Evolution, Trends and Applications of Endoscopy in Internal Combustion Engines

Remarkable progress has been achieved in measuring the flame propagation rate accurately under laminar conditions, which can be used to predict turbulent flame propagation rates using some correlations fitted to experimental data. However, such propagation rates, unlike the laminar case, cannot be unambiguously determined. Nevertheless, the advancement of laser imaging techniques has led to several definitions of turbulent burning rates (Roshan et al., 2010, “Simulation of Global Warming Effect on Outdoor Thermal Comfort Conditions,” Int. J. Environ. Sci. Technol., 7(3), pp. 571–580). Recently, a unified scaling factor has been successfully demonstrated using data gathered from several fan-stirred bombs. Such results are promising in compiling a comprehensive database of turbulent propagation rates for potential and common fuels of interest to internal combustion engines (ICEs) and gas turbines alike. The strict worldwide legislation to reduce emissions has forced many industries to look into alternative fuels with less emissions. One such alternative fuel that has gained much interest recently is the gas-to-liquid (GTL) fuel, which is being used in blended forms in several combustion applications. However, detailed combustion characteristic investigations are required before using this new alternative fuel widely in engines (Business, 2018, “Qatar’s Exporters Directory 2018”). In this study, the significant issues associated with the use of fan-stirred bombs are investigated. First, the effect of varying fan speed and geometry is reviewed, and then, the measurement techniques that are commonly used to track flame propagation are discussed. This is followed by the study of the effect of using different types of fuels on combustion characteristics. Furthermore, the use of diesel and gasoline optical engine setups as advanced flame visualization tools have been reviewed extensively.

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Combustion Visualization in Commercial Engines Operating with Diesel-Biodiesel Blend

Ferreira,

Moreira,

Borges

et al. 2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">The Brazilian government encourages the use of renewable fuels in diesel engines through resolutions that define the mandatory addition of biodiesel to automotive diesel oil. The use of biodiesel will reach 15% by 2026. Due to this change in the physicochemical characteristics of commercial fuel, there is a need to deepen studies regarding the combustion process and the effects of this change on engine performance and emissions. With technological advancements, one of the viable techniques for this purpose is high-speed imaging to assess combustion within the cylinder. This paper presents the methodology for constructing a system that allows high-speed imaging, using a high-speed camera, of the combustion process of an MWM 229/4 engine. Other studies published in this area typically involve capturing images inside the cylinder once per cycle and advancing the angular position of capture each cycle. This paper proposes a more refined method, where images are acquired every 2.5°CA, allowing for the observation of a sequence of images from the same cycle. As a result, the images captured in one of the cylinders are presented, in which one can observe the evolution of combustion synchronized with the in-cylinder pressure curve.</div></div>

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Evolution, Trends and Applications of Endoscopy in Internal Combustion Engines

Cited by 3 publications

References 41 publications

Study on the effect of 2-butoxyethanol as an additive on the combustion flame, performance and emission characteristics of a spark ignition engine

Study on the effect of 2-butoxyethanol as an additive on the combustion flame, performance and emission characteristics of a spark ignition engine

Turbulent Flames in Enclosed Combustion Chambers: Characteristics and Visualization—A Review

Combustion Visualization in Commercial Engines Operating with Diesel-Biodiesel Blend

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