Open cycle traveling wave thermoacoustics: mean temperature difference at the regenerator interface

Area of Science:

• Thermodynamics
• Acoustics
• Heat Transfer

Background:

• Open cycle thermoacoustic engines utilize a steady flow of hot gas, replacing traditional heat exchangers.
• Steady-state operation necessitates a significant temperature difference between incoming gas and the regenerator's hot side.
• This temperature difference impacts overall device efficiency.

Purpose of the Study:

• To develop a numerical model for predicting mean temperature difference in open cycle thermoacoustic engines.
• To assess the influence of key design and operating parameters on this temperature difference.
• To evaluate the feasibility of open cycle thermoacoustic engines.

Main Methods:

• A numerical model was developed to simulate the thermoacoustic engine.
• The model predicts the mean temperature difference based on engine parameters.
• Key parameters analyzed include acoustic pressure, mass flow rate, phase angles, and conductive heat loss.

Main Results:

• The mean temperature difference depends significantly on acoustic pressure, mean mass flow rate, acoustic phase angles, and conductive heat loss.
• The model quantifies the relationship between these parameters and the temperature difference.
• The temperature difference at the regenerator interface is approximately proportional to the sum of acoustic power output and conductive heat loss.

Conclusions:

• The developed numerical model provides insights into the operational characteristics of open cycle thermoacoustic engines.
• Understanding and managing the mean temperature difference is crucial for optimizing engine efficiency.
• The findings support the assessment of feasibility for these novel thermoacoustic devices.