【摘要】 热声发动机工作频率关系到与负载的匹配情况,是热声发动机声能输出的重要评价指标。对热声发动机的频率调节手段进行了系统分析,试验验证了部分调频方法,并运用数值模拟分析了新的调频手段。研究发现,通过改变工质类型、改变谐振管长度和直径,可以在一定程度上有效调节热声发动机的工作频率。数值模拟结果显示,发动机内气体平均温度较平均压力和回热器长度对工作频率的影响更大。更多还原

【Abstract】 The working frequency of a thermoacoustic engine has effect on the matching mode of engine with the acoustic load.Its magnitude and stability are important criterion for the power output of a thermoacoustic engine.Some frequency adjustment methods were reviewed and verified experimentally and the numerical simulation by network mode was carried out.The experiment and simulation show that it is effective to adjust the working frequency by changing the working gas,varying the length and diameter of resonance tubes.Moreover,the numerical simulation indicates the mean gas temperature has more influence on the working frequency than the mean gas pressure and the length of regenerator.更多还原