| 同向流中椭圆喷口射流掺混特性实验研究 |
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| 引用本文： | 高柱,陈和春,唐洪武,陈红.同向流中椭圆喷口射流掺混特性实验研究[J].海洋工程,2008,26(2):54-62. |
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| 作者姓名： | 高柱 陈和春 唐洪武 陈红 |
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| 作者单位： | 1. 三峡大学,土木水电学院,湖北,宜昌,443002
2. 河海大学,水利水电工程学院,江苏,南京,210098 |
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| 基金项目： | 三峡大学校科研和教改项目
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国家自然科学基金 |
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| 摘 要： | 采用激光诱导荧光技术(laser induced fluorescence-LIF)对同向流动环境中具有不同喷口高宽比(aspect ratio-AR)、射流比(velocity ratio-VR)的椭圆喷口射流与圆喷口射流的标量物质浓度场进行可视化和定量化研究。系统研究了同向流动环境中椭圆喷口射流浓度场的各种掺混稀释特性:中心线稀释度,射流扩展宽度,下游不同断面上的时均浓度分布和紊动强度分布。采用紊流理论和量纲分析方法对实验数据进行分析讨论,给出同向流动环境中受动量控制的椭圆射流稀释度预报方法,提出该类椭圆射流稀释度预报方法归并到已有圆射流系列预报模型中的实现途径,比较了具有相同出口超值动量Me0的圆射流与椭圆射流的沿程稀释度变化。由于椭圆射流比圆射流具有更高的稀释度增长比率,说明椭圆射流比圆射流具有更好的掺混稀释效果。
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| 关 键 词： | 椭圆射流 稀释度预报 LIF技术 同向流 |
| 文章编号： | 1005-9865(2008)02-0054-09 |
| 修稿时间： | 2007年7月10日 |
Mixing characteristics of jets with elliptic nozzles in coflow experimental research |
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| GAO Zhu,CHEN He-chun,TANG Hong-wu,CHEN Hong.Mixing characteristics of jets with elliptic nozzles in coflow experimental research[J].Ocean Engineering,2008,26(2):54-62. |
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| Authors: | GAO Zhu CHEN He-chun TANG Hong-wu CHEN Hong |
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| Abstract: | An experimental investigation of turbulent jets from elliptic nozzles and round nozzles is presented.The flow fields are visualized and quantified by LIF(Laser Induced Fluorescence) technique.The jet centerline dilution,jet spreading,mean concentration profiles and turbulence intensity profiles at different downstream stations were measured and evaluated.Using the turbulence theory and dimensional analysis method,the dilution prediction methods for the coflowing elliptic jets controlled by momentum and the practical procedure of integrating the dilution prediction methods of the coflowing elliptic jet into the round jets models are presented.The mixing characteristics of elliptic jets and round jets with the same exit momentum are compared.Since the elliptic jets have higher dilution ratios,the elliptic jets having a better dilution effects than round jets are validated. |
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| Keywords: | elliptic jet dilution prediction LIF technique coflow |
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