Faculty Advisor or Committee Member

Ali S. Rangwala, Advisor

Faculty Advisor or Committee Member

Alfonso F. Ibarreta, Committee Member

Faculty Advisor or Committee Member

Simon W. Evans, Committee Member

Faculty Advisor or Committee Member

Forman A. Williams, Committee Member

Faculty Advisor or Committee Member

Sanjeeva Balasuriya, Committee Member

Faculty Advisor or Committee Member

Kathy A. Notarianni, Committee Member

Identifier

etd-081412-151228

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. "

Publisher

Worcester Polytechnic Institute

Degree Name

PhD

Department

Fire Protection Engineering

Project Type

Dissertation

Date Accepted

2012-08-14

Accessibility

Unrestricted

Subjects

experimental technique, turbulent burning velocity, coal

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