共查询到18条相似文献,搜索用时 65 毫秒
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液氮温区J—T节流制冷机多元低温混合物工质热力循环优化设计 总被引:1,自引:0,他引:1
报道了针对液氮温区混合物工质J-T节流制冷机的热力循环优化计算。作者以制冷循环的卡诺系数为目标函数,考虑了压缩机的容积效率及换热器的传热温差损失等实际情况,采用复合形优化算法,在给定热力条件下来优化混合物最佳配比和循环最佳运行压力参数,计算结果对实际混合物制冷循环设计有一定指导意义。 相似文献
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混合物和纯氮工质在一种JT节流制冷机上热力性能的对比实验 总被引:1,自引:0,他引:1
报道了采用混合物工质及纯氮工质在一种开式快速JT节流制冷机上的实验对比研究。采用纯氮工质在压力为11.0Mpa左右,该JT节流冷机可获得的最低温度为83-84K,启动时间是75S左右;而采用混合物质后,在压力为5.0MPa左右,该制冷机可获得73-74K的最低温度;降温时间与纯氮相当。 相似文献
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空调压缩机驱动的80K温区的微型JT节流制冷机的试验研究 总被引:1,自引:0,他引:1
首次报道了在国内采用空调压缩机驱动的80~70K温区的闭式混合物工质JT节流制冷机的试验研究情况。由于采用了商用长寿命的空调压缩机作为动力源,将有可能使该种制冷机真正成为一种高可靠性、低价格的低温制冷机商品。 相似文献
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对工作在50~80K的混合物工质J—T节流制冷机作了初步的热力学分析。采用混合物工质在一种开式J—T节流制冷机上作了实验研究 相似文献
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混合工质节流制冷循环的优化原则及其应用 总被引:3,自引:0,他引:3
提出了在混合工质制冷循环优化中应遵循的三条较为合理和切实可行的优化原则。在此基础上,采用定循环运行压比优化方法,在较为合理的外部约束条件下,对二元混合工质循环进行了优化计算,分析了各设计变量对循环性能的影响,并进行了实验验证。 相似文献
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Presented is an approach to optimization which uses performance criteria from tests conducted on a large variety of different classes of nonlinearly constrained design problems, to improve the design optimization process. The knowledge gathering methods and evaluation techniques are discussed along with how heuristic procedures are integrated to enhance the program's optimization capabilities. 相似文献
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液氮分配系统中包括强制循环系统和重力输送自循环(自然循环)系统,重点介绍重力输送自循环(自然循环)液氮系统的性能和特点,分析出自然循环液氮系统是稳定、可靠、低液氮消耗和较高效率的系统。分配系统降低了工作温度,可以不用液氮泵,减少了系统中的阀门。设计自然循环系统前,要进行系统的热和液压分析,在自然循环系统设计中,系统的分析和预测是非常重要的,因为通过分析和验证才能保证系统内任何地方蒸发率都不超过10%,这可以明显减少设计风险。自然循环液氮系统已在多种低温设备中得到应用。 相似文献
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An enhanced multiobjective formulation technique, capable of emphasizing specific objective functions during the optimization process, has been demonstrated on a complex multidisciplinary design application. The Kreisselmeier - Steinhauser (K-S) function approach, which has been used successfully in a variety of multiobjective optimization problems, has been modified using weight factors which enables the designer to emphasize specific design objectives during the optimization process. The technique has been implemented in two distinctively different problems. The first is a classical three bar truss problem and the second is a high-speed aircraft (a doubly swept wing-body configuration) application in which the multiobjective optimization procedure simultaneously minimizes the sonic boom and the drag-to-lift ratio (CD/CL) of the aircraft while maintaining the lift coefficient within prescribed limits. The results are compared with those of an equally weighted K-S multiobjective optimization. Results demonstrate the effectiveness of the enhanced multiobjective optimization procedure. 相似文献
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L. WANG R. V. GRANDHI R. A. CANFIELD 《International journal for numerical methods in engineering》1996,39(5):787-803
An approximation based on multiple function and gradient information is developed using Hermite interpolation concepts. The goal is to build a high-quality approximation for complex and multidisciplinary design optimization problems employing analysis such as aeroservoelasticity, structural control, probability, etc. The proposed multidimensional approximation utilizes exact analyses data generated during the course of iterative optimization. The approximation possesses the property of reproducing the function and gradient information of known data points. The accuracy of the new approach is compared with linear, reciprocal and other standard approximations. Because the proposed algorithm uses more data points, its efficiency has to be compared in the context of iterative optimization. 相似文献