【摘 要】
：
A series of experiments were carried out on multi-horizontal submerged jets with four different model scales of 1:36, 1:57, 1:80, 1:200. In routine tests, scale
【机 构】
：
State Key Laboratory of Hydraulics and Mountain River Engineering
【基金项目】
：
the Program for New Century Excellent Talents in University;the Science Foundation of Ministry of Education of China;the National Key Basic Research Program of China(973 Program)
论文部分内容阅读
A series of experiments were carried out on multi-horizontal submerged jets with four different model scales of 1:36, 1:57, 1:80, 1:200. In routine tests, scale effects have to be considered, due to complex vortex structure and strong air entrainment in stilling basin. Our focus was laid on measuring and analyzing the time-averaged pressure distribution, water depth and closed-to-bed velocity in the stilling basin of multi-horizontal submerged jets. The experiments results show that the model scale has but a slight effect on the time-averaged hydraulic characteristics in the stilling basin of multi-horizontal submerged jets, which indicates that the results of time-averaged hydraulic characteristics for a normal pressure model are reliable. However, the scale effects of air entrainment, fluctuation pressure and vortex structure call for further investigations in order to make the results of experiments serve as scientific references for practical engineering.
其他文献
“自主学习”模式逐步成为语言学习过程中的重要模式,特别是在日趋发达的网络环境下的大学英语听说教学。而现阶段由传统教学模式向自主学习模式的转化需要我们不断地探索。
以新疆小麦新春6号和新春9号为材料,研究在NaCl和Na2SO4的胁迫下对种子发芽及幼苗生长的影响.利用不同浓度的两种盐分溶液处理两个品种的种子进行发芽实验,测定幼苗的生长指
官僚主义不断膨胀会使社会管理困难重重,以往的理论都不能很好地解决这道难题。我们尝试运用自组织的协同学理论分析官僚主义产生的根源,提出抑制官僚主义膨胀的可行性建议。
目的 探讨重组腺病毒介导的热休克蛋白70(HSP70)基因转染对肝细胞缺血再灌注损伤的保护作用.方法 用Cre酶介导的loxP位点特异性重组的方法,构建HSP70腺病毒载体;体外转染人正
通过小区试验表明,小麦参试各品种生育期在253~255天,较对照差异不大,均表现为早熟;各品种株高都比对照矮,尤其是济南17号和衡7228株高偏低;综合产量结构三因素和产量水平,以
大学新生的数学基础呈现整体下滑的局面，独立学院的数学教育普遍面临着学生“学不好、不爱学、学不会”数学的教学现状，为了提高数学教学质量以及学生学习数学的积极性，我们在教
Phreatic water resources are widely found in thick unconsolidated surface layers in western China, where water levels respond sensitively and quickly to large-s
Compressibility factor (z-factor) values of natural gases are necessary in most petroleum engineering calculations. Necessity arises when there are few availabl
A vertical two-dimensional numerical model has been applied to solving the Reynolds Averaged NavierStokes (RANS) equations in the simulation of current and wave
《电子商务概论》是一门新兴学科,通常是作为大学教育中相关专业基础课之一,课程中有很多行业术语、基本概念、规则,教学过程容易流于枯燥。网络技术部分专业性强,难于展开。