Journal ArticleDOI
Analysis of mild ignition in a shock tube using a highly resolved 3D-LES and high-order shock-capturing schemes
Reads0
Chats0
TLDR
In this article, a high-order interpolation scheme was used to solve the conservation equations of the viscous, compressible fluid and to account for turbulence behind the reflected shock.Abstract:
A highly resolved three-dimensional large-eddy simulation (LES) is presented for a shock tube containing a stoichiometric hydrogen–oxygen (
$$\hbox {H}_2$$
/
$$\hbox {O}_2$$
) mixture, and the results are compared against experimental results. A parametric study is conducted to test the effects of grid resolution, numerical scheme, and initial conditions before the 3D simulations are presented in detail. An approximate Riemann solver and a high-order interpolation scheme are used to solve the conservation equations of the viscous, compressible fluid and to account for turbulence behind the reflected shock. Chemical source terms are calculated by a finite-rate model. Simultaneous results of pseudo-Schlieren, temperature, pressure, and species are presented. The ignition delay time is predicted in agreement with the experiments by the three-dimensional simulations. The mechanism of mild ignition is analysed by Lagrangian tracer particles, tracking temperature histories of material particles. We observed strongly increased temperatures in the core region away from the end wall, explaining the very early occurrence of mild ignition in this case.read more
Citations
More filters
Journal ArticleDOI
Combustion machine learning: Principles, progress and prospects
TL;DR: A review of data sources, data-driven techniques, and concepts for combustion machine learning can be found in this article , focusing on interpretability, uncertainty quantification, robustness, consistency, creation and curation of benchmark data, and the augmentation of ML methods with prior combustion domain knowledge.
Journal ArticleDOI
High-pressure shock tube study of ethanol oxidation: Ignition delay time and CO time-history measurements
Andrew Laich,Erik Ninnemann,Sneha Neupane,Ramees K. Rahman,Samuel Barak,William J. Pitz,S. Scott Goldsborough,Subith Vasu +7 more
TL;DR: In this article, Zhang et al. measured CO time-histories and ignition delay times behind reflected shockwaves at elevated pressure and showed that the transition from mild to strong ignition can be interpreted as a transition from strong ignition.
Journal ArticleDOI
Influence of the chemical modeling on the quenching limits of gaseous detonation waves confined by an inert layer
TL;DR: In this article, the effect of chemistry modeling on the flow structure and quenching limits of detonations propagating into reactive layers bounded by an inert gas is investigated numerically, and three different kinetic schemes of increasing complexity are used to model a stoichiometric H2-O2 mixture.
Journal ArticleDOI
Reflected shock-initiated ignition probed via simultaneous lateral and endwall high-speed imaging with a transparent, cylindrical test-section
Erik Ninnemann,Owen Pryor,Samuel Barak,Sneha Neupane,Sneha Neupane,Zachary Loparo,Andrew Laich,Subith Vasu +7 more
TL;DR: In this paper, a TRAnsparent cylindrical (TRAC) test section has been developed to explore the ignition structure behind reflected shockwaves via simultaneous lateral and endwall high-speed imaging using three fuel/oxidizer mixtures: 0.1% n-C7H16/1.14% N2/94.66% Ar, 0.5% CH4/10% O2/85% CO2.
Journal ArticleDOI
Modes of mild ignition in shock tubes: Origins and classification
TL;DR: In this paper, three modes of mild ignition are distinguished among which are: ignition related to the shear heating in the developed boundary layer, ignition due to the recirculation zone behind the reflected shock and ignition in the central region of the tube due to axial compression.
References
More filters
Journal ArticleDOI
SUNDIALS: Suite of nonlinear and differential/algebraic equation solvers
Alan C. Hindmarsh,Peter Brown,K. E. Grant,Steven L. Lee,Radu Serban,Dan E. Shumaker,Carol S. Woodward +6 more
TL;DR: The current capabilities of the codes, along with some of the algorithms and heuristics used to achieve efficiency and robustness, are described.
Posted Content
Enabling New Flexibility in the SUNDIALS Suite of Nonlinear and Differential/Algebraic Equation Solvers.
TL;DR: The SUNDIALS suite of nonlinear and DIfferential/ALgebraic equation solvers (SUNDIALs) as mentioned in this paper has been redesigned to better enable the use of application-specific and third-party algebraic solvers and data structures.
Journal ArticleDOI
Low-storage Runge-Kutta schemes
TL;DR: All second-order, many third- order, and a few fourth-order Runge-Kutta schemes can be arranged to require only two storage locations per variable, compared with three needed by Gill's method.
Journal ArticleDOI
A comprehensive modeling study of hydrogen oxidation
TL;DR: A detailed kinetic mechanism has been developed to simulate the combustion of H2/O2 mixtures, over a wide range of temperatures, pressures, and equivalence ratios as discussed by the authors.
Related Papers (5)
Visualization study of ignition modes behind bifurcated-reflected shock waves
Weak and strong ignition of hydrogen/oxygen mixtures in shock-tube systems
Kevin Grogan,Matthias Ihme +1 more