Forward projected background oriented Schlieren for study of sparks in internal combustion engines

IF 2.5 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2025-05-27 DOI:10.1007/s00348-025-04041-w

Saraschandran Kottakalam, Gregor Rottenkolber, Christian Trapp

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引用次数: 0

Abstract

The use of renewable fuels, such as hydrogen, in internal combustion engines necessitates the development of innovative combustion strategies, which in turn demand a profound comprehension of the underlying ignition phenomena. Consequently, there arises a necessity for advanced or novel measurement techniques that can offer further insights into these phenomena. As part of a study to better understand the ignition phenomenon, this paper presents a modified Background Oriented Schlieren (BOS) method developed to study the heat transferred from sparks generated by spark plugs utilising a projected background in combination with the fast checkerboard demodulation (FCD) technique. This method provides a flexible and more suitable alternative to other BOS techniques for analysing spark ignition phenomena due to the high-resolution visualisation (spatial and temporal) even at higher pressures. Using this technique, the temperature fields generated by the spark were estimated using a simplified calibration. This work also demonstrates the use of the aforementioned method to obtain a high spatial resolution, high-speed visualisation of the heat transferred from the spark to the surrounding non-combustible medium, and the interaction of the spark with the flow field at 11 bar absolute pressure.

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用于内燃机火花研究的正投影背景定向纹影

在内燃机中使用可再生燃料，如氢气，需要开发创新的燃烧策略，这反过来又需要对潜在的点火现象有深刻的理解。因此，有必要采用先进或新颖的测量技术，以进一步了解这些现象。为了更好地理解点火现象，本文提出了一种改进的背景定向纹影（BOS）方法，该方法利用投影背景与快速棋盘解调（FCD）技术相结合，研究火花塞产生的火花传递的热量。这种方法提供了一个灵活和更合适的替代其他BOS技术分析火花点火现象，由于高分辨率的可视化（空间和时间），即使在更高的压力。利用该技术，对火花产生的温度场进行了简化校准。这项工作还演示了上述方法的使用，以获得高空间分辨率，从火花到周围不燃介质传递的热量的高速可视化，以及在11 bar绝对压力下火花与流场的相互作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.