共查询到20条相似文献,搜索用时 109 毫秒
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Su-xx光学雷达节流制冷器的优化设计 总被引:1,自引:0,他引:1
Su-xx光学雷达节流制冷器是用来冷却Su-27等机载雷达红外芯片的,它的性能优劣将直接关系到光学雷达搜索目标的效果。通过对国外同类型节流制冷器的研究分析,利用节流制冷原理建立了节流制冷器热交换器热负荷的数学模型,采用Delplli5.0编制的惩罚函数法等优化设计软件对其进行了计算分析,在给定的空间结构范围内得出了该热交换器的最优解,经过对比,实验验证了经优化设计后节流制冷器的性能明显提高,为今后节流制冷器的设计找到了一条切实可行的方法。 相似文献
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以实验为基础,研究一种快速制冷的微型制冷器的原理与特性(启动时间为3s,工作温度为-38℃)。由实验分析了节流孔径多孔介质、孔隙率等因素对制冷器特性的影响,以提出提高其性能的方向。 相似文献
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分离型二级脉管制冷机的实验研究第一部分20~40 K温区单级大功率脉管制冷机 总被引:3,自引:3,他引:0
为了满足液氦温区分离型二级脉管制冷机第二级预冷的需要,设计制作了1台20~40K温区单级大功率脉管制冷机.采用额定功率为6 kW的压缩机驱动该制冷机,最低制冷温度达13.8K,刷新了单级脉管制冷机最低制冷温度纪录.该制冷机在40 K可获得高达55.9 W的制冷量,基本可以满足15~40 K温区超导磁体等冷却的需要.着重分析了频率、充气压力和不同压缩机对系统制冷性能的影响,测试了长时间运行中系统性能的变化情况. 相似文献
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微型直吹式空调体积较小、便于携带,且可以达到环保、节能目的。既可用于户外也可用于室内进行小范围内的调温工作。通过对半导体制冷系统不同工作电压、环境温度及外部散热条件的研究,找出了影响半导体制冷性能的主要因素。确定了该微型直吹式空调在不同环境温度下的最佳工作电压为12V、最佳工作电流为4.5~4.8A,并认定存在最佳热端散热强度等。另外,通过实验得出了在不同环境温度下,工作在最佳工作参数条件时制冷器内部所能达到的最低温度。 相似文献
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介绍了一款大冷量高频单级同轴脉冲管制冷机的基本结构、数值模拟和实验性能。其线性压缩机采用Redlich动磁式直线电机驱动,压缩活塞对置布置,使用板弹簧支撑和间隙密封技术,80 K温区工作时的电机效率在83%以上。膨胀机的蓄冷器和脉冲管为同轴型布置,这种结构使冷头与器件之间的耦合非常方便。使用数值软件对制冷机整机和调相部件进行数值模拟,并对模拟结果进行实验验证。对制冷机的运行频率和制冷性能进行实验研究,制冷机在210.3 W输入电功时能获得10 W/80 K的制冷性能,比卡诺效率为12.66%,运行频率为62 Hz,整机重量小于5.5 kg。 相似文献
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This paper describes the theoretical performance and working parameters of a Joule–Thomson (J-T) cryocooler that is supplied with a nitrogen–hydrocarbon mixture and works in a closed cycle. Nowadays, they are the subject of intensive research in different laboratories around the world, especially in Asia and the USA. The industrial application of this type of cooler is significantly limited by the high values of working pressure for pure nitrogen. Supplying the system with a mixture of nitrogen and hydrocarbons makes it possible to reduce the level of the working pressure down to that which is achieved by commercially available compressors produced for the refrigeration industry. A theoretical analysis of the performance of the cooler is presented, along with the experimental results for different mixtures. The described cooler is characterized by high reliability, simple construction in the low-temperature section, and relatively low manufacturing costs. The system produces about 10 W of cooling power at an approximate temperature of 90 K. The cooling power can be used to cool down high-temperature superconductor magnets, in nanotechnology, for cryomedical applications, and to liquefy small amounts of nitrogen, argon, oxygen, or methane. 相似文献
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Multi-stage thermoelectric coolers offer larger temperature differences between heat source and heat sink than single-stage thermoelectric coolers. In this paper, a pyramid-type multi-stage cooler is analyzed, focusing on the importance of maximum attainable target heat flux and overall coefficient of performance, COP. Having considered the COP and the thermal resistance of a heat sink as key parameters in the design of a multi-stage thermoelectric cooler, analytical formulas for COP and heat sink thermal resistance versus working electrical current are derived. For a fixed cooling target heat flux, the ratio of the heat sink thermal resistance to the respective single-stage value and the attainable COP in a cascaded cooler are determined as a function of the number of stages. Numerical simulations clearly indicate that the thermal resistance of the hot side heat sink is the controlling factor in determining the overall performance of a multi-stage thermoelectric cooler. 相似文献
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The performance of the mixed refrigerant (MR) Joule–Thomson cooler is mainly dependent on the MR circulation composition for a given hardware. However, it is difficult to charge the MR to the desired circulation composition, due to the composition shift. In the present study, a novel strategy was proposed to solve this problem. In this strategy, the MR Joule–Thomson cooler is first charged with the initial charge amount, which is obtained by estimating the MR inventory in the cooler using the homogeneous model. Afterwards, the cooler is started and the MR circulation composition is adjusted to the corresponding optimal composition by adding the MR charge amount stepwise. Additionally, this strategy was verified by an experiment with a ternary mixture of methane, ethane and i-butane. The experimental results indicated that the MR circulation composition was able to be adjusted to the corresponding optimal circulation composition approximately within the relative deviation of ±5%. 相似文献
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为了能进一步提高单级G-M型脉管制冷机的性能,着重对80 K到300 K温区回热器的效率进行了理论和试验研究.通过对不锈钢和磷青铜丝网材料热渗透深度和热导率的分析,指出在这一温区采用不锈钢丝网的制冷性能优于磷青铜丝网.基于REGEN3.2进行的数值模拟,进一步指出适当增大不锈钢丝网目数有利于提高制冷性能,并由此指导实验取得了理想的结果.单级G-M型脉管制冷机经优化后,取得了11.1 K的最低制冷温度,是当前国内外报道的最好结果;同时该制冷机在20 K和30 K分别可获得17.8 W和40.7 W的制冷量. 相似文献