ABSTRACT: A simplified quasi-one-dimensional model of thermoacoustic devices is formulated
by averaging the conservation equations over the cross section. Heat transfer and drag
effects are introduced by means of suitable coefficients. While the primary motivation for
this work is the development of a model approximately valid in the nonlinear regime, the
focus of this paper is the proper formulation of the transfer coefficients and the
analysis of the linear problem. The accuracy of the model is demonstrated by comparison
with existing more precise theories and data. Examples of devices with variable cross
section demonstrate the flexibility of the approach.
J. Acoust. Soc. Am. 102, 3484-3496, 1997
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