(東北電力大學(xué) 能源與動(dòng)力工程學(xué)院，吉林 132012)
摘 要: 采用離散元數(shù)值模擬法對多元顆粒在不同偏心距工況下進(jìn)行數(shù)值模擬，研究偏心滾筒對全部大顆粒的運(yùn)動(dòng)初始階段、穩(wěn)定階段的平均速度波動(dòng)的影響。結(jié)果表明：在不同偏心距的偏心滾筒中，同粒徑顆粒的平均速度波動(dòng)不同；偏心滾筒中顆粒平均速度曲線在每個(gè)運(yùn)動(dòng)周期都會(huì)出現(xiàn)波峰和波谷現(xiàn)象，且偏心距越大，該現(xiàn)象越明顯；在顆粒運(yùn)動(dòng)的初始階段，大粒徑顆粒平均速度波動(dòng)范圍大，偏心距為20 mm的滾筒中所有大顆粒平均速度波動(dòng)范圍最大；在顆粒運(yùn)動(dòng)的穩(wěn)定階段，隨著時(shí)間的延長，粒徑對于顆粒平均速度的影響不明顯。
關(guān)鍵字: 偏心距；大顆粒；顆粒運(yùn)動(dòng)；平均速度
（School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China）
Abstract:A numerical study on multiple particles under different eccentric conditions by DEM(Discrete element method) was presented. The aim is to research the influence of average speed fluctuation of larger particles by the eccentric rollers in initial and stable stages. The results show that the particles with the same size have different fluctuations of average velocity in different eccentric rollers; the average speed curves of particles in eccentric cylinder appear the peaks and troughs in a motion period, and greater eccentric rollers arise more obvious phenomenon. At the initial stage, bigger size particles have a wide range of average velocity fluctuation, the average speeds of all particles have the widest range in the 20 mm eccentricity drum. At the stable stage, the sizes of particles have no obvious impact on the average speed of particles when the particle movement gradually become stable.
Key words: eccentricity; large particle; particle motion; average velocity
