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Showing 1 to 14 of 14 for “"Combustion--Research"”.
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Design, set up and commissioning of a test facility for smokeless rich diesel combustion research
Low Temperature Combustion (LTC) is a strategy that harnesses the properties of exhaust gas, through the use of large quantities of exhaust gas recirculation (EGR), to reduce the peak combustion temperatures below that favoured by the formation processes of oxides of nitrogen (Ox) and those of …
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Modelling spherical flame propagation in a closed volume
The highly exothermic reaction of fuel combustion is the most common source of usable energy in the world. The fuel itself originates almost entirely from fossil fuels, such as crude oil and natural gas. The use of these fuels for energy production is under pressure in recent times due to …
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Towards Electrical Control Over Rocket Propellant Combustion
Electrical control over propellant combustion has the opportunity to improve the functionality and performance of various propulsion systems. In solid rocket motors, active burn rate modulation has the potential to enable throttling. In spacecraft propulsion systems, electrolysis of propellants may …
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Experimental study on two-dimensional propagating edge flames: cold flow modeling and flame spread rate measurements
… of the flame spread. Prior to conducting the combustion experiments, the apparatus was characterized using a steady-state numerical model of the non-reacting flow developed using the COSMOSFloWorks commercial computational fluid dynamics code. The model provided insights into the behavior of …
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Advancing turbulent reacting flow simulations with generalisable machine learning models for sub-grid FDF
… remains a significant challenge in computational combustion research, particularly within the large eddy simulation (LES) framework. This study investigates the application of machine learning (ML) techniques for predicting sub-grid filtered density functions (FDFs), aiming to improve accuracy, …
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Development of novel laser diagnostic techniques for the quantitative study of premixed flames
… fluid dynamical (CFD) models in technical combustion. The work comprises of a number of related studies, to address problems of relevance in the field of combustion research. The first part of this work involves the development and testing of an improved method for the computation of …
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Numerical Modelling of LOX Droplet Combustion in Hydrogen under Micro-gravity Conditions
… only water vapor as an exhaust. This makes LOX combustion research critical for improving combustion efficiency and avoiding flame instabilities in the rocket engine’s combustion chamber. The spray dispersion method is used to inject liquid oxygen into the combustion chamber, whereas hydrogen …
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Simulation of turbulent flames relevant to spark-ignition engines
Combustion research currently aims to reduce emissions, whilst improving the fuel economy. Burning fuel in excess of air, or lean-burn combustion, is a promising alternative to conventional combustion, and can achieve these requirements simultaneously. However, lean-burn combustion poses new …
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Multi-Dimensional Quantitative Laser-based Diagnostics - Development and Practial Applications
… optical diagnostic methods are routinely used in combustion research. Many of the more common approaches are based on illuminating a cross-section of the sample with a thin laser sheet. For example, by targeting an electronic transition in a molecule, its concentration within the plane illuminated …
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Propagation of large scale premixed turbulent flames
We examine premixed turbulent combustion within the context of a hydrodynamic model derived from physical first principles. This is an asymptotic model that exploits the multi-scale nature of the problem, characterized by two disparate length scales: the diffusion length scale representing the …
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Autoignition study of next generation aviation fuels and components
… and structure could result in different combustion performance, especially in the low temperature regime. This study is focused on evaluating the reactivity of diverse alternative fuels and related hydrocarbon components by investigating their ignition delay times at various autoignition …
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Physicochemical and performance study of next generation alternative jet fuels
… properties of aviation fuels and their impact on combustion performance in relevant applications for existing and emerging engine architecture with a particular focus on next generation alternative jet fuels (AJF). The Federal Aviation Administration (FAA) Center of Excellence for Alternative Jet …
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Performance of a Plasma Torch with Hydrocarbon Feedstocks for Use in Scramjet Combustion
Research was conducted at Virginia Tech on a high-pressure uncooled plasma torch to study torch operational characteristics with hydrocarbon feedstocks and to determine the feasibility of using the torch as an igniter in scramjet applications. Operational characteristics studied included electrical …