Evaluation of non-ideal piston stopping effects on the “adiabatic core” and ignition delay time simulation in rapid compression machines

2020 ◽  
Vol 218 ◽  
pp. 229-233
Author(s):  
Yingtao Wu ◽  
Chenglong Tang ◽  
Meng Yang ◽  
Quan-de Wang ◽  
Zuohua Huang ◽  
...  
Keyword(s):  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Time Simulation ◽  
Rapid Compression

scholarly journals The Impact of NOx Addition on the Ignition Behavior of N-Pentane

2021 ◽  
Author(s):  
Mark Edward Fuller ◽  
Philipp Morsch ◽  
Franklin Goldsmith ◽  
Karl Alexander Heufer
Keyword(s):  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Kinetic Mechanism ◽  
Chemical Kinetic ◽  
Rapid Compression Machine ◽  
Chemical Kinetic Mechanism ◽  
Rapid Compression ◽  
The Impact

This article details new ignition delay time experiments carried out on blends of n-pentane and either NO or NO<sub>2</sub> in the rapid compression machine facility at RWTH Aachen University. Further, a new chemical kinetic mechanism is developed which is able to well-reproduce the experiments and significantly improve over recently published mechanisms. <br>This work has particular value for publication as it adopts a systematic, class-based approach to mechanism development for interactions with nitrogenated species. <br>

scholarly journals The Impact of NOx Addition on the Ignition Behavior of N-Pentane

2021 ◽  
Author(s):  
Mark Edward Fuller ◽  
Philipp Morsch ◽  
Franklin Goldsmith ◽  
Karl Alexander Heufer
Keyword(s):  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Kinetic Mechanism ◽  
Chemical Kinetic ◽  
Rapid Compression Machine ◽  
Chemical Kinetic Mechanism ◽  
Rapid Compression ◽  
The Impact

This article details new ignition delay time experiments carried out on blends of n-pentane and either NO or NO<sub>2</sub> in the rapid compression machine facility at RWTH Aachen University. Further, a new chemical kinetic mechanism is developed which is able to well-reproduce the experiments and significantly improve over recently published mechanisms. <br>This work has particular value for publication as it adopts a systematic, class-based approach to mechanism development for interactions with nitrogenated species. <br>

Rate-Controlled Constrained-Equilibrium Application in Shock Tube Ignition Delay Time Simulation

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Guangying Yu ◽  
Fatemeh Hadi ◽  
Hameed Metghalchi
Keyword(s):  
Equilibrium State ◽  
Shock Tube ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Wave Attenuation ◽  
Thermodynamic Quantities ◽  
Time Simulation ◽  
Constrained Equilibrium ◽  
Rate Controlled

The rate-controlled constrained-equilibrium (RCCE), a model order reduction method, assumes that the nonequilibrium states of a system can be described by a sequence of constrained-equilibrium kinetically controlled by relatively a small number of constraints within acceptable accuracies. The full chemical composition at each constrained-equilibrium state is obtained by maximizing (or minimizing) the appropriate thermodynamic quantities, e.g., entropy (or Gibbs functions) subject to the instantaneous values of the constraints. Regardless of the nature of the kinetic constraints, RCCE always guarantees correct final equilibrium state. Ignition delay times measured in shock tube experiments with low initial temperatures are significantly shorter than the values obtained by constant volume models. Low initial temperatures and thus longer shock tube test times cause nonideal heat transfer and fluid flow effects such as boundary layer growth and shock wave attenuation to gradually increase the pressure (and simultaneously increase the temperature) before ignition. To account for these effects, in this paper, the RCCE prescribed enthalpy and pressure (prescribed h/p) model has been further developed and has been applied to methane shock tube ignition delay time simulation using GRI-Mech 3.0. Excellent agreement between RCCE predictions and shock tube experimental data was achieved.

A Study on the Autoignition Characteristics of Gasoline-Biodiesel Blended Fuel Using a Rapid Compression Expansion Machine

2019 ◽  
Author(s):  
Kyeonghun Jwa ◽  
JinWoo Lee ◽  
Ocktaeck Lim
Keyword(s):  
Compression Ratio ◽  
Ignition Delay ◽  
Delay Time ◽  
Ignition Delay Time ◽  
Fuel Injection ◽  
Spontaneous Ignition ◽  
Injection Timing ◽  
Blended Fuel ◽  
Rapid Compression ◽  
Ignition Characteristics

Abstract In this study, the problem of GCI method at low intake air temperature was solved by using gasoline-biodiesel blended fuel. Autoignition characteristics of gasoline-biodiesel blended fuel was analyzed using a rapid compression expansion machine. Gasoline-biodiesel blended fuel was mixed 20% of biodiesel with gasoline volume and spontaneous ignition characteristics were analyzed according to fuel injection timing and compression ratio. Firstly, this study investigated spontaneous ignition characteristics of gasoline-biodiesel blended fuel according to the injection timing. A compression ratio was fixed at 12, and the injection timing was delayed from −49° CA ATDC to 0° CA ATDC. The ignition delay time of the mixed fuel was decreased and the IMEP was increased as the injection timing was delayed until −10° CA ATDC. However, the ignition delay time and IMEP subtly changed when the injecting was near TDC. To investigate the auto-ignition characteristics of the gasoline-biodiesel blended fuel according to the compression ratio, the experiment tested at 10, 12, 14, and 16. At that time, the injection timing was set to −33° CA ATDC, −20° CA ATDC, −10° CA ATDC, and −0° CA ATDC. The ignition delay tended to be shorter as the injection timing was delayed at all compression ratios but IMEP calculated at CR10, 16 is good at only specific injection periods. At the compression ratios 12 and 14, the most extensive range of IMEP results were obtained.

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