Author
G. Woschni
Bio: G. Woschni is an academic researcher from Augsburg College. The author has contributed to research in topics: Thermal science & Heat transfer coefficient. The author has an hindex of 1, co-authored 1 publications receiving 1912 citations.
Papers
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2,050 citations
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TL;DR: A comprehensive overview of hydrogen-fueled internal combustion engines (H 2 ICEs) can be found in this paper, where the authors discuss the fundamentals of the combustion of hydrogen, details on the different mixture formation strategies and their emissions characteristics, measures to convert existing vehicles, dedicated hydrogen engine features, a state of the art on increasing power output and efficiency while controlling emissions and modeling.
743 citations
29 Jul 2014
TL;DR: The types of sensors reviewed in this chapter are (1) room-temperature hydrogen leak sensors; (2) thermometers, particularly useful at low temperature; (3) liquid hydrogen volume and mass gauges; and (4) para/ortho hydrogen ratiometers as mentioned in this paper.
Abstract: Four types of hydrogen detectors are used by researchers, engineers, and manufacturers
today, and if hydrogen continues to play a role in emerging alternative energy sources,
there will be exponential growth in the use and need for more advanced and more robust
devices in the future. The types of sensors reviewed in this chapter are (1) room-temperature hydrogen leak sensors; (2) thermometers, particularly useful at low temperature;
(3) liquid hydrogen volume and mass gauges; and (4) para/ortho hydrogen ratiometers.
631 citations
TL;DR: A comprehensive review of the physical phenomena governing homogeneous charge compression ignition (HCCI) operation, with particular emphasis on high load conditions, is provided in this paper, with suggestions on how to inexpensively enable low emissions of all regulated emissions.
481 citations
TL;DR: In this article, a heat release model using a one zone description of the cylinder contents with thermodynamic properties represented by a linear approximation is presented. But the model does not consider the effects of heat transfer, crevice flows and fuel injection.
Abstract: In analyzing the processes inside the cylinder of an internal combustion engine, the principal diagnostic at the experimenter's disposal is a measured time history of the cylinder pressure. This paper develops, tests, and applies a heat release analysis procedure that maintains simplicity while including the effects of heat transfer, crevice flows and fuel injection. The heat release model uses a one zone description of the cylinder contents with thermodynamic properties represented by a linear approximation. Applications of the analysis to a single-cylinder spark-ignition engine, a special square cross-section visualization spark-ignition engine, and a direct-injection stratified charge engine are presented.
450 citations
TL;DR: In this article, an experimental study has been carried out to provide qualitative and quantitative insight into gas to wall heat transfer in a gasoline fueled homogeneous charge compression Ignition (HCCI) engine.
Abstract: An experimental study has been carried out to provide qualitative and quantitative insight into gas to wall heat transfer in a gasoline fueled Homogeneous Charge Compression Ignition (HCCI) engine. Fast response thermocouples are embedded in the piston top and cylinder head surface to measure instantaneous wall temperature and heat flux. Heat flux measurements obtained at multiple locations show small spatial variations, thus confirming relative uniformity of incylinder conditions in a HCCI engine operating with premixed charge. Consequently, the spatially-averaged heat flux represents well the global heat transfer from the gas to the combustion chamber walls in the premixed HCCI engine, as confirmed through the gross heat release analysis. Heat flux measurements were used for assessing several existing heat transfer correlations. One of the most popular models, the Woschni expression, was shown to be inadequate for the HCCI engine. The problem is traced back to the flame propagation term which is not appropriate for the HCCI combustion. Subsequently, a modified model is proposed which significantly improves the prediction of heat transfer in a gasoline HCCI engine and shows very good agreement over a range of conditions.
439 citations