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 19 of 19 for “"Volumetric Efficiency"”.
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Intake Manifold Design for an Air Restricted Engine
… have used historically to help determine peak volumetric efficiency per engine rpm. Methods such as Helmholtz Resonator Tuning and Pressure Wave Tuning have been used substantially to determine an engine’s operating conditions. However, these methods are flawed for the restricted engine case …
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Reliability Assessment of Rolling Piston Rotary Type Compressos
… increase in the amount of leakage degrades the volumetric efficiency and the overall performance of the compressor. The objectives of this study are to predict the life span of rolling piston rotary-type compressors through the measurement of wear on the roller under accelerated test conditions, …
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The effect of inlet swirl on knock limits in spark ignition engines
… have a significant effect on swirl ratios and volumetric efficiency. However, although the volumetric efficiency was reduced, the deposits enhanced the swirl ratios for this particular case. This is contrary to the general belief that deposits reduce swirl.
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Characterisation of a new nanostructured aluminium alloy and piston design for internal combustion engines
… pressure to reduce pollution and improve the efficiency of internal combustion engines. The lighter the mass of a vehicle the lower the energy required to propel it and potentially the lower the emissions that will ensue. Also, reducing piston mass affects piston and ring assembly frictional …
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Performance and emission characteristics of an automotive diesel engine using biodiesel fuel with the influence of air intake variables
… grill at the front of a vehicle to enhance the volumetric efficiency. However due to wading performance, for a sport utility vehicle like a Land Rover Freelander the air grill is located at the side of the front tyre. The air speed at the grill side is high and creates negative pressure, thus …
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Development of a CNG intensifier for high pressures
… constant at 200 bar. Taking into account volumetric efficiency and the need to limit compression temperature for satisfactory life of the elastomer seals, the performance of the intercooled two-stage intensifier prototype proved to be decisively superior, providing volumetric efficiencies …
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Downhole Gas Separator Performance in Sucker Rod Pumping System
Volumetric efficiency of a sucker rod pump has been a major concern for artificial lift designers for a long time. One way to reduce the amount of gas entering into the pump is to use downhole gas separators. The main purpose of these devices is to facilitate agglomeration of gas bubbles so that …
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Computational fluid dynamical studies of structured distillation packings
… the process industries because of their improved volumetric efficiency. Most structured packings consist of corrugated sheets placed in the vertical plane The corrugations provide a regular network of channels for vapour liquid contact. Until recently it has been necessary to develop new packings …
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An estimation of the performance of spark ignition methanol engines
… was based on an estimate of the indicated efficiency, the volumetric efficiency and the frictional losses of a methanol engine, from which the shaft power and overall efficiency could be determined. The performance of three engines, which were converted to methanol operation, was used to …
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Design and Construction of a High Pressure System for Evaluating Multiphase Twin-Screw Pumps
… facility is validated by comparing the volumetric efficiency, mechanical efficiency, and pump effectiveness results to a previous open-loop facility that was also used to test the same twin-screw pump. Suggestions are given to replace an air valve to allow for more precise control of the …
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Modeling and Experimental Validation of Disc and Reed Style Check Valves for Hydraulic Applications
… conditions. Pump delivery, which is a measure of volumetric efficiency, and check valve position were chosen as the validation metrics. Experimental results showed that both the disc and reed check valve model accurately predicted the timing of valve opening and closing. The disc valve model …
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Dielectric and Ferroelectric Properties of Lead Lanthanum Zirconate Titanate Thin Films for Capacitive Energy Storage
… aspects. To lower the cost and increases the volumetric efficiency and reliability, relaxor thin films are considered as one of the candidates of the next generation capacitors. The research mainly focuses on dielectric and ferroelectric properties of lead lanthanum zirconate titanate or …
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Modeling and Design of Planar Integrated Magnetic Components
… of a planar inductor involves a tradeoff between volumetric efficiency and low value of winding capacitance. Throughout, 2D and 3D FEA was indispensable for thermal & electromagnetic modeling.
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Grid Generation and CFD Analysis of Variable Geometry Screw Machines
… could be used. With variable lead rotors the volumetric efficiency could be improved by reducing the sealing line length in the high pressure zone. Calculations with inflation layers showed that local velocities were better predicted but there was no substantial influence on the integral …
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AN INNOVATIVE WORKING CONCEPT FOR VARIABLE DELIVERY FLOW EXTERNAL GEAR MACHINE
An innovative and unique working concept for variable delivery external gear machines (VD-EGMs) is presented in this study. The proposed design not only encompasses all the well-known and important advantages of traditional external gear machines but also introduces a feature for varying the …
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Octane requirement increase arising from the use of lead free fuel
… increase or rise in engine knock and decreased volumetric efficiency. The detrimental effect of the deposits has been attributed to the physical volume of the deposit and to changes in heat transfer. This study attempts to assess why leaded deposits, though often greater in mass and volume, …
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Making Decentralized Desalination More Affordable Using Improved Process Design, Control, and Energy Recovery
… that production performance is sensitive to volumetric efficiency. Based on this finding, vanes were selected over gears for prototyping. The prototype enabled a 17% decrease in measured power consumption, and through characterizing friction, we determined that these savings could be doubled …
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Exergy Based SI Engine Model Optimisation. Exergy Based Simulation and Modelling of Bi-fuel SI Engine for Optimisation of Equivalence Ratio and Ignition Time Using Artificial Neural Network (ANN) Emulation and Particle Swarm Optimisation (PSO).
… heat transfer, brake work, brake thermal and volumetric efficiency, brake torque, brake power (BP), brake specific fuel consumption (BSFC), brake mean effective pressure (BMEP), concentration of CO2, brake specific CO (BSCO) and brake specific NOx (BSNOx). In this model, the effect of engine …
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Investigation to direct ethanol injection in spark ignition gasoline engines
… system. The research purpose was focused on efficiency improvement (leveraging effect) and emissions reduction. Engine performance at original engine spark timing setting (15 CAD BTDC), knock margin and lean conditions was carried out to assess EDI+GPI’s effectiveness. The impacts of EDI+GPI …