紊流度对煤炭颗粒起动和来流风速影响研究

发布时间：2018-01-20 04:41

本文关键词： 紊流度等效起动风速等效来流风速煤炭颗粒风洞试验　出处：《中国矿业大学学报》2016年01期 　论文类型：期刊论文

【摘要】：风速的脉动性对煤炭颗粒起动风速、起尘判别准则和煤堆静态起尘量有着不可忽略的影响.在煤堆起尘量经验公式的基础上,建立风速概率分布模型,推导了考虑风速脉动影响的等效起动风速和等效来流风速,通过定义修正系数来考虑风速脉动的影响,并重新定义了起尘判别准则.结合相关文献风洞试验结果,对不同紊流度和平均风速条件下的修正系数,进行了比较分析.结果表明:在特定紊流度条件下,紊流度对煤炭颗粒起动风速修正系数和来流风速修正系数均有较大的影响.特别是在D类流场,忽略紊流度效应造成的最大误差超过18%.
[Abstract]:The pulsation of wind speed has an important influence on the starting wind speed of coal particle, the criterion of dust generation and the static dust quantity of coal pile. Based on the empirical formula of dust quantity of coal pile, the probability distribution model of wind speed is established. The equivalent starting wind speed and equivalent incoming wind speed considering the influence of wind speed pulsation are deduced, and the effect of wind speed fluctuation is considered by defining the correction coefficient. Combined with the results of relevant literature wind tunnel tests, the correction coefficients under different turbulence and average wind speed conditions are compared and analyzed. The results show that: under certain turbulence conditions. The turbulence degree has great influence on the correction coefficient of the starting wind speed and the flow velocity correction coefficient of coal particles, especially in the D flow field, the maximum error caused by neglecting the turbulence effect is more than 18.
【作者单位】：交通运输部天津水运工程科学研究所;
【基金】：国家自然科学基金面上项目(51179078) 中央级公益性科研院所基本科研业务费专项资金项目(TKS140215,TKS130204)
【分类号】：X513;X736.1
【正文快照】： 港口露天堆场中,在堆取料机动态装卸和堆垛静态扬尘的共同作用下,露天堆场不断地释放出大量粉尘,不仅直接导致了大量原料的损失[1-2],而且给区域造成了严重的大气环境污染.近年来,灰霾天气越来越多,可入肺颗粒物(PM2.5)的危害性日益突出[3],对人体健康具有严重危害[4].因此,露

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