Ice shape and ice angle quantitative evaluation method and system for icing wind tunnel test
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A quantitative evaluation, wind tunnel test technology, applied in the field of aviation
Active Publication Date: 2020-08-14
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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[0007] In order to solve the problem of quantitative evaluation of ice shape and ice angle in icing wind tunnel test, the present invention provides a method and system for quantitative evaluation of ice shape and ice angle in icing wind tunnel test. It does not involv...
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Embodiment 1
[0080] A method for quantitative evaluation of ice shape and ice angle in icing wind tunnel tests, such as figure 1 shown, including the following steps:
[0081] (1) Digitized ice geometric contour lines
[0082] Digitally scan the grid drawing of the ice contour drawn in the test, define the digital coordinate system, extract the discrete coordinate points of the airfoil and the ice contour, and draw the ice contour map;
[0083] specifically,
[0084] 1-1. Use a large-format scanner to scan the grid drawing of the ice contour line, and output the digital ice contour line picture as figure 2 shown;
[0085] 1-2. Define the digital coordinate system, such as image 3 As shown, the leading edge point of the airfoil is set as the coordinate origin, the X-axis points to the tail of the airfoil along the chord line of the airfoil, and the Y-axis points from the lower airfoil (pressure surface) of the airfoil to the upper airfoil (suction surface);
[0086] 1-3. Use picture ...
Embodiment 2
[0142] Adopt a kind of icing wind tunnel test ice angle quantitative evaluation method of the present invention, calculate the ice angle characteristic parameter of flow direction ice shape, such as Figure 10 As shown, the ice corner thickness T s and angle θ s are 0.033 and 199°, respectively.
Embodiment 3
[0144] Adopt a kind of icing wind tunnel test ice angle quantitative evaluation method of the present invention, calculate the ice angle characteristic parameter of horn-like ice shape, such as Figure 11 As shown, the middle and upper ice angle thickness T du and angle θ du are 0.11 and 147° respectively, the lower ice angle thickness T dl and angle θ dl are 0.102 and 236°, respectively.
[0145] The results show that the present invention can accurately extract and calculate typical ice angle characteristic parameters, can effectively solve the problem of quantitative evaluation of ice angle in icing wind tunnel tests, and provide critical ice shape selection, anti-icing system performance evaluation, ice Provide technical support for test objectives such as model development.
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Abstract
The method is suitable for the aviation field, and provides an ice shape and ice angle quantitative evaluation method and system for an icing wind tunnel test. The method comprises the following steps: firstly, for an ice-shaped contour line obtained in an icing wind tunnel test, obtaining ice-shaped contour line discrete coordinate points by adopting an ice-shaped geometric contour line digitization method, further establishing an ice-shaped type judgment criterion for ice-shaped discrete points to judge the ice-shaped type, and calculating corresponding ice-shaped characteristic parameters according to different ice-shaped types. The evaluation method and system are suitable for large-scale test ice shape and ice angle quantitative evaluation tasks, complex mathematical formulas and time-consuming numerical iteration processes are not involved in the calculation method, and ice shape and ice angle quantitative evaluation can be completed quickly and efficiently.
Description
technical field [0001] The invention belongs to the field of aviation, and in particular relates to a method and system for quantitatively evaluating the ice shape and ice angle in an icing wind tunnel test. Background technique [0002] When an aircraft is flying in clouds, supercooled water droplets (ie, liquid water droplets whose temperature is below freezing point) in the clouds will continuously hit the windward side of the aircraft, causing the surface to freeze. Aircraft icing widely exists in flight practice and seriously threatens flight safety. The icing wind tunnel is an important ground test equipment for aircraft icing research and aircraft component anti-icing system verification, and it plays an important role in aircraft icing airworthiness certification. In the icing wind tunnel test, the geometric profile of the ice accretion shape is the most important icing test result, and it is the key parameter for the selection of critical ice shape, performance eva...
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IPC IPC(8): G06F30/15G06F30/20G06F111/10
CPCG06F30/15G06F30/20G06F2111/10
Inventor 郭向东赵献礼陈圆圆白云卯
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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