风机桨叶用PVC和巴塞木雷击电弧损伤的分子模拟研究

发布时间：2018-03-22 00:35

本文选题：风机桨叶损伤　切入点：化学裂解　出处：《中国电机工程学报》2017年01期 　论文类型：期刊论文

【摘要】：雷击电弧热效应下风机桨叶夹层材料PVC和巴塞木的损伤机制尚不明晰。该文对PVC和巴塞木开展冲击大电流实验,发现在雷击电弧热效应下,PVC和巴塞木残余强度明显下降,且PVC下降速度更快。采用分子反应动力学仿真手段,对PVC和巴塞木的损伤机制进行研究,发现:冲击热场下,纤维素(巴塞木主要成分)大分子链逐渐断裂,聚合度呈波动下降,而PVC聚合度下降幅度比纤维素小。峰值温度为1498K时,PVC产气量远大于纤维素,而当峰值温度升至2998K时,纤维素产气量逐渐与PVC持平。纤维素分子通过氢键吸附较多水分子,在高温作用下水分受热膨胀成为纤维素损伤的关键因素,而PVC中水分含量较少。上述结果可为不同环境的风机叶片夹层材料优化选型提供参考。
[Abstract]:The damage mechanism of blower blade interlayer material PVC and Basewood under the effect of lightning strike arc heat is not clear. In this paper, the impact high current experiments on PVC and Basewood are carried out, and it is found that the residual strength of PVC and Basewood decrease obviously under the effect of lightning arc heat. The damage mechanism of PVC and Basewood was studied by means of molecular reaction dynamics simulation. It was found that the macromolecular chain of cellulose (the main component of Basewood) broke gradually under impact thermal field. The degree of polymerization decreased, while the degree of polymerization of PVC decreased less than that of cellulose. The gas production of PVC was much larger than that of cellulose at the peak temperature of 1498K, but when the peak temperature was up to 2998K, the gas production of PVC was much larger than that of cellulose. The gas production of cellulose is gradually equal to that of PVC. Cellulose molecules adsorb more water molecules by hydrogen bond, and water expansion under high temperature becomes the key factor of cellulose damage. However, the moisture content in PVC is less. The above results can be used as reference for the optimum selection of sandwich materials for fan blades in different environments.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);山东大学电气工程学院;中材科技风电叶片股份有限公司;利物浦大学;
【基金】：国家自然科学基金国际合作重点项目(51420105011)~~
【分类号】：TM614

【相似文献】