| 限流沿对撞壁射流近壁区混合过程影响的实验研究(二) |
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| 引用本文： | 林荣文,苏万华,谢辉,史绍熙. 限流沿对撞壁射流近壁区混合过程影响的实验研究(二)[J]. 工程热物理学报, 1998, 0(1) |
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| 作者姓名： | 林荣文 苏万华 谢辉 史绍熙 |
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| 作者单位： | 天津大学内燃机燃烧学国家重点实验室!天津,300072,天津大学内燃机燃烧学国家重点实验室!天津,300072,天津大学内燃机燃烧学国家重点实验室!天津,300072,天津大学内燃机燃烧学国家重点实验室!天津,300072 |
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| 摘 要： | 1前言本文的第一部分分析了射流气体撞击限流沿后的发展过程以及射流入射角、限流沿高度等对二次射流气体发展情况的影响。本文将详细分析射流气体撞击限流沿后所形成的二次射流的速度和浓度的分布规律,并利用标量耗散率描述了射流气体的混合情况。众所周知,混合是扩散火焰燃烧速度的控制因素。通常扩散燃烧区内的温度足以使燃烧化学反应瞬间完成,因此燃烧时间完全取决于混合时间,即燃烧反应的速率由混合速率来控制。RW．Bilger等[1]认为扩散燃烧反应只有当完全达到分子级混合时才发生,他们在研究中利用标量耗散率概念来描述分子级混…
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| 关 键 词： | 撞壁射流 混合率 浓度耗散率 |
INVESTIGATION OF EFFECT OF A BUMP ON NEAR WALL MIXING PROCESS OF AN IMPINGING JET (II) |
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| LIN Rongwen, SU Wanhua, XIE Hui ,SHI Shao-xi. INVESTIGATION OF EFFECT OF A BUMP ON NEAR WALL MIXING PROCESS OF AN IMPINGING JET (II)[J]. Journal of Engineering Thermophysics, 1998, 0(1) |
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| Authors: | LIN Rongwen SU Wanhua XIE Hui SHI Shao-xi |
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| Affiliation: | National Engine Combustion Laboratory Tianjin University Tianjin 300072 |
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| Abstract: | The spatial distribution of concentration and velocity of a gas jet impinging with abump is studied in this paper. The conception of mean dispersion rate of concentrationis employed to describe the mixing process of gas jet in the near wall. The result showsthat the radial non-dimensional distribution of concentration and velocity of the second jetare normal, the axial nonudimensional distribution of concentration is exponential and theaxial non-dimensional distribution of velocity is lineal. The mixing rate of the jet gas in thenear wall is enhanced because of the existence of the bump. Base on these results, a new"space-wall-space" mixing conception for small or medium D.I. diesel engine is proposed. |
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| Keywords: | impinging jet mixing rate concentration dispersion rate |
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