Results 171 to 180 of about 22,653 (192)

Intrinsic Instability of Three-Dimensional Premixed Flames Under Low- and High-Temperature Conditions: Effects of Unburned-Gas Temperature on Hydrodynamic and Diffusive-Thermal Instabilities

Combustion Science and Technology, 2015
The intrinsic instability of three-dimensional (3D) premixed flames under low- and high-temperature conditions was numerically treated to study the effects of unburned-gas temperature on hydrodynamic and diffusive-thermal instabilities. Superimposing a sinusoidal disturbance with sufficiently small amplitude on a planar flame, we obtained the relation ...
Satoshi Kadowaki, Takuto Yanagioka, Wataru Yamazaki, Hideaki Kobayashi   +3 more
openaire   +3 more sources

Unburned gas temperature measurements in a surrogate Diesel jet via two-color toluene-LIF imaging

Proceedings of the Combustion Institute, 2011
Abstract Non-intrusive temperature measurements of the unburned fuel/air mixture in vaporized Diesel jets have been performed using two-color toluene laser-induced fluorescence (LIF). This diagnostics technique exploits the temperature-dependent spectral shift of the LIF signal which occurs after ultraviolet (UV) excitation of toluene that is added ...
Tea, Gabrielle, Bruneaux, Gilles, Kashdan, Julian T., Schulz, Christof   +3 more
openaire   +3 more sources

The effects of spark timing, unburned gas temperature, and negative valve overlap on the rates of stoichiometric spark assisted compression ignition combustion

Applied Energy, 2013
Abstract Spark assisted compression ignition (SACI) combustion is a potential means of extending the high load limit of homogeneous charge compression ignition (HCCI) while maintaining high thermal efficiency. In these experiments, an HCCI engine equipped with fully-flexible valve actuation was used to explore the effect of spark assist in ...
Laura Manofsky Olesky, Jason B. Martz, George A. Lavoie, Jiri Vavra, Dennis N. Assanis, Aristotelis Babajimopoulos   +5 more
openaire   +3 more sources

Distortion of expanding n-heptane flames at high unburned-gas temperatures behind reflected shocks

Combustion and Flame, 2022
Abstract Simultaneous, dual-perspective, high-speed imaging is used to provide new insight into the morphology of flames generated at high unburned-gas temperatures behind reflected shock waves. Single-perspective, end-wall imaging left previous applications of the shock-tube flame speed method reliant on an assumption of axial symmetry when ...
Adam J. Susa, Ronald K. Hanson
openaire   +1 more source

Unburned Gas Temperatures in an Internal Combustion Engine. II:Heat Release Computations

Combustion Science and Technology, 1987
Abstract A heat release model has been developed and applied to predict unburned gas temperature histories in both a knocking and a non-knocking engine.The model advances the state of the art in its treatment of boundary layers and by its formulation which uses algebraic equations of state instead of differential equations.
Colin R. Ferguson, Robert M. Green, Robert P. Lucht   +2 more
openaire   +1 more source

In-situ Unburned Gas Temperature Measurement in a Spark Ignition Engine Using Laser Interferometry

SAE Technical Paper Series, 2005
<div class="htmlview paragraph">A heterodyne interferometry system with a fiber-optic sensor was developed to measure the temperature history of unburned gas in a spark-ignition engine. A polarization-preserving fiber and metal mirror were used as the fiber-optic sensor to deliver the test beam to and from the measurement region. This fiber-optic
Nobuyuki Kawahara, Eiji Tomita, Kenji Ohnishi, Kazuhiro Goto   +3 more
openaire   +1 more source

Unburned gas temperature measurement in a spark-ignition engine using fibre-optic heterodyne interferometry

Measurement Science and Technology, 2001
A fibre-optic heterodyne interferometry system was developed to obtain the temperature histories of an unburned mixture with high temporal resolution non-intrusively. In laser interferometry, the effective optical path length of the test beam changes with the gas density and corresponding changes of the refractive index.
Nobuyuki Kawahara, Eiji Tomita, Hiroshi Kamakura   +2 more
openaire   +1 more source

2-D Temperature Measurements of Unburned Gas Mixture in an Engine by Two-line Excitation LIF Technique

SAE Technical Paper Series, 2006
<div class="htmlview paragraph">Two-line excitation LIF (Laser-Induced Fluorescence) technique for 2-dimensional temperature measurements in an engine cylinder before ignition is presented. From the fundamental examinations, the combination of toluene tracer with a pair of excitation lines of 248nm and 266nm has been selected because of the high ...
Taketoshi Fujikawa, Kenji Fukui, Yoshiaki Hattori, Kazuhiro Akihama   +3 more
openaire   +1 more source

Measurement of the temperature history of unburned gas before knocking in a spark-ignition engine using laser interferometry

Measurement Science and Technology, 2000
It is very important to know the temperature history in a spark-ignition engine when the phenomenon of knocking is being studied. However, measurement of the gas temperature is not easy and some work has been done using laser diagnostics etc. In this study, the temperature history until the time of occurrence of knocking in a spark-ignition engine was ...
Eiji Tomita, Yoshisuke Hamamoto, Dongmin Jiang   +2 more
openaire   +1 more source

Transient Temperature Measurement of Unburned Gas in an Engine Cylinder Using Laser Interferometry with a Fiber-Optic Sensor

SAE Technical Paper Series, 2003
<div class="htmlview paragraph">A heterodyne interferometry system with a fiber-optic sensor was developed to measure the temperature history of unburned gas in an engine cylinder. A polarization-preserving fiber and metal mirror were used as the fiber-optic sensor to deliver the test beam to and from the measurement region.
Nobuyuki Kawahara, Eiji Tomita, Mitsuru Ichimiya, Kouji Takasu, Naoki Tsuchida, Kazuhiro Goto   +5 more
openaire   +1 more source