| 筒仓中粮食卸料动压力的数值模型 |
| |
| 引用本文： | 程绪铎,唐福元,石翠霞,陆琳琳. 筒仓中粮食卸料动压力的数值模型[J]. 中国粮油学报, 2011, 26(4): 89-93,98 |
| |
| 作者姓名： | 程绪铎 唐福元 石翠霞 陆琳琳 |
| |
| 作者单位： | 南京财经大学食品科学与工程学院,南京,210003 |
| |
| 摘 要： | 筒仓中粮食卸料时拱不断形成并不断坍塌。以这些不稳定拱(瞬态拱)为依据,建立一个预测筒仓中粮食卸料动压力的数值模型。将粮食分成许多薄层,结拱层上方的粮食视为多层弹簧振子系统,建立该系统的振动方程,从而解出结拱层的加速度,再对结拱层运用动量定理,推导出粮食卸料时对仓壁的动压力。计算结果表明:粮食卸料时粮食对筒仓壁产生的动压力大于Janssen方程计算的储藏静压力,粮食卸料时超压因子随粮食深度的增加而增加,对于直径10 m的筒仓(ρ=800 kg/m3,φ=25.0,°μ=0.4,Q=1.0 kt/h,ν=0.4,Ev=30.0 MPa),粮食深度从2.0 m增加到24.0 m时,超压因子从约1.33增加到1.87;粮食卸料时超压因子随粮食流量的增大而增大,随粮食体积弹性模量的增大而增大,随粮食和仓壁摩擦系数的增大而增大,随粮食内摩擦角的增大而减小;储藏静压力和卸料动压力都随粮食和仓壁摩擦系数的增大而减小,都随粮食内摩擦角的增大而减小。
|
| 关 键 词： | 筒仓 粮食卸料 结拱 超压因子 |
Numerical Model of Dynamic Pressure of Grain Acting on Silo during Discharge |
| |
| Cheng Xuduo,Tan Fuyuan,Shi Cuxia,Liu Linlin. Numerical Model of Dynamic Pressure of Grain Acting on Silo during Discharge[J]. Journal of the Chinese Cereals and Oils Association, 2011, 26(4): 89-93,98 |
| |
| Authors: | Cheng Xuduo Tan Fuyuan Shi Cuxia Liu Linlin |
| |
| Affiliation: | Cheng Xuduo Tan Fuyuan Shi Cuxia Liu Linlin(College of Food Science and Engineering,Nanjing University of Finance and Economics,Nanjing 210003) |
| |
| Abstract: | A numerical model developed to predict dynamic pressure of grain acting on silo during discharge is based on the theory of forming instable arch.Applying theorem of momentum to the layer just above the arch,the equation of dynamic pressure of grain acting on silo during discharge is derived.The grain above the arch in the silo is divided into layers of equal mass,and the layers are connected by elastic springs;the impulse equations are derived for the grain system above the arch in the silo;the acceleration... |
| |
| Keywords: | silo discharge of grain arching factor of surpass pressure |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
