An experimental comparison of a pin stack to a conventional stack in a thermoacoustic prime mover
Gibson, Rodney Jay
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This thesis is an experimental comparison of a pin stack to a conventional stack in a thermoacoustic prime mover. A thermoacoustic prime mover is a type of natural heat engine which converts a temperature gradient across a stack into acoustic energy. A pin stack uses wires which are arranged in a hexagonal array instead of the parallel or rolled plates of a conventional stack. The pin stack was constructed by by threading 75 micron constantan wire between the hot and cold heat exchangers 2312 times. Computer modeling with the program DeltaE predicts that a pin stack will significantly improve the efficiency of the prime mover. In the experiment the temperature gradient across the stack was supplied by submerging the cold end in liquid nitrogen while holding the hot end at ambient temperature. The experiment was conducted for both the pin stack and a conventional rolled stack. The pin stack produced 20% higher acoustic pressures than the rolled stack and the efficiency was up to 31% better. The pin stack went into onset at a 41% lower mean pressure than the rolled stack.
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Nessler, F. Scott (Monterey, California. Naval Postgraduate School, 1994-12);This thesis compares the pin stack with a conventional rolled stack for a thermoacoustic prime mover. A pin stack is a new geometry for stacks used in thermoacoustic engines consisting of a lattice ...
Bres, Elizabeth Vaughan. (Monterey, California. Naval Postgraduate School, 1983-12);The heat treatment response of M-50 steel, thermomechanically processed by warm rolling, was compared to that of the same material in a conventional, spheroidize-annealed condition. Warm rolling of M-50 produces markedly ...
Keolian, Robert M. (Monterey, California. Naval Postgraduate School, 1996-06-15); NPS-PH-96-005This technical report describes progress building and testing a 'pin stack' during the period 01 June 1995 through 31 May 1996. The pin stack produced 18% higher acoustic pressures, reached onset at a 40% lower mean pressure, ...