Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 100 for “"injectors"”.
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Shape grammar for medical injectors
This thesis explores the applicability of algorithmic design for biomedical device design through the use of the shape grammar formalism. This method is expressed as an algorithm that describes the computational mechanism for composing shapes utilizing symbols, geometry, and algebraic operations. …
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Investigations of Injectors for Scramjet Engines
… showed that the aero-ramp and single-hole injectors had the same overall losses. The natural extension of the investigation was then to look in detail at two major physical phenomena that occurs in a complex injector design such the Aeroramp: the jet-shock interaction and the interaction of …
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Multihole injectors for direct-injection gasoline engines
… nozzles represent the second-generation injectors. Thus, complete investigation of multi-hole nozzle flow, spray characteristics and their engine performance is a vital part of development of future DI gasoline engines. The internal nozzle flow of an enlarged transparent multi-hole …
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Modelling the neutralisation process in neutral beam injectors
High power neutral beams currently play an important role in heating, fuelling and diagnosing magnetically confined thermonuclear fusion plasmas. At the Joint European Torus (JET) in Oxfordshire, England, the formation of such a beam involves passing a positive ion beam through a neutral gas target …
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Study of deposit formation inside diesel injectors nozzles
Diesel engines are widely used in heavy duty transportation applications such as in trucks, buses and ships because of their reliability and high torque output. A key diesel technology is the injection system which is constantly improved to produce better spray quality and deeper spray penetration …
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On the nilpotent injectors of the general linear groups
… $\leq$ 2. Among other results the nilpotent injectors of GL(n,q) are determined and shown to consist of a unique conjugacy class of subgroups of GL(n,q). It will also be proved that if n $\not=$ 2, then the nilpotent injectors of GL(n,q) are the nilpotent subgroups of maximal order.
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Design and Experimental Characterization of Electrostatically Assisted Automotive Fuel Injectors
With current automotive fuel injector designs, fuel mass and momentum cannot be independently controlled during engine operation. By introducing electrostatic charge to the fuel as it is injected, a means of altering the injector spray pattern without changing the mass injected is available. A …
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Study of advanced railgun hydrogen pellet injectors for fusion reactor refueling
An advanced railgun system has been developed to assess its feasibility as a hypervelocity hydrogen pellet injector for magnetically confined plasmas. It consists of a pellet generator/gas gun assembly for freezing hydrogen pellets and injecting them into the railgun at velocities as high as 1.5 …
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Finite difference modeling of oil recovery by waterflooding using horizontal well injectors
… vertical wells. The performance of vertical well injectors in waterflooding an oil reservoir have been extensively investigated and reported in the literature. The detailed analysis of the performance of horizontal well injectors, on the other hand, is not found in the literature. The objective of …
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Investigation of in-nozzle flow characteristics of fuel injectors of IC engines
… studies have shown that cavitation in diesel injectors leads to smaller droplet formation, especially by the on-going trend towards higher injection pressures, which enhances fuel evaporation but also creates undesirable consequences due to transient nature of cavitation such as spray …
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Visualization of transient single- and two-phase jets created by diesel engine injectors
… gas, and gas-diesel) electronically controlled injectors, were observed in a constant-volume chamber charged with air, the pressure of which varied from atmospheric to 3.5 MPa. The injection (gas-to-chamber) pressure ratio varied from 1.5 to 8 for gas injection. The liquid-gas mass ratio of the …
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Numerical Investigation of Liquid Film Dynamics and Atomisation in Jet Engine Fuel Injectors
Today’s aerospace industry continues to exploit liquid hydrocarbon fossil fuels. Motivated by operational considerations, continued availability and cost, this is likely to be the case for many years, despite the obvious environmental concerns. The interplay of liquid atomisation, spray …
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A Study of Plasma Ignition Enhancement for Aeroramp Injectors in Supersonic Combustion Applications
The main goal of this project was to investigate the mixing and chemical phenomena associated with the integration of a low-power, uncooled plasma torch into a fuel injector array. The potential application was for an integrated scramjet igniter/injector, with the hope of producing superior mixing …
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Optimum performance of solenoid injectors for direct injection of gaseous fuels in IC engines
… strong demand for electronically controlled gas injectors. This thesis investigates a solenoid operated fuel injector discharging gaseous fuel directly into the combustion chamber of an engine. A switching circuits is designed to boost the solenoid coil current for quick electromagnetic force …
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A CFD investigation of cavitation and associated deposit formation in modern diesel fuel injectors
… vehicles are becoming more stringent. Modem fuel injectors on common-rail diesel vehicles use very high rail pressures to aid atomisation and increase combustion efficiency. However, associated with the high injections pressures is the issue of nozzle cavitation. Cavitation leads to pockets of …
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The adaptation of solenoid actuated injectors for use with dimethyl ether fuel in diesel engines
… Simultaneously, electronic actuated fuel injectors, with the use of solenoids, have repeatedly demonstrated superior performance with respect to needle movement control. This thesis, in order to combine the advantages of both electronic actuation and DME fuel, presents an adaptation of the …
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The effects of fuel volatility and operating conditions on sprays from pressure-swirl fuel injectors
Optimal design of modern direct injection gasoline engines depends heavily on the fuel spray. Most of the studies published regarding these fuel sprays involve cold bench tests or motored optical engines, neglecting the roles of the fuel volatility and temperature. This study, therefore, was …
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Computational Studies of Penetration and Mixing for Complex Jet Injectors to Aid in Design of Hypersonic Systems
… an aerodynamic ramp consisting of four injectors in an array, a diamond injector both aligned and yawed 15° to the oncoming flow. The Computational Fluid Dynamics (CFD) tools were more accurate compared to experiment in the prediction of the aeroramp injector than the diamond-shaped …
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Fuel injection flow metering systems & test strategies for the characterisation of fuel injectors for future heavy duty commercial vehicles
… for the characterisation of heavy duty diesel injectors at the end of manufacture and assembly. The first part of the study focused on three commercially available metering devices and the main principles they employ. An experiment was carried out to benchmark the performance of each device in …
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