Martin Davy
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View article: Machine learning benchmark for flow reconstruction in the TCC–III optical engine
Machine learning benchmark for flow reconstruction in the TCC–III optical engine Open
We present EngineBench, the first machine learning (ML) benchmark designed for engine in-cylinder flow research. The benchmark data consist of curated particle image velocimetry (PIV) measurements previously gathered from the Transparent C…
View article: Large eddy simulation of a supersonic lifted hydrogen flame: Impacts of Lewis, turbulent Schmidt and Prandtl numbers
Large eddy simulation of a supersonic lifted hydrogen flame: Impacts of Lewis, turbulent Schmidt and Prandtl numbers Open
Parametric large eddy simulations (LES) of a supersonic lifted hydrogen flame are reported. The emphases are on two aspects: impacts of (1) Lewis number (Lei of the ith species) and (2) turbulent Schmidt and Prandtl numbers (Sct and Prt) o…
View article: Development of a semi-empirical physical model for transient NO<sub>x</sub> emissions prediction from a high-speed diesel engine
Development of a semi-empirical physical model for transient NO<sub>x</sub> emissions prediction from a high-speed diesel engine Open
With emissions regulations becoming increasingly restrictive and the advent of real driving emissions limits, control of engine-out NO x emissions remains an important research topic for diesel engines. Progress in experimental engine deve…
View article: EngineBench: Flow Reconstruction in the Transparent Combustion Chamber III Optical Engine
EngineBench: Flow Reconstruction in the Transparent Combustion Chamber III Optical Engine Open
We present EngineBench, the first machine learning (ML) oriented database to use high quality experimental data for the study of turbulent flows inside combustion machinery. Prior datasets for ML in fluid mechanics are synthetic or use ove…
View article: Extracting vector magnitudes of dominant structures in a cyclic engine flow with dimensionality reduction
Extracting vector magnitudes of dominant structures in a cyclic engine flow with dimensionality reduction Open
In fluid mechanics research, data gathered from measurements and simulations may be challenging to interpret due to complexities such as transience, non-linearity, and high dimensionality. Velocity data from the airflow through an internal…
View article: Conditional space evaluation of progress variable definitions for Cambridge/Sandia swirl flames
Conditional space evaluation of progress variable definitions for Cambridge/Sandia swirl flames Open
Data from all spatial locations of nine turbulent flames in the Cambridge/Sandia swirl database are combined to study how the choice of scalar variables in conditional moment closure (CMC) type approaches affect the conditional spatial flu…
View article: Dynamic Mode Decomposition for the Comparison of Engine In-Cylinder Flow Fields from Particle Image Velocimetry (PIV) and Reynolds-Averaged Navier–Stokes (RANS) Simulations
Dynamic Mode Decomposition for the Comparison of Engine In-Cylinder Flow Fields from Particle Image Velocimetry (PIV) and Reynolds-Averaged Navier–Stokes (RANS) Simulations Open
Validation of Reynolds-averaged Navier–Stokes (RANS) simulation results against experimental data such as flow measurements from particle image velocimetry (PIV) remains a challenge for the development of thermal propulsion systems. This i…
View article: Prospects of Controlled Auto-Ignition Based Thermal Propulsion Units for Modern Gasoline Vehicles
Prospects of Controlled Auto-Ignition Based Thermal Propulsion Units for Modern Gasoline Vehicles Open
Gasoline engines employing the spatially distributed auto-ignition combustion mode, known as controlled auto-ignition (CAI), are a prospective technology for significantly improving engine efficiency and reducing emissions. This review pap…
View article: Flame acceleration and transition to detonation in a pre-/main-chamber combustion system
Flame acceleration and transition to detonation in a pre-/main-chamber combustion system Open
Numerical simulations are performed to study the mechanism of deflagration to detonation transition (DDT) in a pre-/main-chamber combustion system with a stoichiometric ethylene–oxygen mixture. A Godunov algorithm, fifth-order in space, an…
View article: Effect of ethanol addition on the laminar burning velocities of gasoline surrogates
Effect of ethanol addition on the laminar burning velocities of gasoline surrogates Open
Laminar burning velocities (LBV) and Markstein lengths of spherical flames of n-heptane (H), iso-octane (O), and ethanol (E) and their binary and ternary mixtures (in equal volume fractions) at elevated pressures and temperatures are exper…
View article: Manifold reduction techniques for the comparison of crank angle-resolved particle image velocimetry (PIV) data and Reynolds-averaged Navier-Stokes (RANS) simulations in a spark ignition direct injection (SIDI) engine
Manifold reduction techniques for the comparison of crank angle-resolved particle image velocimetry (PIV) data and Reynolds-averaged Navier-Stokes (RANS) simulations in a spark ignition direct injection (SIDI) engine Open
In this article, different manifold reduction techniques are implemented for the post-processing of Particle Image Velocimetry (PIV) images from a Spark Ignition Direct Injection (SIDI) engine. The methods are proposed to help make a more …
View article: Artificial neural network (ANN) assisted prediction of transient NO<sub>x</sub> emissions from a high-speed direct injection (HSDI) diesel engine
Artificial neural network (ANN) assisted prediction of transient NO<sub>x</sub> emissions from a high-speed direct injection (HSDI) diesel engine Open
The understanding and prediction of NO x emissions formation mechanisms during engine transients are critical to the monitoring of real driving emissions. While many studies focus on the engine out NO x formation and treatment, few studies…
View article: Effect of Liquid Break-Up Model Selection on Simulated Diesel Spray and Combustion Characteristics
Effect of Liquid Break-Up Model Selection on Simulated Diesel Spray and Combustion Characteristics Open
Accurate modelling for spray vapour fields is critical to enable adequate predictions of spray ignition and combustion characteristics of non-premixed reacting diesel sprays. Spray vapour characteristics are in turn controlled by liquid at…
View article: Parametric Studies of a Novel Combustion Modelling Approach for Low Temperature Diesel Spray Simulation
Parametric Studies of a Novel Combustion Modelling Approach for Low Temperature Diesel Spray Simulation Open
Conditional Source-term Estimation (CSE) is a combustion model based on the conditional moment hypothesis where transport equations for reactive species are conditionally averaged on conserved scalars. Major advantages of this strategy are…
View article: On the application of artificial neural networks for the prediction of NO<sub><i>x</i></sub> emissions from a high-speed direct injection diesel engine
On the application of artificial neural networks for the prediction of NO<sub><i>x</i></sub> emissions from a high-speed direct injection diesel engine Open
This article considers the application and refinement of artificial neural network methods for the prediction of NO x emissions from a high-speed direct injection diesel engine over a wide range of engine operating conditions. The relative…
View article: Improving the Uncertainty of Exhaust Gas Temperature Measurements in Internal Combustion Engines
Improving the Uncertainty of Exhaust Gas Temperature Measurements in Internal Combustion Engines Open
Accurate measurement of exhaust gas temperature (EGT) in internal combustion engines (ICEs) is a challenging task. The most common, and also the most practical, method of measurement is to insert a physical probe, for example, a thermocoup…
View article: Spray development with in-cylinder pressure and particulate matter measurements in a GDI engine with optical access: Effects of fuel volatility
Spray development with in-cylinder pressure and particulate matter measurements in a GDI engine with optical access: Effects of fuel volatility Open
Particulate matter emissions are subject to legislation and can occur at significantly higher levels with Gasoline Direct Injection (GDI) engines than Port Fuel Injection (PFI) engines. This has to be linked to mixture preparation for whic…
View article: On the Prediction of Spray A End of Injection Phenomenon Using Conditional Source-Term Estimation
On the Prediction of Spray A End of Injection Phenomenon Using Conditional Source-Term Estimation Open
International audience
View article: The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine
The Effect of an Active Thermal Coating on Efficiency and Emissions from a High Speed Direct Injection Diesel Engine Open
This study looked into the application of active thermal coatings on the surfaces of the combustion chamber as a method of improving the thermal efficiency of internal combustion engines. The active thermal coating was applied to a product…
View article: Development of Cortical Integration of Visual Stimuli in Very Preterm Infants
Development of Cortical Integration of Visual Stimuli in Very Preterm Infants Open
Very preterm infants (VPI) are exposed to atypical visual stimuli in the hospital. They are able to exhibit physiological and behavioural responses to ecological visual stimuli in the NICU from 28 weeks post-menstrual age (PMA).1,2 However…
View article: Even Moderate Visual Stimuli Leads to Behavioural Responses in Term and Preterm Infants
Even Moderate Visual Stimuli Leads to Behavioural Responses in Term and Preterm Infants Open
Very preterm infants (VPI) are exposed to atypical visual stimuli in the hospital. Their visual system was shown to be mature enough to allow them to physiologically react to ecological visual stimuli in the NICU from 28 weeks post-menstru…
View article: A Study on Kinetic Mechanisms of Diesel Fuel Surrogate n-Dodecane for the Simulation of Combustion Recession
A Study on Kinetic Mechanisms of Diesel Fuel Surrogate n-Dodecane for the Simulation of Combustion Recession Open
Combustion recession, an end of injection (EOI) diesel spray phenomenon, has been found to be a robust correlation parameter for UHC in diesel LTC strategies. Previous studies have shown that the likelihood of capturing combustion recessio…
View article: Temperature measurements under diesel engine conditions using laser induced grating spectroscopy
Temperature measurements under diesel engine conditions using laser induced grating spectroscopy Open
Crank angle-resolved temperatures have been measured using laser induced grating spectroscopy (LIGS) in a motored reciprocating compression machine to simulate diesel engine operating conditions. A portable LIGS system based on a pulsed Nd…
View article: Effect of Thermocouple Size on the Measurement of Exhaust Gas Temperature in Internal Combustion Engines
Effect of Thermocouple Size on the Measurement of Exhaust Gas Temperature in Internal Combustion Engines Open
Accurate measurement of exhaust gas temperature in internal combustion engines is essential for a wide variety of monitoring and design purposes. Typically these measurements are made with thermocouples, which may vary in size from 0.05 mm…