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A Method for Forming Frost and Ice Shapes of Horizontal Axis Wind Turbine Blades Based on Polynomial Fitting

A polynomial fitting, wind turbine blade technology, applied in the field of wind turbine blade ice formation calculation, can solve problems such as large amount of calculation, complex heat and mass transfer, etc., and achieve the effect of simple and reliable calculation process

Active Publication Date: 2020-11-03
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the icing simulation calculation considering the heat and mass transfer process is highly interdisciplinary, and compared with the 2D airfoil icing, the 3D blade ice shape simulation requires more complex heat and mass transfer and ice growth analysis. Large amount of calculation

Method used

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  • A Method for Forming Frost and Ice Shapes of Horizontal Axis Wind Turbine Blades Based on Polynomial Fitting
  • A Method for Forming Frost and Ice Shapes of Horizontal Axis Wind Turbine Blades Based on Polynomial Fitting
  • A Method for Forming Frost and Ice Shapes of Horizontal Axis Wind Turbine Blades Based on Polynomial Fitting

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Embodiment

[0046] 1. The special airfoil S809 for wind turbines of the American Renewable Energy Laboratory was selected as the research object. The S809 airfoil has a maximum relative thickness of 21% at 39.5% of the chord length and a maximum relative camber of 0.99% at 82.3% of the chord length. Using the icing software LEWICE3.2 to obtain the ice shape of the S809 airfoil with a chord length of 1m, and using the LIEEAS method to fit the ice shape curve, the results are as follows figure 2 shown. The parameters of frost and ice conditions are set as follows: the diameter of water droplets is 20μm, the wind speed is 50m / s, the ice accumulation time is 1800s, and the liquid water content is 0.05g / m 3 , the ambient temperature is -10°C, the pressure is 101330Pa, and the angle of attack is 4°.

[0047] The results show that the fitted two-dimensional frost ice shape curve is very consistent with the LEWICE results, so the proposed LIEEAS method is suitable for ice shape fitting of frost...

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Abstract

The invention discloses a horizontal axis wind turbine blade rime ice-shape forming method based on polynomial fitting. The horizontal axis wind turbine blade rime ice-shape forming method comprises the following steps that a linear interpolation algorithm is adopted, the airfoil rime ice-shape obtained by the LEWCE 2D software or the ice wind tunnel experiment is subjected to curve fitting in thefirst quadrant and the fourth quadrant with equal intervals as step sizes and in the second quadrant and the third quadrant with equal angles as step lengths. According to the mathematical dimensionality reduction thought, the coordinates of a plurality of section rime ice-shape key points which are evenly distributed in the blade extension direction are respectively mapped into a swing surface and a waving surface, an S809 airfoil blade rime ice-shape with variable chord length and twist angle is obtained through using polynomial fitting, and the blade rime ice-shape forming method based onpolynomial fitting is provided. According to the horizontal axis wind turbine blade rime ice-shape forming method based on polynomial fitting, the three-dimensional rime ice-shaped analysis of the blade does not need to consider subject cross, and the calculation process is simple and reliable.

Description

technical field [0001] The invention belongs to the technical field of calculation of ice shape formation of wind turbine blades, and in particular relates to a method for forming frost and ice shape of horizontal axis wind turbine blades by using linear difference and polynomial fitting. Background technique [0002] Horizontal axis wind turbines are mostly installed in areas with harsh environments such as alpine, coastal, and frequent sandstorms. They often encounter rain, snow, sand and dust, and some extreme weather, and inevitably face the problem of blade icing during operation. Icing will change the aerodynamic shape of the blades, which will greatly reduce the annual power generation of the wind turbine; icing will also increase the static and dynamic loads and affect the service life of the blades. Therefore, obtaining the icing shape of the blade surface accurately and quickly has important theoretical significance and engineering application value for the analysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D80/40F03D17/00F03D80/00G06Q50/06
CPCY02E10/72Y02P70/50
Inventor 张旭王格格余翔李伟张逍遥
Owner TIANJIN POLYTECHNIC UNIV
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