Results 11 to 20 of about 3,874 (192)

Generation and Propagation Characteristics of an Auto-Ignition Flame Kernel Caused by the Oblique Shock in a Supersonic Flow Regime

Energies, 2022
The auto-ignition caused by oblique shocks was investigated experimentally in a supersonic flow regime, with the incoming flow at a Mach number of 2.5.
Wenxiong Xi, Mengyao Xu, Chaoyang Liu, Jian Liu, Bengt Sunden   +4 more
doaj   +1 more source

Ultra-Lean Gaseous Flames in Terrestrial Gravity Conditions

Fluids, 2021
Development of the combustion process in the gaseous mixtures of near-limit composition is of great interest for fundamental aspects of combustion theory and fire-safety applications.
Ivan Yakovenko, Alexey Kiverin, Ksenia Melnikova   +2 more
doaj   +1 more source

Experimental Study of Influence on Microwave Plasma Ignition Combustion Performance of Pulse Microwave Signals

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, Yaoyao Wang, Liang Zhu, Wendong Ma, Jiafang Shan, Fukun Liu   +5 more
doaj   +1 more source

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, Reetesh Ranjan, Devesh Ranjan, Suresh Menon   +3 more
openaire   +2 more sources

The regime diagram for premixed flame kernel-vortex interactions—Revisited [PDF]

Physics of Fluids, 2010
Regimes of flame kernel-vortex (KV) interactions are investigated numerically using a detailed mechanism for hydrogen chemistry. The parametric simulations explore a wide range of conditions that are representative of conditions encountered at various degrees of turbulence intensity.
Vasudeo, Nikhil, Echekki, Tarek, Day, Marcus S., Bell, John B.   +3 more
openaire   +1 more source

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, Liang Zhu, Jianhua Wang, Jiafang Shan   +3 more
doaj   +1 more source

A Development of a New Image Analysis Technique for Detecting the Flame Front Evolution in Spark Ignition Engine under Lean Condition

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, Federico Ricci, Francesco Mariani, Gabriele Discepoli   +3 more
doaj   +1 more source

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, Zhengwei Zhang, Weien Xiao, Xinlei Zhang, Shaozhang Xiao   +4 more
doaj   +1 more source

Numerical simulation on formation process of flame kernels.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1988
The formation process of flame kernels in the ignition process by electric sparks has been investigated by using a numerical simulation, which employs unsteady two-dimensional cylindrical co-ordinate systems. In the simulation, effects of the value of the diameter of spark electrodes and the width of the spark gap on the calculated results are mainly ...
NIU, Kenichi, TSUKAMOTO, Tatsuro, UJIIE, Yasusige, KONO, Michikata   +3 more
openaire   +1 more source

A Review of Ignition Characteristics and Prediction Model of Combustor Under High-Altitude Conditions

Energies
High-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, Shaolin Wang, Kaixing Wang, Yushuai Liu, Cunxi Liu, Fuqiang Liu, Jinhu Yang, Yong Mu, Gang Xu   +8 more
doaj   +1 more source