| 砾卵石起动临界条件 |
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| 引用本文： | 何文社,方铎,刘兴年,李昌志. 砾卵石起动临界条件[J]. 四川水力发电, 2003, 22(1): 64-65 |
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| 作者姓名： | 何文社 方铎 刘兴年 李昌志 |
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| 作者单位： | 四川大学,高速水力学国家重点实验室,四川,成都,610065 |
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| 基金项目： | 九五课题资助(95-5-4)，国家自然科学基金，水利部联合资助重大项目(59890200) |
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| 摘 要： | 阐述了砾卵石均匀沙的运动机理,通过对附加质量力和床面颗粒相对暴露度参数的引入,推得了均匀沙起动无因次拖曳力公式,并对公式中的系数进行了计算。结果表明,在起动状态一定时,该系数并非为一个常量,而是介于某个区间,且随颗粒在床面上的相对暴露度的变化而变。通过转化推得了散粒体均匀沙起动流速公式,同时考虑了砾卵石扁度的影响,其系数同样不是一个常量,同学者们的公式相对照较为合理,该系数包含了其它公式的系数。结论部分可以解释为何不同的作者通过实验所拟合的系数各异,且差别较大,说明文中公式基本能反映均匀沙的起动特性。
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| 关 键 词： | 砾卵石均匀沙 临界拖曳力 起动流速 起动公式 |
| 文章编号： | 1001-2184(2001)01-0064-02 |
| 修稿时间： | 2001-07-15 |
Critical Condition for Starting Motion of Gravel |
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| HE Wen she FANG Duo LIU Xing nian LI Chang zhi. Critical Condition for Starting Motion of Gravel[J]. Sichuan Water Power, 2003, 22(1): 64-65 |
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| Authors: | HE Wen she FANG Duo LIU Xing nian LI Chang zhi |
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| Abstract: | In this paper , the motion mechanism of uniform sediment is presented . By introducing the additional mass force and the relative exposure degree of grain on riverbed , the formula of dimensionless traction force for starting uniform sediment is established and coefficient in the formula is calculated . The calculation result indicates that for a given starting condition , the coefficient is not a constant , but varies with the relative exposure degree of grain . The formula of starting velocity of uniform sediment is derived and influence of gravel flatness is also considered .Its coefficient is not a constant . It is explained in conclusion that why do the coefficients gained by various authors are quite different . The formula can basically show the starting motion characteristics of uniform sediment. |
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| Keywords: | uniform sediment of gravel critical traction force starting velocity starting formula |
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