也谈雨量计虹吸线不垂直的记录处理

1.雨量计虹吸线不垂直产生的偏移时差是纵向时差 雨量计虹吸线不垂直产生虹吸上下的偏移时间差,和常规方法计算的时间差的概念是不同的。后者所说的时间差,是自记纸横坐标上的走时的快慢,是横向型的时间差;虹吸上、下的偏移时间差是虹吸迹线与纵坐标雨量标线不垂直而产生的时间差。R=f(t),雨量和时间是函数关系,因此虹吸线偏移产生的时间差是纵向型的时间差(见图1)。

虹吸式自记雨量计虹吸线中途停止记录线平底整理资料方法

本文通过建立数学模型，客观地计算虹吸订正量，并合理的分配在每次虹吸内，同时可较准确地统计每日降雨量，并对记录线出现平底现象的资料处理提供依据，减少任意性．

南水北调倒虹吸平线管体应力状态有限元分析

以肖河东沟倒虹吸疏水工程为例,借助ANSYS专业智能模拟系统,对大埋深倒虹吸管线平线段管体应力状态进行有限元分析,结果表明其结构是安全可靠的,并揭示混凝土倒虹吸平线管体材料裂开过程不能仅依靠一维状态的第一主响应力值来判定,相比之下,借助三维模型更利于分析认识混凝土倒虹吸平线管体材料的裂开过程。

介绍一种LZQ型滴流(虹吸)报警器

“滴流”致使虹吸线迹“平头”,是虹吸式雨量计常见故障,为解决此问题,提高观测质量研制了LZQ型滴流、虹吸报警器。1

降水量自动测记中推求虹吸订正量的新方法探讨

采用文章叙述的虹吸线法推求虹吸订正量 ,具有采用参数少、直观明了、快速准确的优点 ,对提高工作效率和降水资料的精度十分有利。

Electrical Capacitance Tomography Measurement of Flow Patterns and Film Thickness in a Thermosyphon

An experimental study was performed to evaluate the suitability of using an electrical capacitance tomography (ECT) system to visualize the flow patterns, and to measure the film thickness of the annular flow in a two-phase closed thermosyphon (TPCT). The performance of the ECT system was examined over a range of flow conditions.The experimental data were compared with the visual observations and existing correlations. Results indicated that the ECT system, with the linear back projection (LBP) algorithm, could be used to give an on-line qualitative image of the flow patterns. The Landweber iteration algorithm with optimal step length was implemented off-line to reconstruct high-resolution images. Then, the images were analyzed to obtain the film thickness of the annular flow. The experimental data compared well with the Nusselt's equation in low vapor velocity range, but showed an increasing deficiency with the increase of vapor velocity.