Title page for ETD etd-12312007-205337


Type of Document Master's Thesis
Author Evans, Richard Blaine
Author's Email Address evans97@vt.edu
URN etd-12312007-205337
Title Modeling and Testing of a Micro-Tubular Low-Temperature Fuel Cell for use in a Micro Air Vehicle
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
von Spakovsky, Michael R. Committee Chair
Ellis, Michael W. Committee Member
Nelson, Douglas J. Committee Member
Keywords
  • PEM Fuel Cell
  • Micro-tubular
  • Micro Air Vehicle
Date of Defense 2007-12-19
Availability unrestricted
Abstract
Micro air vehicles (MAVs) are small remote controlled aircraft used by military personnel for reconnaissance and are currently powered by batteries. The MAVs rely on the battery for propulsion, navigation, and reconnaissance equipment. The thrust of this research is to develop a fuel cell system capable of higher power densities, higher power to weight ratios, and increased overall power output than the batteries in use today. To this end, a feasibility study is first conducted to determine if fuel cells could be used to replace batteries as the MAV power source and what fuel cell configurations would show the best performance. Hydrogen, methanol, and formic acid fuel cells are considered, using a conventional flat-plate design and a novel micro-tubular design. Several micro-tubular fuel cells (MTFCs) are tested to show that these cells are a possibility for power production in MAVs. Those tested are developed and improved in collaboration between Luna Innovations, Inc. and the Center for Energy Systems Research at Virginia Tech and then manufactured by Luna Innovations, Inc. Also, an isothermal, lumped-parameter (LP) model for MTFCs is developed to predict behavior. The use of this LP model aids in understanding the dominant losses of the cell and ways of improving cell performance.

Results from the feasibility study indicate that by using methanol powered MTFCs a 50% increase in overall energy output is possible, while also decreasing the mass of the power production system. Through testing and an iterative design process, an increase of three orders of magnitude of the maximum power production of the MTFCs constructed by Luna Innovations, Inc., has been realized. Results of the LP MTFC model are compared with the experimental results from the MTFC testing and tubular cells from the literature.

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