压缩气体小孔射流截面大气环境中扩张系数  

The expansion coefficient of cross-section of compressed gas jet flow

作　　者：吕东[1] 牛洁 王婕[1] 李逸轩[3] 

机构地区：[1]公安部天津消防研究所,天津300381 [2]焦作市消防支队,河南焦作454350 [3]西安交通大学数学与统计学院,陕西西安710049

出　　处：《消防科学与技术》2013年第9期942-944,共3页Fire Science and Technology

基　　金：公安部消防局应用创新计划项目"液化天然气泄漏及爆炸特征研究"(2012XFCX15);国家"十二五"科技攻关项目"石油与液化烃罐区火灾风险及对策研究"(2011BAK03B08-02)

摘　　要：在相关压缩气体泄漏的数值模拟中,对截面扩张的准确估计可增加模拟结果的可信度。以质量守恒定律为基础,对压缩气体发生小孔泄漏后射流截面扩张的计算方法及规律进行分析,并分析多种气体在不同压力和温度下的射流截面扩张。音速传播的气体,恒温下气体横截面扩张系数随压力的增大而增大,随相对分子质量的增大而减小。恒压下气体横截面扩张系数随温度升高而增大,随相对分子质量增加而减小。To estimate the cross section enlargement accurately will increase the reliability of numeric simulation on compressed gas dispersion. Based on the law of conservation of mass, the calculation method and the relevant law of compressed gas jet section expansion from small hole were analyzed. Cross section expansion of various gases jet under different pressure and tern perature was also analyzed. For the sonic gas jet, under con stant temperature, the cross section expansion ratio increases a long with the pressure increase, and decreases with the increase of relative molecular mass of gas. Under constant pressure, the cross section expansion ratio increases along with temperature increase, and decreases with increase of relative molecular mass of gas.

关 键 词：压缩气体 质量守恒 截面 扩张系数 烟羽流 

分 类 号：X913.4[环境科学与工程—安全科学] TK123[动力工程及工程热物理—工程热物理]