共查询到17条相似文献,搜索用时 78 毫秒
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讨论了运动回热器的泵热制冷作用,建立了运动回热器控制方程的解析解。根据由热声理论得到的回热器泵热作用判据,指出回热器的泵热制冷作用有流道上有截面分布,这个截在分布受回热器运动的严重影响;讨论了回热器运动的相位及振幅对其泵热制冷作用的影响,所得结论表明了热声理论对热式热机工程实践发展的重要指导意义。 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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热声热机回热器特性参数影响的模拟分析及优化 总被引:1,自引:1,他引:0
本文对回热器的长度、水力半径或板叠间隙、回热器在驻波声场中的位置等回热器特性参数对其性能的影响进行了模拟分析,并在此基础上对回热器或板叠特性参数进行了优化。 相似文献
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Fathi Jebali Jean Valentin Lubiez Maurice-Xavier Franois 《International Journal of Refrigeration》2004,27(2):2672
The performance of a thermoacoustic refrigerator subjected to variable loading was analyzed experimentally and the data were compared with those obtained using a computational model. The computational model relies on one-dimensional cross-section-averaged equations discretized using the network analogy. The thermoacoustic refrigerator was modeled by dividing it into 1 mm long slices in the direction of the acoustic axis. The hot heat exchanger of the thermoacoustic refrigerator was maintained at ambient temperature and the temperature of the cold heat exchanger was varied to achieve temperature differences of ΔT=0, 5 and 10 K along the stack. The cooling load was measured and calculated for these temperature differences while varying the driving frequency between 30 and 65 Hz. The contribution of the progressive and stationary waves and the losses on the thermoacoustic heat flow was computed and discussed. 相似文献
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开式循环热声原理研究 总被引:1,自引:0,他引:1
稳定的开发流与热声循环的振荡流进行叠加,使开环流既是过程介质又是工作介质直接参与热声循环,从而构成开式热声系统,它具有与传统热声系统不同的热声作用机理。在开发式循环热声系统中,热声板叠中的温度分布和热流分布均发生有意义的改变。开式的循环声系统具有结构简单可靠、成本低和热效率高等特点,因而具有十分广阔的热声研究与应用前景。本文主要介绍了开式循环热声系统的工作机理和其网络模型。 相似文献
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The work proposes a simple and feasible calculation method--network model method to calculate temperature differences generated in thermo-driven thermoacoustic refrigerator (TAR). The theoretical calculation model is first built. The network model is given and used to make numerical calculations under different conditions including heat-pump stack positions in TAR, different oscillating pressure ratios (PR), plate spacings and different stack geometries. Theoretically calculated results show that the former two factors make significant influence on temperature differences, the influence of stack spacing on temperature difference has relation with PR, and cooling effect of pin-array stack is superior to that of parallel plate stack under other same conditions. Furthermore, theoretically calculated results and experimentally measured data are in good agreement at small acoustic pressure amplitude. 相似文献