Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-081412-151228


Document Typedissertation
Author NameRockwell, Scott
URNetd-081412-151228
TitleInfluence of Coal Dust on Premixed Turbulent Methane-Air Flames
DegreePhD
DepartmentFire Protection Engineering
Advisors
  • Ali S. Rangwala, Advisor
  • Kathy A. Notarianni, Committee Member
  • Simon W. Evans, Committee Member
  • Sanjeeva Balasuriya, Committee Member
  • Alfonso F. Ibarreta, Committee Member
  • Forman A. Williams, Committee Member
  • Keywords
  • experimental technique
  • turbulent burning velocity
  • coal
  • Date of Presentation/Defense2012-08-14
    Availability unrestricted

    Abstract

    The hazard associated with dust deflagrations has increased over the last decade industries that manufacture, transport, process, or use combustible dusts. Identification of the controlling parameters of dust deflagration mechanisms is crucial to our understanding of the problem. The objective of this study is to develop an experimental platform, called the Hybrid Flame Analyzer (HFA), capable of measuring the laminar and turbulent burning velocity of gas, dust, and hybrid (gas and dust) air premixed flames as a function of properties specific to the reactants such as dust-particle size and concentration.

    In this work the HFA is used to analyze a particle-gas-air premixed system composed of coal dust particles (75-90 µm and 106-120 µm) in a premixed CH4-air ( = 0.8, 1.0 and 1.2) flame. This work ultimately aims to improve the knowledge on fundamental aspects of dust flames which is essential for the development of mathematical models. This study is the first of its kind where multiple different parameters that govern flame propagation (initial particle radius, particle concentration, gas phase equivalence ratio, turbulent intensity, and integral length scale) are systematically analyzed in a spatially uniform cloud of volatile particles forming a stationary flame.

    The experiments show that the turbulent burning velocity is more than two-times larger than the laminar counter-part for each and every case studied. It is observed that smaller particles and larger concentrations (> 50 g/m3) tend to enhance the turbulent burning velocity significantly compared to larger particle sizes and lower concentration ranges. The experimental data is used to develop a correlation similar to turbulent gas flames to facilitate modeling of the complex behavior.

    Files
  • Rockwell_thesis_with_App_v06.pdf

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