Guillaume De SerceyUniversity of Brighton · School of Computing, Engineering and Mathematics
Guillaume De Sercey
Ph.D
About
27
Publications
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251
Citations
Citations since 2017
Publications
Publications (27)
Computational Fluid Dynamics (CFD) frameworks of supercritical cryogenic fluids need to employ Real Fluid models such as cubic Equations of State (EoS) to account for thermal and inertial driven mechanisms of fluid evolution and disintegration. Accurate estimation of the non-linear variation in density, thermodynamic and transport properties is req...
Advancements in novel high efficiency IC engines, cryogenic rocket engines and cooling technologies have given rise to the need for accurate simulation capabilities of cryogenic jets. The ability to accurately simulate cryogenic jets will be pivotal in controlling the jet penetration and/or heat absorption depending upon the role of cryogenic fluid...
Cryogenic supercritical fluids represent an intriguing category of fluids that combine mechanical and thermophysical properties of both ultralow temperature conditions and phenomena taking place well above the critical point. Recent research has demonstrated that it is a common misconception to consider the supercritical state as one homogeneous st...
In this work air fuel mixing and combustion dynamics in the recuperated split cycle engine (RSCE) are investigated through new theoretical analysis and complementary optical experiments of the flow field. First, a brief introduction to the basic working principles of the RSCE cycle will be presented, followed by recent test bed results relevant to...
In this paper we provide insight into the thermophysical properties and the dynamics of cryogenic jets. The motivation of the work is to optimise the use of cryogenic fluids in novel ultra low emission engines. For demonstration, we use conditions relevant to an internal combustion engine currently being developed by Dolphin N2 and the University o...
![Figure 1. Schematic of a Split Cycle Engine by Ricardo[6] with T-S...](profile/Jaya-Vignesh-Madana-Gopal/publication/362265800/figure/fig1/AS:1182117757231110@1658850244881/Schematic-of-a-Split-Cycle-Engine-by-Ricardo6-with-T-S-diagram-of-a-RCSE-compared-to-a_Q320.jpg)
In this paper we present the basic concepts of operations of a hybrid liquid nitrogen and internal combustion engine currently under development by Ricardo Innovations, Dolphin N2 and the University of Brighton, the CryoPower recuperated split cycle engine (RSCE). The engine is based on a new split-cycle combustion concept utilising isothermal comp...
In a fuel injector at the end of the injection, the needle descent and the rapid pressure drop in the nozzle leads todischarge of large, slow-moving liquid structures. This unwanted discharge is often referred as fuel ‘dribble’ and results in near-nozzle surface wetting, creating fuel-rich regions that are believed to contribute to unburnt hydrocar...
This paper introduces a minimum viable software product to filter large datasets of engine data recorded during laboratory experiments of combustion engines. The aim is to support analysts in the identification and analysis of specific physical phenomenon within hours of recorded engine experimental data. Specifically, the tool has been designed co...
The main ideas of the model for droplet heating and evaporation, based on the analytical solution to the heat conduction equation inside the droplet, and its implementation into ANSYS Fluent are described. The model is implemented into ANSYS Fluent using User-Defined Functions (UDF). The predictions of ANSYS Fluent with the new model are verified a...
The Proper orthogonal decomposition (POD) method has seen increasingly used in the last two decades and has a lot of applications for the comparison of experimental and numerically simulated data. The POD technique is often used to extract information about coherent structures dominating the flow. The two-dimensional and two-component instantaneous...
The analysis of a two-phase slug flow is of immense importance due to its vast applications in many industrial problems. A number of experimental and analytical studies have been carried out to study this complex and unwanted phenomenon. Mostly, these studies were limited to the liquid phase and to the statistical parameters and formation mechanism...
Previously developed droplet heating and evaporation models, taking into account temperature gradient, recirculation, and species diffusion within droplets, and their application to the analysis of commercial automotive fuel droplets are reviewed. It is shown that the most efficient analysis of Diesel fuel droplet heating and evaporation is based o...
Spray behaviour of marine cylinder lubricant was investigated experimentally using high-speed shadowgraphic techniques. Through the use of an optical liner and optical nozzle, spray behaviour has been characterised in these regions: in-nozzle flow, near-nozzle and free spray breakup, and liner impingement. The effects of viscosity are prominently v...
Detailed measurements of near-nozzle spray formation is essential to better understand and predict the processes involved in diesel fuel atomisation. We previously showed that direct imaging with sub-micron resolution could yield droplet size measurements in the near-nozzle region under non-evaporative conditions, without an arbitrary requirement f...
The morphological composition of a typical modern Diesel spray is known to include complex structures such as ligaments and amorphous droplets, but most laser dropsizing techniques cannot diagnose drops that deviate from the spherical shape. Whilst direct imaging has potential for resolving arbitrary shapes, challenges remain to measure microscopic...
A phenomenological study of the characteristics of a two-phase, oil and air mixture was undertaken in a combustion engine crankcase model at speeds of up to 6000 rpm. The idealized model comprised production components and tolerances. Nonintrusive measurement techniques, such as PIV and PDA and high-speed photography, were applied to the study of t...
This paper presents the role of imaging system design in developing an instrumentation technique to aid the validation of air–fuel mixing design hypotheses for use in next-generation internal combustion engines. In order to meet the challenge of extracting information from a research engine, the instrumentation system design was considered holistic...
This paper presents the role of image acquisition and analysis in the development of a new strategy for the calibration of measurements of fuel distribution in gasoline direct injection engines. Images are acquired from a motored experimental engine that features a quartz ring in its upper cylinder construction. A carefully chosen fuel analogue is...
This paper presents the development of a new strategy for the calibration of air-fuel ratio measurements in engines by laser-induced fluorescence (LIF). After a brief introduction to the LIF technique, the paper highlights the structured approach undertaken to ensure that accurate quantitative measurements were produced. In particular, the new appr...
For optimum efficiency, the direct injection (DI) gasoline engine requires two operating modes to cover the full load/speed map. For lower loads and speeds, stratified charge operation can be used, while homogeneous charge is required for high loads and speeds. This paper has focused its attention on the latter of these modes, where the performance...
This paper discusses the development of a laser-induced
fluorescence system which uses a novel optical access strategy to
measure fuel distribution in the cylinder of direct injection, spark
ignited, internal combustion engines. The focus is put on the several
steps taken to ensure that accurate quantitative measurements are taken,
while retaining...
Projects
Project (1)
Understanding the mechanisms that lead to the breakup and evaporation of liquids is a key step towards the design of efficient and clean combustion systems. The complexity of the processes involved in the atomisation of Diesel fuels is such that many facets involved are still not understood.
The morphological composition of a typical Diesel spray includes structures such as ligaments, amorphous and spherical droplets, but the quantity of fuel occupied by perfectly spherical droplets can represent a small proportion of the total injected volume. These relatively large non-spherical structures have never been thoroughly investigated and documented in high-pressure sprays, even though the increase in heat transfer surface area of deformed droplets is an influential factor for predicting the correct trend of evaporating Diesel sprays.
The characterisation of fuel spray droplets is generally conducted using laser diagnostics that can measure droplet diameters with a high level of accuracy, but they are fundamentally unable to measure the size or shape of non-spherical droplets and ligaments. Hence the data obtained through these diagnostic techniques provide a partial and biased characterisation of the spray.
The experimental bias towards spherical droplets is compounded by the complexity of modelling the heating and evaporation of deformed droplets. Consequently, theoretical models for liquid fuel atomisation and vaporisation are based on a number of simplifying hypotheses including the assumption of dispersed spherical droplets.
