Effect of a resistive load on the starting performance of a standing wave thermoacoustic engine: A numerical study.
The influence of a resistive load on the starting performance of a standing-wave thermoacoustic engine is investigated numerically. The model used is based upon a low Mach number assumption; it couples the two-dimensional nonlinear flow and heat exchange within the thermoacoustic active cell with one-dimensional linear acoustics in the loaded resonator. For a given engine geometry, prescribed temperatures at the heat exchangers, prescribed mean pressure, and prescribed load, results from a simulation in the time domain include the evolution of the acoustic pressure in the active cell. That signal is then analyzed, extracting growth rate and frequency of the dominant modes. For a given load, the temperature difference between the two sides is then varied; the most unstable mode is identified and so is the corresponding critical temperature ratio between heater and cooler. Next, varying the load, a stability diagram is obtained, potentially with a predictive value. Results are compared with those derived from Rott's linear theory as well as with experimental results found in the literature.
Université Pierre et Marie Curie UPMC Sorbonne Universités, UFR 919 - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur, 91405 Orsay Cedex, France.
Lin
L
Ma
Université Pierre et Marie Curie UPMC Sorbonne Universités, UFR 919 - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur, 91405 Orsay Cedex, France.
Catherine
C
Weisman
Université Pierre et Marie Curie UPMC Sorbonne Universités, UFR 919 - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur, 91405 Orsay Cedex, France.
Diana
D
Baltean-Carlès
Université Pierre et Marie Curie UPMC Sorbonne Universités, UFR 919 - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur, 91405 Orsay Cedex, France.
Ivan
I
Delbende
Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
Luc
L
Bauwens