Numerical Simulation of Blade Coating Eroded by Random Aeolian Sand
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摘要: 为了研究风机叶片涂层在随机风沙下的失效形式,本文对随机风沙冲蚀叶片进行数值模拟。以内蒙古为例,利用威布尔分布模型建立随机风速模型,并通过EDEM与Fluent耦合进行风沙冲蚀仿真,分析流固耦合面FSI动态压力的时间历程数据以及沙粒冲击叶片涂层的冲击载荷,最后利用有限元方法将所得的随机载荷施加到叶片模型进行分析。结果显示:知流固耦合面FSI的动压介于20~140 Pa之间,沙粒的冲击载荷介于0.4~7.9 N之间,均具有显著的随机性,叶片涂层的最大应力响应为2.79 MPa,位于叶片尖端前缘及其侧面附近。Abstract: In order to study the failure mode of the fan blade coating under random sand erosion, numerical simulation is carried out for the blade erosion by random sand erosion. Taking Inner Mongolia as an example, Weibull distribution model for random wind speed is established, and by coupling Fluent with EDEM sand erosion simulation and analysis of fluid-solid coupling surface forms the time course of the FSI dynamic pressure data and the grains of sand shock impact load of blade coating, finally the random load obtained by using finite element method applied to the blade model is analyzed. The results show that the dynamic pressure of FSI on the fluid-solid coupling surface is between 20-140 Pa, and the impact load of sand particles is between 0.4-7.9 N, both of which have significant randomness. The maximum stress response of the blade coating is 2.79 MPa, located near the leading edge of the blade tip and its side.
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Key words:
- numerical simulation /
- fan blades /
- erosion /
- finite element analysis
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表 1 叶片建模参数
截面 截面占
位r/R翼型 攻角
αi/(°)入流角
ϕi/(°)安装角
βi/(°)弦长
ci/m1 0.17 FX77-343 8.5 26.82 18.32 4.12 2 0.42 S818 7.5 12.50 5.00 3.00 3 0.57 S818 7.5 9.40 1.90 2.30 4 0.75 S830 6.0 7.20 1.20 1.74 5 0.95 S831 5.0 5.71 0.71 1.46 6 1.00 S831 5.0 5.42 0.42 1.39 表 2 库布齐沙漠沙粒粒径分布及其含量分布
沙粒直径/mm 含量/% > 0.500 0 ~ 1.34 0.500 ~ 0.250 2.54 ~ 4.83 0.250 ~ 0.100 55.34 ~ 71.28 0.100 ~ 0.074 16.66 ~ 23.08 < 0.074 6.69 ~ 11.93 表 3 沙粒粒径分布及含量分布
沙粒直径/mm 含量/% 1.000 1 0.500 5 0.250 71 0.100 23 表 4 二氧化硅物性参数
密度/(g·mm−3) 泊松比 弹性模量/GPa 2.7 0.25 40 表 5 聚氨酯涂层物性参数
密度/
(g·mm−3)泊松比 弹性模量/
GPa屈服强度/
MPa抗拉强度/
MPa1.64 0.487 600 11 32 -
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