共查询到19条相似文献,搜索用时 93 毫秒
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《工程热物理学报》2016,(3)
优化匹配出口阻抗是热声制冷机获得最佳性能的关键点之一。本文提出了一种电机调相式热声制冷机方案,它利用直线发电机提供热声制冷机高效工作所需的相位,同时回收制冷机出口膨胀功并转换成电能,提高整机效率。与现有技术相比,本方案的热声制冷机具有制冷效率较高、结构简单的优点,适用于冷量比较大、制冷温度较高、膨胀功相对较多的情形。此外,还可满足热驱动热声冷电联产的应用需求。本文基于经典热声理论,先计算分析了直线发电机入口阻抗、制冷机入口压比对制冷性能的影响。在此基础上搭建实验台进行了初步实验,在平均压力3 MPa、工作频率55 Hz下,获得了110 K制冷量158.3 W,制冷机相对卡诺效率为16.1%,将回收的电功计入后整机效率达到了31.4%。 相似文献
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热声制冷机作为一种新型制冷技术,具有效率高、可靠性好、环境友好等特点。目前,室温温区热声制冷机存在回热器声功利用量少、出口声功大、回收损失大等问题。本文基于SAGE软件,对室温温区热声制冷机的工作机理进行了研究。通过对两级及以上热声制冷机的制冷系数、制冷量以及进出口阻抗相角进行分析,探寻同时提高声功利用率和制冷量的方法。在分别以制冷系数和制冷量为优化计算目标的前提下,得到了室温温区多级热声制冷机的制冷量、制冷系数及声功利用率随级数变化的变化规律。计算结果显示,多级热声制冷机对出口声功的利用率存在最大值。可根据实际需求综合考虑制冷系数及制冷量,以得到较优的制冷工况。 相似文献
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Huifang Kang 《中国物理 B》2022,31(3):34301-034301
The quantitative investigation of parameters in the renegerator is essential for the optimization of thermoacoustic devices, while the majority of the previous research only considered parameters of the working field, working gas and the hydraulic radius. Based on the linear thermoacoustic theory, this paper extracts a normalized parameter for low-amplitude conditions, which is called the regenerator operation factor. By extracting the regenerator operation factor and relative hydraulic radius, the influence of frequency on the efficiency can be controlled and offset. It can be found that thermoacoustic devices with different frequencies can perform the same efficiency by adjusting the radius in proportion to the axial length. Finally, this paper synthetically optimizes the dimension of the thermoacoustic regenerator by taking the regenerator operation factor, relative hydraulic radius and acoustic field parameter as variables. Conclusions in this paper are of great significance for explaining the best working conditions of engines and directing the miniaturization and optimal design of thermoacoustic devices. 相似文献
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A method for estimating the parameters of electrodynamic drivers in thermoacoustic coolers 总被引:3,自引:0,他引:3
The electroacoustic efficiency of high-power actuators used in thermoacoustic coolers may be estimated using a linear model involving a combination of six parameters. A method to identify these equivalent driver parameters from measured total electrical impedance and velocity-voltage transfer function data was developed. A commercially available, moving-magnet driver coupled to a functional thermoacoustic cooler was used to demonstrate the procedure experimentally. The method, based on linear electrical circuit theory, allowed for the possible frequency and amplitude dependence of the driver parameters to be estimated. The results demonstrated that driver parameters measured in vacuo using this method can be used to predict the driver efficiency and performance for operating conditions which may be encountered under load. 相似文献