Optical Engines as Representative Tools in the Development of New Combustion Engine Concepts
Julian Kashdan,Benoist Thirouard +1 more
TLDR
In this article, the principal differences between optical and all-metal engines and understand how these differences ultimately affect mixing, combustion and emissions formation processes were investigated, revealing the significant impact of differences in combustion chamber wall temperatures between optical engines and standard engine piston bowls on combustion phasing and engine-out emissions.Abstract:
Single cylinder optical engines are used for Internal Combustion (IC) engine research as they allow for the application of qualitative and quantitative non-intrusive, diagnostic techniques to study in-cylinder flow, mixing, combustion and emissions phenomena Such experimental data is not only important for the validation of computational models but can also provide a detailed insight into the physical processes occurring in-cylinder which is useful for the further development of new combustion strategies such as gasoline Homogeneous Charge Compression Ignition (HCCI) and Diesel Low Temperature Combustion (LTC) In this context, it is therefore important to ensure that the performance of optical engines is comparable to standard all-metal engines A comparison of optical and all-metal engine combustion and emissions performance was performed within the present study The objective was to investigate the principal differences between optical and all-metal engines and understand how these differences ultimately affect mixing, combustion and emissions formation processes Experimental results reveal the significant impact of differences in combustion chamber wall temperatures between optical and standard engine piston bowls on combustion phasing and engine-out emissions Quantitative measurements of piston wall temperatures using a laser-induced phosphorescence technique were performed which allowed the subsequent definition of appropriate engine operating strategies so as to compensate for differences in heat transfer properties Furthermore, differences in combustion chamber geometry were also studied Geometrical differences can arise as a result of dynamic (compressive/tensile) and thermal loading of the extended piston-liner assembly on the optical engine, potentially leading to changes in the effective Compression Ratio In addition, intake charge dilution in optical engines is often achieved via the use of simulated Exhaust Gas Recirculation (EGR) A comparison has been made between simulated EGR (using pure nitrogen) with real EGR under Diesel LTC conditions Finally, “pure”, single component fuels are often employed in optical Diesel engines due to laser diagnostic constraints However, these fuels generally differ from standard Diesel fuel in terms of cetane number and fuel volatility which can significantly influence the combustion and emissions characteristics in optical engines These aspects have also been investigated within the present studyAn improved understanding of the differences between optical and all-metal engines has allowed us to develop appropriate strategies to compensate for these differences on the optical engine It is shown here that combustion phasing (and engine-out emissions) matching between optical and all-metal engines can be achieved even for advanced LTC Diesel combustion strategies The ability to ensure fully representative combustion and emissions behaviour of optical engines ultimately increases the value of optical engine data, highlighting the importance of using such engines as research tools for the further development of innovative, low emission combustion conceptsread more
Citations
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Applications of Luminescence Thermometry in Engineering
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References
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Journal ArticleDOI
Remote thermometry with thermographic phosphors: Instrumentation and applications
TL;DR: The temperature-dependent characteristics of fluorescence of several rare-earth-doped ceramic phosphors has made these materials the focus of a major effort in the field of noncontact thermometry over the past few decades as mentioned in this paper.
Journal ArticleDOI
Spectroscopic and chemical-kinetic analysis of the phases of HCCI autoignition and combustion for single- and two-stage ignition fuels
TL;DR: In this paper, the temporal phases of autoignition and combustion in an HCCI engine have been investigated in both an all-metal engine and a matching optical engine, and the results indicated that the CO+O{yields}CO{sub 2}+h{nu} reaction responsible for the CO continuum emission tracks the HTHR well, explaining the strong correlation observed experimentally between the total chemiluminescence and HRR during the H THR phase.
Journal ArticleDOI
High-temperature phosphor thermometry of rotating turbine blades
TL;DR: In this paper, a remote temperature sensing using thermal phosphors is developed as a nonintrusive technique for monitoring and analyzing the high-temperature, highly corrosive environments of turbomachinery.
Proceedings ArticleDOI
On the origin of Unburned Hydrocarbon Emissions in a Wall Guided, Low NOx Diesel Combustion System
Journal ArticleDOI
A Detailed Comparison of Emissions and Combustion Performance Between Optical and Metal Single-Cylinder Diesel Engines at Low Temperature Combustion Conditions
Will F. Colban,Duksang Kim,Paul C. Miles,Seungmook Oh,Richard Opat,Roger Krieger,David E. Foster,Russell P. Durrett,A. Manuel,D. Gonzalez +9 more
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