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A nonlinear model of thermoacoustic devices
Sergey Karpov1, Andrea Prosperetti
1Department of Mechanical Engineering, The Johns Hopkins University Baltimore, Maryland 21218, USA.
The Journal of the Acoustical Society of America
|October 26, 2002
Summary
A new nonlinear, time-domain model enhances thermoacoustic device simulations by realistically modeling heat transfer and improving numerical robustness. This advanced model accurately simulates thermoacoustic prime movers and refrigerators.
Area of Science:
- Acoustics
- Thermodynamics
- Fluid Dynamics
Background:
- Thermoacoustic devices utilize heat and sound waves for energy conversion.
- Previous models often lacked realistic heat transfer modeling and numerical stability.
- Accurate modeling is crucial for designing efficient thermoacoustic systems.
Purpose of the Study:
- To develop a novel nonlinear, time-domain model for thermoacoustic devices.
- To incorporate realistic heat transfer mechanisms, including conduction in solid materials.
- To improve the numerical robustness and eliminate the need for artificial damping in simulations.
Main Methods:
- Utilized cross-sectional averaged equations for a nonlinear, time-domain approach.
- Developed a new method to model heat transfer perpendicular to the device axis.
- Included heat conduction within the solid boundaries of the thermoacoustic device.
Main Results:
- The model demonstrates improved numerical robustness compared to previous versions.
- It accurately simulates thermoacoustic prime movers, externally driven refrigerators, and combined systems.
- The novel heat transfer modeling provides more realistic device performance predictions.
Conclusions:
- The presented model offers a more accurate and robust simulation tool for thermoacoustic devices.
- It advances the understanding and design of systems relying on thermoacoustic effects.
- This nonlinear, time-domain model is a significant improvement for thermoacoustic research and engineering.