共查询到16条相似文献,搜索用时 156 毫秒
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大型多功能热声发动机的研制及初步实验 第二部分:热声发动机的初步实验 总被引:13,自引:5,他引:13
行波热声发动机在回热器中进行的是可逆热声转换过程,理论上可以更高效地产生和传输声功,因而具有广阔的研究应用前景.对自行研制的大型多功能热声发动机进行了初步实验,着重研究了系统的起振、消振过程及压力波动情况.实验结果表明,该热声发动机比纯驻波型热声发动机具有更低的起振温度、更大的压比及更高的热声转换效率.以氮气为工质,在充气压力为9×105 Pa的条件下,该热声发动机最大压比达1.21,工作频率为25 Hz,这是当前国际上处于前列的实验结果. 相似文献
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对定加热温度下行波热声发动机驱动阻容负载进行了数值模拟,分析讨论了声阻和容抗对声功输出的影响。以氦气为工质,在充气压力为3 MPa、加热温度为923 K的条件下,对不同气库体积的热声系统进行了模拟;此外,还采用负体积气库模拟了阻抗虚部为正值的情况。计算结果表明,容抗值较大时,在负载相位角约为-45°(或45°)时,声功率存在一个极大值;当容抗值较小时,声功率会出现两个极大值和一个极小值,且在负载阻抗相位角约为-45°(或45°)时为极小值;此外,声功输出最大值与效率最大值对应的阻抗并不相同。 相似文献
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环路声学共振多级行波热声发动机的机理研究 总被引:1,自引:0,他引:1
针对环路声学共振多级行波热声发动机的工作机理进行了研究,重点分析了环路声学共振4级行波热声发动机无负载工作情况,并比较了环路声学共振4级、8级、16级行波热声发动机的工作性能。计算结果表明,这一行波热声发动机具有较好的声场分布并通过增大回热器横截面积有效降低了回热器内的粘性流动损失。增加环路声学共振多级行波热声发动机的级数仍能获得较为理想的工作性能,并能够增加整机产生净声功率,降低谐振管消耗声功率的比例,相对传统带驻波谐振管的行波热声发动机更为紧凑。 相似文献
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Effect of RC load on performance of thermoacoustic engine 总被引:2,自引:0,他引:2
Based on linear thermoacoustics, a symmetric standing-wave thermoacoustic engine connected with an acoustic resistance and acoustic compliance (RC) load was simulated to study the effect of the load impedance on the performance of the thermoacoustic engine. Experiments were performed to verify the simulation. Both the simulation and the experimental results show that there is a non-monotonic variation of the acoustic power delivered to the load with the acoustic resistance of the load and a maximal acoustic power may be obtained when the acoustic resistance equals to its compliance impedance. And a lower compliance impedance of RC load may lead to a higher acoustic power delivered to the load. 相似文献
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A miniature cascade thermoacoustic engine, which consisted of one standing-wave stage and one traveling-wave stage in series, was built and tested, which length was about 1.2 m, operating at 470 Hz using helium as working gas. The cascade modeling, the simulation and the primary experimental results are described in this paper. Four different configurations of the miniature cascade thermoacoustic engines had been designed and compared. According to the analysis, the diameter ratio of stages was designed to extend the traveling-wave region, which optimized value was about 1.69. The peak-to-peak value of the acoustic pressure was predicted to arrive to 3 bar at the 3 MPa mean pressure of helium when 300 W heating power was the input. The features of the engine were predicted delivering 68 W acoustic power with a thermal efficiency of up to 22.74% (the ratio of acoustic power to heater power). Due to careful designing, the engine self-excited the oscillation smoothly from the first experiment. An onset temperature gradient of about 4.5 K/mm was achieved, and the peak-to-peak acoustic pressure was 48 KPa at the 2 MPa mean pressure when 200 W heating power was the input. The design computation and experimental results showed a rather good agreement between the measured and calculated pressure phasor and temperatures distributions in the cascade thermoaoustic engine. 相似文献