Non-Zero Time-Averaged Thermoacoustic Effects, Linear or Nonlinear?
E. Luo
Chin. Acad. of Sci., Beijing, China
Abstract
N.Rott, et al. has developed a so-called linear thermoacoustic theory (LTAT) to explain nonzero, time-averaged thermoacoustic effects under acoustical approximation assumption. However, two important facts, which are given in the main text of this paper, have been a shortcoming of the LTAT for a long time. Here, the author proposes a distinguished viewpoint: that is, the nonzero, time-averaged thermoacoustic effects are basically nonlinear. With this new recognition, the author solves the two shortcomings encountered by the LTAT. Then, a framework of weakly nonlinear thermoacoustic theory is developed. For strongly nonlinear thermoacoustic systems, the full Computational Fluid Dynamics (CFD) method is a more powerful and feasible theoretical tool.
