共查询到18条相似文献,搜索用时 125 毫秒
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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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对一种新型热声制冷系统—双作用行波热声制冷机进行了研究,设计了一台在气液双作用行波热声发动机上使用的行波制冷机,并通过数值模拟优化了制冷机的结构尺寸.在环境温度300K,制冷温度250K的条件下,新型的双作用制冷机的COP达到了2.74,相对卡诺效率接近60%,声功消耗为534W,制冷量为1464.9W.通过对传统的斯特林制冷机及不同结构的行波制冷机计算比较.结果表明:从压比、效率、制冷量等多角度考察,新型的双作用行波制冷机更适合与气液双作用行波热声发动机耦合工作.它具有潜在的高效率、热驱动及无运动部件的优点,非常有潜力成为常规制冷方式的一种替代技术. 相似文献
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对一种新型热声制冷系统—双作用行波热声制冷机进行了研究,设计了一台在气液双作用行波热声发动机上使用的行波制冷机,并通过数值模拟优化了制冷机的结构尺寸。在环境温度300K,制冷温度250K的条件下,新型的双作用制冷机的COP达到了2.74,相对卡诺效率接近60%,声功消耗为534W,制冷量为1464.9W。通过对传统的斯特林制冷机及不同结构的行波制冷机计算比较。结果表明:从压比、效率、制冷量等多角度考察,新型的双作用行波制冷机更适合与气液双作用行波热声发动机耦合工作。它具有潜在的高效率、热驱动及无运动部件的优点,非常有潜力成为常规制冷方式的一种替代技术。 相似文献
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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:18,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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回热器工作的热声机理 总被引:1,自引:0,他引:1
从热致声的瑞利判据出发,给出了回热器工作的数学模型。据此分析证明了回热器不仅是逆流换热器,而且也是一个热声转换部件,即在纵向声波与横向热量波动的耦合下,可以实现热致声或声泵热或声输热。给出了在理想流体条件下,控制声场条件以调节或控制横向温差,从而改变回热器工作模式的原则方法。进而指出,对于用实际耗散流体的实际回热器,由耗散性质所造成的热声效应截面分布是回热器工作性能的另一决定因素。 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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《低温学》2017
Acoustic power at the cold end of regenerator is the measure of gross cooling capacity for a pulse tube cryocooler (PTC), which cannot be measured directly. Conventionally, the acoustic power can only be derived from the measurement of velocity, pressure and their phase angle, which is still a challenge for an oscillating flow at cryogenic temperatures. A new method is proposed for estimating the acoustic power, which takes use of the easily measurable parameters, such as the pressure and temperature, instead of the velocity and phase angle between the pressure and velocity at cryogenic temperatures. The ratio of acoustic powers at the both ends of isothermal components, like regenerator, heat exchangers, can be conveniently evaluated by using the ratio of pressure amplitudes and the local temperatures. The ratio of acoustic powers at the both ends of adiabatic components, like transfer line and pulse tube, is obtained by using the ratio of pressure amplitudes. Accuracy of the approach for evaluating the acoustic power for the regenerator is analyzed by comparing the results with those from REGEN 3.3 and references. For the cold end temperature range of 40–80 K, the deviation is less than 5% if the phase angle at the cold end of regenerator is around −30°. The simple method benefits estimating the acoustic power and optimizing the PTC performance without interfering the cryogenic flow field. 相似文献