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Locally resolved flow diagnostics by means of lightfield measurements

通过光场测量进行局部解析的流量诊断

基本信息

批准号：
325614075
负责人：
Dr.-Ing. Stefan Löhle
金额：
--
依托单位：
Institut für Raumfahrtsysteme (IRS)
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/325614075?language=en
关键词：
Locally resolved flow diagnostics means

项目摘要

The understanding of high-enthalpy flowfields such as in combustion processes, plasma technology and hypersonic flight lacks the measurement of the instantaneous, three-dimensional distribution of temperatures and species. In general, non-intrusive optical diagnostic methods are a versatile tool for the analysis, but may require extensive optical access, which is very often limited in the problems of interest. Other optical diagnostics reach a high level of resolution, but are limited to two dimensions.This project aims at using lightfield analysis for the characterisation of high-enthalpy flows. In principle, this technology allows to determine spatial distributions from one single photographic exposure. Lightfield imaging has recently become commercially available. However, it has not yet been used for analysing flowfields, particularly not hot, chemically reactive and brightly luminous flows as for example in ground testing facilities for hypersonic flight.In a first step the algorithms required for the analysis of three-dimensional scalar fields shall be developed and implemented. The methods are then validated with the aid of lightfield images taken with a commercial camera system and appropriate phantoms. This forms the basis for using lightfield images of the high-enthalpy flow to determine the instantaneous, spatial (3D) distribution of the chemically reacting species. Such an acquisition is unique and of crucial importance for the assessment of high speed reacting flows.

对燃烧过程、等离子体技术和高超音速飞行等高焓流场的理解缺乏对温度和物质的瞬时三维分布的测量。一般来说，非侵入式光学诊断方法是一种通用的分析工具，但可能需要广泛的光学访问，这通常仅限于感兴趣的问题。其他光学诊断达到了很高的分辨率，但仅限于二维。该项目旨在使用光场分析来表征高焓流。原则上，该技术允许通过一次摄影曝光来确定空间分布。光场成像最近已商业化。然而，它尚未用于分析流场，特别是热流、化学反应流和明亮的发光流，例如高超音速飞行的地面测试设施。第一步，应开发和实施分析三维标量场所需的算法。然后借助商业相机系统和适当的模型拍摄的光场图像来验证这些方法。这构成了使用高焓流的光场图像来确定化学反应物质的瞬时空间 (3D) 分布的基础。这种采集是独特的，对于高速反应流的评估至关重要。