## 5pPA9. Investigation of a toroidal thermoacoustic prime mover.

### Session: Friday Afternoon, December 6

### Time: 4:00

**Author: Hsiao-Tseng Lin**

**Location: Phys. Dept., Naval Postgrad. School, Monterey, CA 93943**

**Author: Anthony A. Atchley**

**Location: Phys. Dept., Naval Postgrad. School, Monterey, CA 93943**

**Abstract:**

A typical thermoacoustic prime mover has a well-defined acoustic impedance
in at least one place. For instance, many prime movers have a rigid end which
forces the acoustic velocity to be zero at that point. Such ``built-in''
boundary conditions serve as convenient starting points for computational
analysis of the performance of a device. They also serve to place the stack in a
thermoacoustically effective position relative to the acoustic field. A toroidal
prime mover poses some interesting questions. A toroidal prime mover has the
cold end connected to the hot end via a duct that does not impose any obvious
dominating boundary conditions that would force a node or antinode at any
particular point. Indeed, if the stack and heat exchangers were not there and
the toroid had a uniform cross section, a standing wave would have no
preferential orientation. In this work, a toroidal thermoacoustic prime mover
has been built and an experimental study is presented. A model based on acoustic
propagation in infinite periodic waveguides is proposed to simulate the
experimental results. [Work supported by the Office of Naval Research.]

ASA 132nd meeting - Hawaii, December 1996