化工学报2016，Vol.67Issue(z2)：298-303,6.DOI:10.11949/j.issn.0438-1157.20161350
环路热声发动机驱动的热声制冷系统性能分析
Performance analysis on a looped thermoacoustic refrigeration system driven by thermoacoustic engine
摘要
Abstract
Thermoacoustic heat engine is a type of energy conversion machine with the merits of high reliability and environmental friendliness.The present work focuses on a looped travelling-wave thermoacoustic refrigerator with one thermoacoustic engine stage and one thermoacoustic refrigerator stage,connected by resonators.The required acoustic field for an efficient travelling-wave thermoacoustic system is featured by high acoustic impedance and appropriate phase relation close to travelling wave in the regenerator.In the presented thermoacoustic refrigerator, the installation positions of the regenerators could dramatically affect the acoustic field inside them,due to the fact that the acoustic field is highly sensitive to the variation in acoustic impedance.In order to investigate the effect of the installation locations of the thermoacoustic cores on the performance of the thermoacoustic refrigerator,the looped travelling-wave thermoacoustic refrigerator is simulated with DeltaEC,which is a software widely used for the simulation of thermoacoustic systems.In the simulation,the working fluid is helium at a mean pressure of 3 MPa, and the heating temperature and the cooling temperature are 227℃ and 0℃, respectively.The overall coefficient of performance of the whole system, the efficiency of the engine stage, the coefficient of performance of the refrigerator stage, the acoustic impedance and the phase difference in the two regenerators with different installation positions of the two regenerators have been analyzed.According to the simulation results,when the ratio of the distance from the engine’s regenerator to the refrigerator’s regenerator in the direction of the acoustic wave to the loop length is 0.24, the maximum overall coefficient of performance can be reached, corresponding to a relative Carnot overall coefficient of 0.13.When the ratio is within 0.21—0.26,the two regenerators can both achieve efficient thermoacoustic conversion,leading to high performance of the whole system.However,when it is larger than 0.26 or smaller than 0.21,the performance of the two regenerators will deteriorate,leading to poor performance of the whole system.关键词
热力学过程/热声发动机/热声制冷/优化设计/回热/数值模拟Key words
thermodynamic process/thermoacoustic engine/thermoacoustic refrigeration/optimal design/regeneration/numerical simulation分类
通用工业技术引用本文复制引用
杨睿,王祎,封叶,金滔..环路热声发动机驱动的热声制冷系统性能分析[J].化工学报,2016,67(z2):298-303,6.基金项目
国家自然科学基金项目(51276154,51576170),国家重点基础研究发展计划项目(2016YFB0901403)。@@@@supported by the National Natural Science Foundation of China (51276154,51576170) and National Key Research and Development Program (2016YFB0901403) （51276154,51576170）
