Results 21 to 30 of about 26,791 (233)
Topology and flame speeds of turbulent premixed flame kernels in supersonic flows
Combustion and Flame, 2019 Abstract Premixed flame kernels exposed to a mean expanding supersonic channel flow are examined using experiments and large-eddy simulations. Four cases, spanning three Mach numbers and two equivalence ratios, are explored. Numerical results are processed similarly to and compared with experimental data.
Bradley A. Ochs +3 more
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IEEE Access, 2019 It has been demonstrated by a large number of studies that microwave ignition can greatly extend the lean-burn limit in the internal combustion engines. This paper investigates the influence of the pulse period and duty cycle of pulsed microwave signals ...
Zhongli Wang +5 more
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Numerical Study and Experimental Validation of Minimum Ignition Energy for Microwave Spark Ignition
IEEE Access, 2021 Microwave plasma ignition has the potential for energy savings and emission reductions, and the minimum ignition energy (MIE) and the lean limit can be determined by microwave spark plugs (MSPs) under the same microwave power. To predict the relationship
Yaoyao Wang +3 more
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Vehicles, 2022 The aim of herein work is to develop an automatized algorithm for detecting, as objectively as possible, the flame front evolution of lean/ultra-lean mixtures ignited by low temperature plasma-based ignition systems. The low luminosity characterizing the
Luca Petrucci +3 more
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Spark Ignited Turbulent Flame Kernel Growth [PDF]
, 1995 An experimental study of the effects of spark power and of incomplete fuel-air mixing on spark-ignited flame kernel growth was conducted in turbulent propane-air mixtures at 1 atm, 300K conditions. The results showed that increased spark power resulted in an increased growth rate, where the effect of short duration breakdown sparks was found to persist
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Flame and Smoke Detection Algorithm Based on ODConvBS-YOLOv5s
IEEE Access, 2023 Real-time and accurate detection of flame and smoke is an important prerequisite to reduce the loss caused by fire. There are exists some problems in traditional detection algorithms of flame and smoke, such as low accuracy, high miss rate, low detection
Jingrun Ma +4 more
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EnergiesHigh-altitude relight is a critical challenge for aero-engines, directly impacting the safety and emergency response capabilities of aircraft. This paper systematically reviews the physical mechanisms, key factors, and relevant prediction models of high ...
Yuhui Zhu +8 more
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Energies, 2023 Nowadays, an accurate and precise description of the combustion phase is essential in spark-ignition (SI) engines to drastically reduce pollutant and greenhouse gas (GHG) emissions and increase thermal efficiency.
Giovanni Gaetano Gianetti +4 more
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Energies, 2023 A combined application of step and strut was put forward to achieve reliable ignition and flame stabilization. In this work, the ignition process and temperature distribution have been tested, and a new reduction approach applied to jet fuel oxidation ...
Shilong Zhao, Hui Xiao, Yafan Li
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A direct numerical simulation of Jet A flame kernel quenching
Combustion and Flame, 2021 Abstract The safe operation of aeronautical engines requires an understanding of flame ignition, propagation and extinction. In this study, direct numerical simulations are performed using a 29 species reduced chemical mechanism for jet fuel surrogate Jet A to understand the flame quenching process. Initially laminar spherical flames of varying sizes
Alex Krisman +5 more
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