A5052851310- Advanced Combustion Engine Technologies
- Turbomachinery Performance and Optimization
- Refrigeration and Air Conditioning Technologies
- Combustion and flame dynamics
- Vehicle emissions and performance
- Advanced Thermodynamic Systems and Engines
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Combustion and Detonation Processes
- Advanced Thermodynamics and Statistical Mechanics
- Electric and Hybrid Vehicle Technologies
- Computational Fluid Dynamics and Aerodynamics
- Aerodynamics and Fluid Dynamics Research
- Spacecraft and Cryogenic Technologies
- Tribology and Lubrication Engineering
- Heat Transfer Mechanisms
- Catalytic Processes in Materials Science
- Biodiesel Production and Applications
- Rocket and propulsion systems research
- Heat Transfer and Optimization
- Spectroscopy and Laser Applications
- Advanced Aircraft Design and Technologies
- Electromagnetic Launch and Propulsion Technology
- Cyclone Separators and Fluid Dynamics
- Oil, Gas, and Environmental Issues
- Atmospheric chemistry and aerosols
Simon Fraser University
2020-2024
University of Bath
2013-2021
Applied Mathematics (United States)
2014-2019
Engineering and Physical Sciences Research Council
2014-2019
University of Bristol
2012
Imperial College London
2008-2011
University of Waterloo
2006
The paper discusses the concept, design and final results from 'Ultra Boost for Economy' collaborative project, which was part-funded by Technology Strategy Board, UK's innovation agency.The project comprised industry-and academiawide expertise to demonstrate that it is possible reduce engine capacity 60% still achieve torque curve of a modern, large-capacity naturally-aspirated engine, while encompassing attributes necessary employ such concept in premium vehicles.In addition achieving...
This paper investigates components of mechanical loss together with heat transfer effects in an axial-flux permanent-magnet motor. The generated within electrical machines are well known; however, their prediction or derivation has not been widely reported the literature. These, electromagnetic sources and effects, crucial must be accounted for when considering high-power-density, high-speed, and/or compact machine designs. research is focused on separating to gain a more in-depth...
Circumferentially divided, double entry turbocharger turbines are designed with a dividing wall parallel to the machine axis such that each feeds separate 180 deg section of nozzle circumference prior into rotor. This allows exhaust pulses originating from internal combustion be preserved. Since turbine is fed by two unsteady flows, phase difference between entering rotor will produce momentary imbalance in flow conditions around periphery research seeks provide new insight impact...
Most boosting systems in internal combustion engines utilize “pulse turbocharging” to maximize the energy extraction by turbine. An engine with more than four cylinders has a significant overlap between exhaust pulses which, unless isolated, can decrease overall pulse and increase pumping loss. Thus, it is advantageous isolate set of introduce gases into two or turbine entries separately. There are main types multiple entry turbines depending on method flow division: twin-entry double-entry...
Modern downsized internal combustion engines benefit from high-efficiency turbocharging systems for increasing their volumetric efficiency. However, despite the efficiency increase, turbochargers often lack fast transient response due to nature of energy exchange with engine, which deteriorates vehicle’s drivability. An electrically-assisted turbocharger can be used improving without any parasitic losses engine while providing recovery overall system The present study provides a detailed...
The experimental performance evaluation of a circumferentially divided, double-entry turbocharger turbine is presented in this paper with the aim understanding influence pulsating flow. By maintaining constant speed but varying frequency pulses, was shown to play an important role turbine. A trend decreasing cycle-averaged efficiency at lower frequencies measured. One principal objectives assess degree which unsteady differs from quasi-steady assumption. In order make steady-unsteady...
The experimental performance evaluation of a circumferentially divided, double-entry turbocharger turbine is presented in this paper with the aim understanding influence pulsating flow. By maintaining constant speed but varying frequency pulses, was shown to play an important role turbine. A trend decreasing cycle-averaged efficiency at lower frequencies measured. One principal objectives assess degree which unsteady differs from quasi-steady assumption. In order make steady-unsteady...
The current work investigates a circumferentially divided turbine volute designed such that each gas inlet feeds separate section of the wheel. Although there is small connecting interspace formed between nozzle and mixed-flow rotor inlet, this design does well to preserve exhaust energy in pulsed-charged application by largely isolating two streams entering turbine. However, type produces some interesting flow features as result unequal flows driving To investigate influence flows,...
Pressure and temperature levels within a modern internal combustion engine cylinder have been pushing at the limits of traditional materials design. These operative conditions are due to stringent emission fuel economy standards that forcing automotive engineers develop engines with much higher power density ratios. In this scenario, downsized, turbocharged an important technology meet future demands on transport efficiency. It is well known downsized gasoline engines, thermal management...
The paper discusses investigations into improving the full-load and transient performance of Ultraboost extreme downsizing engine by application SuperGen variable-speed centrifugal supercharger. Since its output stage speed is decoupled from that crankshaft, potentially especially attractive in a compound pressure-charging system. Such systems typically comprise turbocharger, which used as main charging device, compounded at lower charge mass flow rates supercharger second boosting stage....
Engine downsizing is a proven approach for achieving superior fuel efficiency. It conventionally achieved by reducing the swept volume of engine and employing some means increasing specific output to achieve desired installed power, usually in form an exhaust-driven turbocharger. However, because perceptible time needed turbocharger system generate required boost pressure, characteristic turbocharged engines their degraded driveability comparison with those naturally aspirated counterparts....
Abstract Wave rotors are unsteady flow machines that exchange energy through pressure waves. This has the potential for enhancing efficiency over a wide spectrum of applications, ranging from gas turbine topping cycles to pressure-gain combustors. paper introduces an aerodynamic shape optimisation power generating non-axial micro-wave rotor and seeks enhance shaft output while preserving wave rotor’s capacity function as pressure-exchanging device. The considers six parameters including...
To date, 59 countries, representing 54% of global greenhouse gas emissions have made pledges for net-zero targets within this century. This will require cleaner and more efficient sources energy which is driving research into small-scale engines auxiliary power units hybrid vehicles stationary generation. A suitable candidate such applications the micro turbine due to its high-power density, reliability low emissions. Further development required though their increasing parasitic losses...
Turbocharged diesel engines are widely used in off-road applications including construction and mining machinery, electric power generation systems, locomotives, marine, petroleum, industrial agricultural equipment. Such contribute significantly to both local air pollution CO2 emissions subject increasingly stringent legislation. To improve fuel economy while meeting limits, manufacturers exploring engine downsizing by increasing boost levels. This allows an increase IMEP without mechanical...
The exhaust gas from an internal combustion engine contains approximately 30% of the thermal energy combustion. Waste heat-recovery systems aim to reclaim a proportion this in bottoming thermodynamic cycle raise overall system efficiency. inverted Brayton (IBC) considered as potential exhaust-gas is little-studied approach, especially when applied small automotive power plants. Hence, model air-standard, irreversible Otto and IBC using finite-time thermodynamics (FTT) presented study heat...
<div class="section abstract"><div class="htmlview paragraph">Fuel efficiency and torque performance are two major challenges for highly downsized turbocharged engines. However, the inherent characteristics of SI engine such as negative PMEP, knock sensitivity poor transient significantly limit its maximum potential. Conventional ways improving problems above normally concentrate solely on side or turbocharger leaving exhaust manifold in between ignored. This paper investigates this...