Daanish TyrewalaUniversity of Wisconsin–Madison | UW · Department of Mechanical Engineering
Daanish Tyrewala
Master of Science
Doctoral Dissertator, UW-Madison
About
4
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Introduction
A need to decarbonize engine fuels exists to meet future GHG goals. Natural gas is a popularly explored alternative which has higher H/C ratio, but poor ignitability. Combustion strategies such as Diesel Pilot Ignition (DPI) enable the use of NG in ICEs. To further reduce the carbon footprint of ICEs, alternatives such as H2 and NH3 are also explored. Our objective is to understand combustion behavior that either limits or makes these alternatives more attractive to pursue.
Publications
Publications (4)
div class="section abstract"> This work experimentally investigates the impact of premixed fuel composition (methane/ethane, methane/propane, and methane/hydrogen mixtures having equivalent chemical energy) and pilot reactivity (cetane number) on diesel-pilot injection (DPI) combustion performance and emissions, with an emphasis on the pilot igniti...
Diesel-pilot injection (DPI) combustion utilizes a small injection of a high-reactivity fuel near top-dead center to ignite a premixed fuel/air mixture (usually natural gas). Currently, emissions of unburnt hydrocarbons (UHC) and carbon monoxide (CO) limit DPI operation at low-load. This work experimentally investigates the impact of the premixed f...
One of the key limitations to long-term space missions is to avoid propellant boil-off in a microgravity space environment. Even with the use of active and passive controls of propellants, boil off is inevitable. Long-term CFD simulations on propellant behaviors depend on evaporation/condensation coefficients (known as accommodation coefficients) w...
Passive and active technologies have been used to control propellant boil-off, but the current state of understanding of cryogenic evaporation and condensation in microgravity is insufficient for designing large cryogenic depots critical to the long-term space exploration missions. One of the key factors limiting the ability to design such systems...
