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气体测漏实验中基于LabWindows/CVI环境的GPIB通信 被引量:2
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作者 李军 叶阳春 包钢 《机床与液压》 北大核心 2006年第6期196-198,201,共4页
介绍了气体测漏实验中基于LabW indows/CVI环境下GPIB通信。通过调用AX5488接口卡的动态连接库对带有IEEE-488接口的数字压力计进行编程控制,这种通信方式能够在气体测漏实验测试系统中精确快速地实现压力采集。
关键词 气体测漏 GPIB LABWINDOWS/CVI AX5488接口卡
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基于ARM的气体泄漏检测仪设计 被引量:6
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作者 陈骥 刘磊 《传感器与微系统》 CSCD 北大核心 2011年第11期111-114,共4页
为了提高气体检漏仪的智能化水平,设计了一种基于ARM9硬件平台的气体测漏仪。系统以S3C2440为控制核心,采用高精度A/D转换器,双气路设计和压力检测法检测气密性,具有自检,数字显示,实时曲线绘图和数据存储功能。实验表明:该系统不仅操... 为了提高气体检漏仪的智能化水平,设计了一种基于ARM9硬件平台的气体测漏仪。系统以S3C2440为控制核心,采用高精度A/D转换器,双气路设计和压力检测法检测气密性,具有自检,数字显示,实时曲线绘图和数据存储功能。实验表明:该系统不仅操作简单,满足在线检测的要求,且有很好的重复性。 展开更多
关键词 气体测漏 ARM9 双气路
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Numerical investigation of turbulent bubbly wakes created by the ventilated partial cavity 被引量:1
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作者 XIANG Min ZHANG WeiHua +1 位作者 CHEUNG S.C.P. TU JiYuan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第2期297-304,共8页
This paper presents a numerical study on the turbulent bubbly wakes created by the ventilated partial cavity.A semi-empirical approach is introduced to model the discrete interface of the ventilated cavity and its com... This paper presents a numerical study on the turbulent bubbly wakes created by the ventilated partial cavity.A semi-empirical approach is introduced to model the discrete interface of the ventilated cavity and its complex gas leakage rate induced by the local turbulent shear stress.Based on the Eulerian-Eulerian two-fluid modeling framework,a population balance approach based on MUltiple-SIze-Group (MUSIG) model is incorporated to simulate the size evolution of the sheared off microbubbles and its complex interactions with the two-phase flow structure in the wake region.Numerical predictions at various axial locations downstream of the test body were in satisfactory agreement with the experimental measurements.The captured bubbly wake structure illustrates that the bubbles may disperse as a twin-vortex tube driven by gravity effect.The predicted Sauter mean bubble diameter has confirmed the dominance of the coleascense process in the axial direction.As the bubbles develop downstream,the coleascense and breakup rate gradually reach balance,resulting in the stable bubble diameter.A close examination of the flow structures,gas void fraction distributions and the bubble size evolution provides valuable insights into the complex physical phenomenon induced by ventilated cavity. 展开更多
关键词 ventilated cavity population balance bubbly wake computational fluid dynamics
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