3 research outputs found
Sensor Systems For Combustion Control
This project is the first iteration of a larger multi-year project working towards utilizing ammonia (NH3) as an alternative fuel. The purpose of this iteration is a proof of concept for the creation of a control loop that can measure oxygen levels in a system and control the flow rates of nitrogen and oxygen in order to maintain an ideal ratio metric flow to reduce the overall emissions of the system. It is the hope of this project that the concept can eventually be used to maximally reduce to the point of near complete elimination of NOx emissions from burning ammonia as an alternative fuel. The scope of this project is to act as a starting point for research and testing towards the end goal of a cleaner more sustainable alternative fuel. This project confirms the ability to control flow rates of gases to maintain an ideal ratio of nitrogen to oxygen inside of a heating chamber test system through the measuring of voltage of an O2 sensor and adjusting of the flow rates of each gas based on the voltage value returned by the sensor
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A Very High-Power Density (60-70 kW/kg) SiC Inverter
This thesis describes a very high-power density inverter design for a power train that is intended to be used in an all-electric aircraft. The minimum power density for the power electronics for such an aircraft is 50 kW/kg, but this thesis details designs reaching 60 to even 70 kW/kg, even for a multilevel topology inverter. SiC devices were explored in this thesis because wider bandgap materials such as SiC and GaN can operate at higher temperatures, higher power densities, higher voltages, and higher frequencies – making it the most optimal choice for a long-range all-electric aircraft. This thesis also explored numerous multi-inverter topologies to find the most optimal one for the application – ranging from the typical half-bridge to a neutral-point clamped to even a flying capacitor inverter. Thermal calculations were made only for air-cooling; however, future designs aim for liquid cooling for a longer life-time design. Mechanical bus bar work for a prototype and future designs were made on Onshape and presented here. Additional improvements were explored, ranging from incorporating liquid cooling to an extension to soft-switching. A single-phase prototype was made and experimented. The results are presented in this paper. Currently, I am working on improving the prototype with a next iteration of the design, eventually incorporating it with the motor and thermal designs from other projects
Sensor Systems For Combustion Control
This project is the first iteration of a larger multi-year project working towards utilizing ammonia (NH 3 ) as an alternative fuel. The purpose of this iteration is a proof of concept for the creation of a control loop that can measure oxygen levels in a system and control the flow rates of nitrogen and oxygen in order to maintain an ideal ratiometric flow to reduce the overall emissions of the system. It is the hope of this project that the concept can eventually be used to maximally reduce to the point of near complete elimination of NOx emissions from burning ammonia as an alternative fuel. The scope of this project is to act as a starting point for research and testing towards the end goal of a cleaner more sustainable alternative fuel. This project confirms the ability to control flow rates of gases to maintain an ideal ratio of nitrogen to oxygen inside of a heating chamber test system through the measuring of voltage of an O 2 sensor and adjusting of the flow rates of each gas based on the voltage value returned by the sensor