Considering the effects of the heat leakage and internal irreversibility on the quality factor of thermoacoustic system,the quality factor was calculated,the expression of the quality factor was obtained.A numerical computation was made by using the stainless steel mesh as an example,the effects of the characteristic time on the quality factor was analyzed.Without the heat leak,the quality factor is monotonically increasing with the characteristic time ωτκ or ωτv ;with the heat leak,the quality factor has a process with the characteristic time that increases firstly and then decreases.There is a ωτκ or ωτv to make the quality factor maximum.Simultaneously,the factor quality factor decreases with the increasing of heat leakage or irreversible factor,and the quality factor decreases monotonously with the wire radius r0.%考虑热漏及系统的内部不可逆性对品质因数的影响而对品质因数进行了计算,得到品质因数的关系式.以不锈钢丝网为例对其进行数值计算,分析特征时间对品质因数的影响,当不考虑热漏时,品质因数随特征时间ωτk或ωτv单调增大；当考虑热漏时,品质因数随特征时间ωτk或ωτv先增大后减小,存在一个ωτk或ωτv值,使品质因数为最大值.同时热漏和不可逆程度因子增大使品质因数减小,品质因数随着丝网半径r0值单调减小.
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