Surface convection heat transfer coefficient measuring device based on constant heat flow method
A technology of convection heat transfer coefficient and measuring device, which is applied in the direction of material thermal development and can solve the problems of complex realization process and so on.
Active Publication Date: 2016-11-30
COMAC +1
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Problems solved by technology
The constant wall temperature method requires precise control of the surface temperature, and in an external strong convection environment, it is necessary to separately control the heating source at a local location to ensure that the temperature of any measured point is the same, so that the convection conversion can be calculated according to different heating power. Thermal coefficient, the implementation process is more complicated
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Embodiment Construction
[0042] Basic design principle of the present invention
[0043] The basic design principles of the present invention will be described below through an embodiment of the present invention. As an embodiment of the present invention, a section of wing is used as a test piece 1, and the test piece 1 includes a skin 2, that is, a curved sheet of the present invention. In order to obtain the convective heat transfer coefficient of the surface of the skin 2, a part of the inner surface segment is selected on the inner surface of the skin 2 of the test piece 1, and the figure 1 In the shown embodiment, the positions of two long and narrow inner surface segments extending along the chord direction are selected at a certain distance, and electric heating mats 11 and 12 of a certain width are installed on the two inner surface segments along the chord direction. For illustration purposes, figure 1 The positions of the electric heating pads 11 and 12 along the span and chord directions...
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Abstract
The present invention provides a measuring device for the surface convective heat transfer coefficient of a curved sheet, the measuring device comprising: at least one electric heating pad, the electric heating pad is flexible so that it can be bent to conform to the surface of the sheet The inner surface has the same shape, the electric heating pad includes an insulating heat transfer layer, a heating element layer and an insulating heat insulating layer, and the heating element layer is fixedly connected between the insulating heat transfer layer and the insulating heat insulating layer , the electric heating pad is configured such that the insulating heat transfer layer is in close contact with the first surface of the inner surface of the sheet; at least one temperature sensor, the temperature sensor is connected between the sheet and the first surface of the sheet On the second surface of the outer surface opposite to the first surface of the inner surface; the control device is used to control the parameter to be controlled of the electric heating mat. The present invention also includes a method for measuring the convective heat transfer coefficient of the sheet by using the above-mentioned measuring device.
Description
technical field [0001] The invention relates to a measuring device for the convective heat transfer coefficient of a curved surface. In particular, it relates to a measurement method for measuring the convective heat transfer coefficient outside the leading edge of a wing by means of a wind tunnel. Background technique [0002] Aviation practice shows that aircraft icing is one of the important hidden dangers of flight safety. It has become a problem that must be paid attention to in the aviation industry, and it is also a test that must be done when airworthiness certification is obtained through wind tunnel tests. The icing state of the aircraft wing is related to the convective heat transfer coefficient of the aircraft wing. [0003] At present, in the field of aviation industry, the convective heat transfer coefficient of the concerned surface is usually obtained through numerical simulation. Although the current numerical simulation method is relatively mature, it is u...
Claims
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IPC IPC(8): G01N25/20
Inventor 霍西恒曾飞雄李志茂王大伟杜延平南国鹏李革萍
Owner COMAC