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Multi-parameter determination in practical combustion systems by broadband high-speed absorption spectroscopy

宽带高速吸收光谱法测定实际燃烧系统中的多参数

基本信息

批准号：
280430351
负责人：
Professor Dr.-Ing. Stefan Will
金额：
--
依托单位：
Lehrstuhl für Technische Thermodynamik (LTT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/280430351?language=en
关键词：
Multi parameter determination practical combustion

项目摘要

This project aims at the development and application of a novel sensitive high-speed absorption based measurement system for a comprehensive characterization of combustion processes. For the first time, the planned system allows for the simultaneous high-speed detection of temperature (via H2O-absorption lines) and important combustion intermediates (H2O2, C2H2) as well as main combustion products (H2O, CO2, CO) in a wide temperature and pressure range. Main parts are a supercontinuum light source and a high-speed near-infrared line-camera. The novel light source overcomes the limited spectral bandwidth of previous absorption based concepts. The line-detector is used as sensor in a highly resolving, modular spectrograph and allows for acquisition rates of up to 10 kHz. Because of the high spectral power density of the supercontinuum light source, the setup further facilitates the implementation of an optical cavity to extend the beam path within the measurement volume without a reduction of the detection rates.In the first phase of the project the measurement system will be built up and fundamentally characterized. Here, special focus is laid on the control of the linearity of the line detector as well as on the determination of the resolution, i.e. the instrumental function of the spectrograph. Further, the influence of additional partially reflective surfaces within the cavity with respect to the effective beam path will be quantified. Subsequently, an evaluation algorithm will be developed, based on calibration measurements, and the measurement system will be applied to a 1D-flat flame burner. Finally multi-parameter determination will be accomplished in a rapid compression machine (RCM) under IC engine conditions. In the RCM two-stage combustion characteristics of different surrogate fuels will be investigated under varied exhaust gas content and compression ratio. The temperature trace prior to and within the ignition process as well as the duration of the first phase combustion and the maximum temperature peak are important parameters for the further development of modern combustion concepts such as low temperature combustion (LTC).The newly developed measurement system will be applied to an optically accessible research engine in the second phase of the project. Additional focus will then be laid on the construction of a tomographic sensor applicable to measure cycle-resolved 2D-temperature fields in engines.

本项目旨在开发和应用一种新型的灵敏的高速吸收测量系统，用于燃烧过程的综合表征。该系统首次允许在宽温度和压力范围内同时高速检测温度（通过H2O吸收线）和重要的燃烧中间产物（H2O2、C2H2）以及主要燃烧产物（H2O、CO2、CO）。其主要部分是超连续谱光源和高速近红外线阵相机。该新颖光源克服了先前基于吸收的概念的有限光谱带宽。线检测器用作高分辨率模块化光谱仪中的传感器，并允许高达10 kHz的采集速率。由于超连续谱光源的高光谱功率密度，该装置进一步促进了光学腔的实施，以延长测量体积内的光路，而不会降低检测率。在项目的第一阶段，将建立测量系统并进行基本表征。在这里，特别关注的是控制线性检测器的线性度以及分辨率的确定，即光谱仪的仪器功能。此外，将量化腔体内的附加部分反射表面相对于有效光束路径的影响。随后，将开发一个评估算法，校准测量的基础上，测量系统将被应用到一维平面火焰燃烧器。最后，在快速压缩机（RCM）上完成了内燃机工况下的多参数确定。在RCM中，将研究不同替代燃料在不同废气含量和压缩比下的两级燃烧特性。点火前和点火过程中的温度轨迹以及第一阶段燃烧的持续时间和最高温度峰值是进一步发展现代燃烧概念（如低温燃烧（LTC））的重要参数。新开发的测量系统将在项目的第二阶段应用于光学可访问的研究发动机。另外，重点将放在适用于测量发动机循环分辨二维温度场的断层传感器的构造上。