CAJ | 학술논문

为了研究仓壁材料性质、粒径对煤粉运动壁摩擦角的影响,用Jenike剪切测试仪,测试不同粒径煤试样在不锈钢板、碳钢板、环氧板3种常用仓壁材料上的运动壁摩擦力.结合Jenike松散物料流动理论,探讨了不同粒径煤试样运动壁摩擦系数的变化.结果表明:仓壁材料表面的粗糙度越大,煤粉的运动壁摩擦系数越大;材料刚度越大,煤粉的运动壁摩擦系数也越大;水分一定时,煤试样中小粒径煤粉含量越多,壁摩擦系数越大.同时,用离散单元法(DEM)对这一壁摩擦过程进行模拟研究.分析比较模拟结果和实验结果表明:数值模型能够有效模拟实验过程,仓壁材料粗糙度、刚度以及煤粉粒径对壁摩擦系数的影响规律与实验结果相同.
위료연구창벽재료성질、립경대매분운동벽마찰각적영향,용Jenike전절측시의,측시불동립경매시양재불수강판、탄강판、배양판3충상용창벽재료상적운동벽마찰력.결합Jenike송산물료류동이론,탐토료불동립경매시양운동벽마찰계수적변화.결과표명:창벽재료표면적조조도월대,매분적운동벽마찰계수월대;재료강도월대,매분적운동벽마찰계수야월대;수분일정시,매시양중소립경매분함량월다,벽마찰계수월대.동시,용리산단원법(DEM)대저일벽마찰과정진행모의연구.분석비교모의결과화실험결과표명:수치모형능구유효모의실험과정,창벽재료조조도、강도이급매분립경대벽마찰계수적영향규률여실험결과상동.
Effects of particle size and wall material on wall friction characteristics of pulverized coal were investigated by means of Jenike shear test. The wall materials include stainless steel, carbon steel and epoxy. Combining Jenike's theory of flow of particulate solids, the variation of friction co-efficient of pulverized coal with different particle size was studied. Results show that the wall friction force increases with the increasing in roughness and stiffness of wall materials, and also increases with the increasing in fine particle content of coal under same moisture capacity. On the other hand, the friction characteristics of pulverized coal were numerically simulated using the discrete element method (DEM). Comparing the results of the simulation and the experiment, reasonable agreements are obtained.