Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

Browse

Filters

2007 - 200912010 - 20161

Settings

Subject: search.filters.subject.Diesel

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    IGNITION QUALITY TESTER CHARACTERIZATION WITH PURE COMPONENT AND CONVENTIONAL NAVY FUELS
    (2016) Mendelson, Jacob Lee; Gupta, Ashwani K; Mechanical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The U.S. Navy is attempting to reduce dependence on conventional diesel fuels as a part of the environmental initiative commonly referred to as “The Great Green Fleet”. The purpose of this research was to characterize the measurements of ignition delay gathered by the Advanced Engine Technology Ignition Quality Tester (IQT) with conventional Navy diesel fuels, pure component biodiesel fuels, primary cetane standards, and toluene-hexadecane blends. The use of computational analysis with pressure traces gathered from the IQT allowed for the comparison of IQT ignition delay results with various methods of calculating start of combustion for various fuels. Physical and chemical ignition delays of each fuel were also calculated using different separation techniques and the chemical ignition delay results were compared with prior academic literature and with chemical ignition delays calculated with Lawrence Livermore kinetic theory.
  • Thumbnail Image
    Item
    Characterization of PAH Composition Patterns in Diesel Emission
    (2007-01-22) Minegishi, Taeko; Baker, Joel E.; Marine-Estuarine-Environmental Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Particles and gases emitted by diesel vehicles can be toxic to human health. Polycyclic aromatic hydrocarbons (PAHs) and nitrated-PAHs (NPAHs) can be used as tracers to identify the contribution of diesel exhaust to the atmosphere. Air samples were collected near the Peace Bridge in Buffalo, NY, where studies have shown an association between asthma patients and traffic on the Peace Bridge. Positive Matrix Factorization (PMF) was used to estimate the source profile and the relative contribution of unknown emission sources. Four PAH sources identified were regional-scale volatilization, vehicle particulate matter, tar/asphalt volatilization, and diesel exhaust. Three NPAH sources identified were NO3 radical reaction, diesel exhaust and mixed sources. Volatilization was the major source of PAHs and NO3 radical reactions were the largest source of NPAHs in Buffalo, NY. Diesel exhaust accounted for approximately 30% of PAH and 18% of NPAH at the sampling site closest to the Peace Bridge.