Numerical Computation of the Coefficient of Performance and Optimal Design of the Stack in Thermoacoustic Refrigerators

doi:10.3901/JME.2017.20.145

Abstract

Abstract: Stack is the most important component in the thermoacoustic engine for it directly affects the efficiency. For standing-wave thermoacoustic refrigerator, a numerical algorithm for the coefficient of performance of stack and an optimal design method of stack are presented, respectively. Considering the limits of the short-stack approximation method for stack, we an iterative algorithm for coefficient of performance of stack is constructed, by which the total power together with pressure, volume flow rate, average temperature function and gradient of temperature can be obtained at the same time. Based on the presented numerical method, the effects of length, width, position, block ratio and temperature difference on the coefficient of performance of stack are investigated. Then, choosing length, width, position and block ratio of stack as the design variables and coefficient of performance as the optimization objective, the thermoacoustic stack is optimized by using the genetic algorithm. Compared with the short-stack approximation method, the numerical method presented in the work is more accurate and the optimized results are more acceptable since some practical factors are taken in account.

Key words: genetic algorithm, linear thermoacoustics theory, optimal design, thermoacoustic refrigerator

CLC Number:

TB61

JIN Chengming, PENG Yehui, LIU Deshun. Numerical Computation of the Coefficient of Performance and Optimal Design of the Stack in Thermoacoustic Refrigerators[J]. Journal of Mechanical Engineering, 2017, 53(20): 145-152.

References

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