Savvas Gkantonas
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View article: Low-Order Modelling of Extinction of Hydrogen Non-Premixed Swirl Flames
Low-Order Modelling of Extinction of Hydrogen Non-Premixed Swirl Flames Open
Predicting the blow-off (BO) is critical for characterising the operability limits of gas turbine engines. In this study, the applicability of a low-order extinction prediction modelling, which is based on a stochastic variant of the Imper…
View article: Development of a low-order model of turbulent non-premixed flame global blow-off
Development of a low-order model of turbulent non-premixed flame global blow-off Open
A novel model for the global extinction of recirculating non-premixed flames has been developed and validated. This model is based on the imperfectly stirred reactor approach, derived from the spatially integrated conditional moment closur…
View article: A spark energy deposition model in mixture fraction space for simulations of turbulent non-premixed flame ignition
A spark energy deposition model in mixture fraction space for simulations of turbulent non-premixed flame ignition Open
Predicting the ignition probability remains important for designing reliable combustors. A spark ignition model in mixture fraction space is proposed and used in a Large Eddy Simulation (LES)-Conditional Moment Closure (CMC) simulation of …
View article: Onboard pre-combustion carbon capture with combined-cycle gas turbine power plant architectures for LNG-fuelled ship propulsion
Onboard pre-combustion carbon capture with combined-cycle gas turbine power plant architectures for LNG-fuelled ship propulsion Open
This paper investigates the concept of pre-combustion carbon capture (Pre-CCS) with a combined cycle gas turbine (CCGT) propulsion system to achieve energy efficient carbon capture onboard a Liquid Natural Gas fuelled vessel. A basic CCGT …
View article: LES-DCMC of dual-fuel ignition problems
LES-DCMC of dual-fuel ignition problems Open
This paper presents a Large Eddy Simulation (LES) methodology coupled with the Doubly Conditional Moment Closure (DCMC) model and detailed chemistry for investigating dual-fuel combustion problems. The approach uses both mixture fraction a…
View article: Modelling and optimisation of extinction actions for wildfire suppression
Modelling and optimisation of extinction actions for wildfire suppression Open
A physics-based model for the prediction of wildfire propagation, which combines the cellular automata concept with virtual Lagrangian fire particles, is further developed to include fire extinction actions. Deposition of water and firebre…
View article: Low-Order Autoignition Modeling for Hydrogen Transverse Jets
Low-Order Autoignition Modeling for Hydrogen Transverse Jets Open
This paper presents a method for evaluating the risk of autoignition for the canonical problem of an enclosed hydrogen jet in crossflow (JICF), which is highly relevant to the design of mixing ducts. The proposed method is based on the sep…
View article: Personalized displacement ventilation as an energy-efficient solution for airborne disease transmission control in offices
Personalized displacement ventilation as an energy-efficient solution for airborne disease transmission control in offices Open
There is evidence to suggest that airborne droplets play an important role in the transmission of respiratory diseases. The highest risk of exposure to these pathogens is in indoor environments, where airflow control has been recognized as…
View article: Particle Measurements from In-use Maritime Traffic Using an Unmanned Aerial Vehicle in Rafina, Greece
Particle Measurements from In-use Maritime Traffic Using an Unmanned Aerial Vehicle in Rafina, Greece Open
The University of Cambridge made particle measurements using handheld particle sensors and an unmanned aerial vehicle (UAV) on maritime emissions in Rafina, Greece. Two sets of three different handheld sensors were used to detect particles…
View article: Measurements and modelling of the three-dimensional near-field dispersion of particulate matter emitted from passenger ships in a port environment
Measurements and modelling of the three-dimensional near-field dispersion of particulate matter emitted from passenger ships in a port environment Open
The maritime sector poses significant challenges in controlling the emission of harmful pollutants, such as particulate matter, and reducing their impact on coastal areas and the atmospheric environment. Efforts to regulate the sector nece…
View article: Stochastic low-order modelling of hydrogen autoignition in a turbulent non-premixed flow
Stochastic low-order modelling of hydrogen autoignition in a turbulent non-premixed flow Open
Autoignition risk in initially non-premixed flowing systems, such as premixing ducts, must be assessed to help the development of low-NOx systems and hydrogen combustors. Such situations may involve randomly fluctuating inlet conditions th…
View article: Quantification of Autoignition Risk in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor and Surrogate Modeling
Quantification of Autoignition Risk in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor and Surrogate Modeling Open
The design and operation of premixers for gas turbines must deal with the possibility of relatively rare events causing dangerous autoignition (AI). Rare AI events may occur in the presence of fluctuations of operational parameters, such a…
View article: Estimation of Autoignition Propensity in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor Network Modeling
Estimation of Autoignition Propensity in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor Network Modeling Open
The study of autoignition propensity in premixers for gas turbines is critical for their safe operation and design. Although premixers can be analyzed using reacting computational fluid dynamics (CFD) coupled with detailed autoignition che…
View article: Estimation of Autoignition Propensity in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor Network Modelling
Estimation of Autoignition Propensity in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor Network Modelling Open
The study of autoignition propensity in premixers for gas turbines is critical for their safe operation and design. Although premixers can be analysed using reacting Computational Fluid Dynamics (CFD) coupled with detailed autoignition che…
View article: Quantification of Autoignition Risk in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor and Surrogate Modelling
Quantification of Autoignition Risk in Aeroderivative Gas Turbine Premixers Using Incompletely Stirred Reactor and Surrogate Modelling Open
The design and operation of premixers for gas turbines must deal with the possibility of relatively rare events causing dangerous autoignition. Rare autoignition events may occur in the presence of fluctuations of operational parameters, s…
View article: The cost-effectiveness of standalone HEPA filtration units for the prevention of airborne SARS CoV-2 transmission
The cost-effectiveness of standalone HEPA filtration units for the prevention of airborne SARS CoV-2 transmission Open
Objective Airborne infection from aerosolized SARS-CoV-2 poses an economic challenge for businesses without existing heating, ventilation, and air conditioning (HVAC) systems. The Environmental Protection Agency notes that standalone units…
View article: Modelling of Boil-Off and Sloshing Relevant to Future Liquid Hydrogen Carriers
Modelling of Boil-Off and Sloshing Relevant to Future Liquid Hydrogen Carriers Open
This study presents an approach for estimating fuel boil-off behaviour in cryogenic energy carrier ships, such as future liquid hydrogen (LH2) carriers. By relying on thermodynamic modelling and empirical formulas for ship motion and propu…
View article: Analysing the Performance of Ammonia Powertrains in the Marine Environment
Analysing the Performance of Ammonia Powertrains in the Marine Environment Open
This study develops system-level models of ammonia-fuelled powertrains that reflect the characteristics of four oceangoing vessels to evaluate the efficacy of ammonia as an alternative fuel in the marine environment. Relying on thermodynam…
View article: Estimates of the stochasticity of droplet dispersion by a cough
Estimates of the stochasticity of droplet dispersion by a cough Open
In this paper, the statistical distributions of the position and the size of the evaporating droplets after a cough are evaluated, thus characterizing the inherent stochasticity of respiratory releases due to turbulence. For that, ten inde…
View article: The Cost-effectiveness of Improving Indoor Air Ventilation for the Prevention of Covid-19 in Commercial Spaces
The Cost-effectiveness of Improving Indoor Air Ventilation for the Prevention of Covid-19 in Commercial Spaces Open
Objective : Airborne infection from aerosolized SARS-CoV-2 poses an economic challenge for the large number of small businesses without existing heating, ventilation, and air conditioning (HVAC) systems. Standalone units have been recommen…
View article: Data-Driven Incompletely Stirred Reactor Network Modeling of an Aero-Engine Model Combustor
Data-Driven Incompletely Stirred Reactor Network Modeling of an Aero-Engine Model Combustor Open
Accurate predictions of soot emissions from combustion systems are required to implement the design of low-emission aero-engine combustors that can mitigate the effects of particulate matter on human health and the environment. The use of …
View article: Conditional Moment Closure Approaches for Simulating Soot and NOx in a Heavy-Duty Diesel Engine
Conditional Moment Closure Approaches for Simulating Soot and NOx in a Heavy-Duty Diesel Engine Open
A heavy-duty diesel engine (ETH-LAV single cylinder MTU396 heavy duty research engine) was simulated by RANS and advanced reacting flow models to gain insight into its soot and NOx emissions. Due to symmetry, a section of the engine contai…