Hz. Stop sampling at 10000 samples and obtain the collected MVD results. Simultaneously record the LWC results measured by the LWC measuring instrument.

[0033] This application provides a device for simultaneously measuring cloud and fog parameters in an icing wind tunnel. The device uses a rotating mechanism to mount an auxiliary transition plate onto the test section of the tunnel. The rotating mechanism drives the auxiliary transition plate to rotate, and a PDA is placed on the outside of the tunnel. The auxiliary transition plate has a mounting interface in the middle for mounting a transition clamp for an LWC hot-wire measuring instrument. The LWC hot-wire measuring instrument is mounted and fixed to the device via the transition clamp and performs LWC measurements within the wind tunnel test area. The device has two symmetrical, adjustable optical apertures. The transmitter and receiver are aligned at a certain angle with the two apertures. The laser from the transmitter enters the tunnel through one aperture, and after reflection and refraction by water droplets, it exits the tunnel through the other aperture and enters the receiver, thereby performing MVD measurement of cloud and fog particles.

[0034] This device is reasonably configured, and the detection method is easy to operate. The two cloud and fog parameter measurement devices can work simultaneously to measure the MVD and LWC parameters of clouds and fog respectively. It can also reduce the energy loss of the laser due to passing through the glass, effectively realize the measurement of wind tunnel cloud and fog parameters, and the results are valid and reliable.

Claims

1. A device for simultaneously measuring cloud and fog parameters in an icing wind tunnel, characterized in that, The device includes a laser emitter, a laser receiver, a wind tunnel test section, cloud particles, an LWC hot wire measuring instrument probe, an aperture adjustment device, an auxiliary transition plate, a cornering mechanism, a PDA controller and processor, a PDA bracket, an LWC measuring instrument transition device, an aperture, and an LWC hot wire measuring instrument controller. The laser emitter (1) and laser receiver (2) are fixed on the PDA bracket (10) and connected to the PDA controller and processor (9) to form a complete PDA; The auxiliary transition plate (7) is fixed on the corner mechanism (8) installed on the tunnel body (3) of the wind tunnel test section; The LWC hot wire measuring instrument probe (5) is fixed on the auxiliary transition plate (7) through the LWC measuring instrument transition device (11) and is located inside the wind tunnel test section (3); The laser emitter (1) and the laser receiver (2) face the light hole (12). The laser from the laser emitter (1) passes through the light hole (12) and irradiates the cloud particles (4) inside the wind tunnel test section (3). After reflection and refraction, the laser enters the laser receiver (2) through the light hole (12).

2. The apparatus according to claim 1, characterized in that, The auxiliary transition plate (7) is equipped with two light holes (12), and its position is adjusted by the light hole adjustment device (6).

3. The apparatus according to claim 2, characterized in that, The LWC hot wire measuring instrument probe (5) and LWC hot wire measuring instrument controller (13) are combined to form an LWC hot wire measuring instrument.

4. The apparatus according to claim 3, characterized in that, The aperture (12) forms a certain angle with the surface of the auxiliary transition disk (7), which is half of the maximum measurement angle of the PDA.

5. The apparatus according to claim 4, characterized in that, Both the auxiliary transition plate (7) and the LWC hot wire measuring instrument probe (5) can be rotated to a preset angle for installation.

6. The apparatus according to claim 5, characterized in that, The preset angle is 90°.

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