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首页> 外文会议>Combustion and flow diagnostics and fundamental advances in thermal and fluid sciences, 2009 >Simultaneous Quantitative Measurements of Temperature and Residual Gas Fields Inside a Fired Si-Engine Using Acetone Laser-Induced Fluorescence
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Simultaneous Quantitative Measurements of Temperature and Residual Gas Fields Inside a Fired Si-Engine Using Acetone Laser-Induced Fluorescence

机译：利用丙酮激光诱导的荧光同时定量测量点火式Si发动机内部的温度和残余气体场

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摘要

In most optimization strategies of combustion processes in gasoline IC engines, spatial inhomogeneities of the temperature, of the residual exhaust gas and of the fuel-air distribution play a major role. Hence, the development of experimental methods for the simultaneous quantification of both, concentration and temperature fields, is highly desirable. One method which is in particular suitable for measuring these quantities is the technique of two-laser excitation of the fluorescence of ketones like 3-pentanone and acetone. Different groups have used 3-pentanone for the measurement of fuel concentration. In this work we present the determination of the exhaust gas concentration field simultaneously with the temperature field using acetone as an intake air tracer. Acetone is a more suitable gas tracer than 3-pentanone due to its higher vapor pressure and its better stability regarding thermal decomposition.In the first part of this work results from the calibration of the fluorescence behavior of acetone are presented. Relative signal intensities for the excitation wavelengths 248 nm and 308 nm are given with respect to standard conditions of 295 K and 0.1 MPa. Also the directly measured intensity ratio of both wavelengths for temperature measurements is given. The results are presented for two bath gases, air and a synthetic exhaust-gas-air-mixture. Temperatures and pressures are varied simultaneously in the range from 295 K to 728 K and 0.05 MPa to 2 MPa, respectively. In the second part, two-dimensional in-cylinder measurements of temperature and exhaust gas fraction are presented for the intake and compression stroke in a fired Sl-engine with optical access. The temperature measurements during compression stroke match very well a polytropic approximation. Simultaneously acquired temperature and exhaust gas fields during intake stroke are presented. Additional information is given on the achievable accuracy and precision of these in-cylinder measurements.
机译：在大多数汽油IC发动机燃烧过程的优化策略中，温度，残余废气和燃料-空气分布的空间不均匀性起着重要作用。因此，非常需要开发同时量化浓度和温度场的实验方法。一种特别适合于测量这些量的方法是对诸如3-戊酮和丙酮之类的酮的荧光进行两次激光激发的技术。不同的小组已经使用3-戊酮来测量燃料浓度。在这项工作中，我们介绍了使用丙酮作为进气示踪剂同时确定废气浓度场和温度场的方法。丙酮具有更高的蒸气压和更好的热分解稳定性，因此它是比3-戊酮更适合的气体示踪剂。本文的第一部分介绍了丙酮荧光行为的标定结果。相对于295 K和0.1 MPa的标准条件，给出了248 nm和308 nm激发波长的相对信号强度。还给出了用于温度测量的两个波长的直接测量强度比。给出了两种浴气，空气和合成废气-空气混合物的结果。温度和压力分别在295 K至728 K和0.05 MPa至2 MPa范围内同时变化。在第二部分中，介绍了带有光学通道的Sl发动机的进气和压缩冲程的二维缸内温度和废气分数测量值。压缩冲程期间的温度测量值非常适合多变近似。介绍了进气冲程中同时获取的温度场和排气场。有关这些缸内测量可达到的精度和精确度的更多信息。

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  • 会议地点 Detroit MI(US);Detroit MI(US)
  • 作者

    M. Loeffler; K. Kroeckel; P. Koch; F. Beyrau; A. Leipertz; S. Grasreiner; A. Heinisch;

  • 作者单位

    Erlangen Graduate School in Advanced Optical Technologies Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Germany;

    Lehrstuhl fuer Technische Thermodynamik (LTT) Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Germany Robert Bosch GmbH, Stuttgart, Germany;

    Lehrstuhl fuer Technische Thermodynamik (LTT) Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Germany;

    Lehrstuhl fuer Technische Thermodynamik (LTT) Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Germany Department of Mechanical Engineering, Imperial College London, UK;

    Erlangen Graduate School in Advanced Optical Technologies Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Germany;

    BMW Group, Germany;

    BMW Group, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 汽车理论;
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