Unlock instant, AI-driven research and patent intelligence for your innovation.

Device and method for in-situ measurement of icing adhesion force

An in-situ measurement and adhesion technology, which is applied in the direction of measuring devices, mechanical devices, and aircraft component testing, can solve the problems of in-situ measurement of adhesion, inability to measure adhesion, extrusion and crushing, etc. Shorten the test cycle, save test time, and be easy to operate

Active Publication Date: 2022-02-11
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
View PDF19 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are some unavoidable problems in the currently proposed in situ measurement methods of adhesion
For example, in the patent CN103776763B, when the rotating cylinder is stretched, the action surface of the ice-accumulated force is much smaller than the ice adhesion area, and there will be a situation of crushing and crushing before the ice is sheared and removed, resulting in the inability to measure; it is difficult to avoid in the patent CN108181233A Ice overflow occurs on the side of the test piece, which affects the measurement accuracy of the adhesion force, and it is necessary to weigh the mass of the accumulated ice to calculate the centrifugal force after the icing stops. Since the mass of the accumulated ice is constantly changing during the dynamic growth, this method Adhesion forces cannot be measured during the dynamic growth of ice accretion
[0005] Therefore, even though there is an adhesion force measurement device in the icing wind tunnel in the prior art, the existing device cannot perform in-situ measurement of the adhesion force during the dynamic growth of ice accumulation on the aircraft skin in the icing wind tunnel

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for in-situ measurement of icing adhesion force
  • Device and method for in-situ measurement of icing adhesion force
  • Device and method for in-situ measurement of icing adhesion force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides a device for in-situ measurement of icing adhesion, including two measuring systems 1, a rotating arm 2 and a driving mechanism 3, and the two measuring systems 1 are symmetrically arranged at both ends of the rotating arm 2 , the driving mechanism 3 can drive the rotating arm 2 to rotate, such as figure 1 shown;

[0046] The present invention adopts two measurement systems 1, which are symmetrically arranged on the rotating arm 2. During the adhesion measurement, ice is formed on the two samples to be tested at the same time, and it stops when the ice accumulation on one of the samples to be tested is sheared off. Rotate, and calculate the adhesion force based on the shear load and icing area of ​​the ice accumulating on the sample to be tested. Since the mass of ice on the two samples to be tested is basically the same during the adhesion force measurement, it is possible to implement a counterweight to the rotating system, thereby eliminatin...

Embodiment 2

[0066] This embodiment provides a method for in-situ measurement of icing adhesion, using a device for in-situ measurement of icing adhesion in Example 1, comprising the following steps:

[0067] S10. fixing the sample to be tested on the support beam 121;

[0068] S20. Setting the injection angle of the cloud and mist flow field, the injection angle being the angle between the cloud and mist flow field and the surface of the sample to be measured; as Figure 8 As shown, it can be set so that the incoming flow direction 4 of the cloud field is perpendicular to the surface of the sample to be tested, or a certain angle can be set, and the test process is set according to the target to be tested;

[0069] S30. Start the spray system, so that the droplets hit the surface of the sample to be tested and start to condense into ice;

[0070] S40. After the ice accumulation on the surface of the sample to be measured grows to a set volume or a set thickness, start the drive mechanism...

Embodiment 3

[0081] The difference between this embodiment and Embodiment 2 is that a protective cover 13 is provided on the measuring device used in this embodiment.

[0082] A method for in situ measurement of icing adhesion comprising the steps of:

[0083] S10. fixing the sample to be tested on the support beam 121;

[0084] S20. Setting the injection angle of the cloud and mist flow field, the injection angle being the angle between the cloud and mist flow field and the surface of the sample to be measured; as Figure 8 As shown, it can be set that the cloud flow field 4 is perpendicular to the surface of the sample to be tested, or a certain angle can be set, and the test process is set according to the target to be tested;

[0085] S30. Start the spray system, so that the droplets hit the surface of the sample to be tested and start to condense into ice; at the same time, start the protective cover driving device 14, so that the protective cover 13 rotates around the support beam 1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention is applicable to the technical field of measurement of icing adhesion force on aircraft skin, and particularly relates to a device and a method for in-situ measurement of icing adhesion force. The device comprises a force detection component, which comprises a support beam and a strain gauge, wherein the strain gauge is adhered to the side surface of the support beam, one end of the support beam is fixed on a rotating arm, and the other end of the support beam is fixedly connected with a to-be-detected sample. According to the invention, through the structural design of the measuring device and the principle that the load on the support beam is equal to the shear load on the surface ice of the to-be-detected sample, the strain value on the support beam can be measured to calculate and measure the adhesion force of the surface ice of the to-be-detected sample; and according to the measurement method, the adhesion force in the growth of the ice on the surface of the skin of the aircraft can be measured in situ, and the adhesion force characteristic of the ice on the skin when the aircraft passes through an icing cloud layer can be truly reflected.

Description

technical field [0001] The invention relates to the technical field of measuring icing adhesion on aircraft skins, in particular to an in-situ measuring device and method for icing adhesion. Background technique [0002] When an aircraft flies over icy clouds, the skin of the aircraft will freeze, which poses a serious hidden danger to flight safety. Academic and engineering fields continue to conduct extensive research on icing phenomena in flight, icing hazards, physical characteristics of ice, and anti-icing methods, among which the adhesion characteristics of ice accumulation on the skin surface seriously affect the assessment of icing hazards , the choice of anti-icing methods, etc., are very important research contents. The icing wind tunnel can simulate the phenomenon of aircraft icing when the aircraft passes through icy clouds, and is an important equipment for studying the above problems. The in-situ measurement of ice adhesion on aircraft skin during ice growth ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04G01M9/06B64F5/60
CPCG01N19/04G01M9/06B64F5/60
Inventor 顾兴士李明易贤赖庆仁
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT