共查询到20条相似文献,搜索用时 125 毫秒
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涡轮动叶冷却结构设计方法Ⅰ:参数化设计 总被引:2,自引:0,他引:2
基于冷却结构参数化设计、传统的管网计算方法与新兴的气热耦合数值模拟技术,提出了一套涡轮冷却结构设计方法,并编写了相关的设计程序与计算程序。利用参数化设计方法可以快速而精确地设计冷却结构,管网计算用于指导方案设计,气热耦合数值模拟用于指导详细设计。参数化设计中利用单元设计法程序实现动叶冷却通道快速设计;借助管网计算模型自动生成程序与CFD计算域三维实体快速造型方法,可以快速生成管网计算或在较短的时间内完成CFD计算域精确建模,为热分析计算提供条件。 相似文献
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甘孔银 《工程物理研究院科技年报》2009,(1):157-158
随着功率半导体器件的飞速发展,采用功率半导体器件串联和并联来研制高电压、高功率的固态开关已经成为了当今脉冲功率的发展方向之一。采用功率半导体研制的高压、大电流开关基本上具有理想的开关性能,在雷达发射机、射频加速器、癌症治疗、材料表面处理、食品非热等离子体处理和环境保护等领域都具有很好的应用前景。 相似文献
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Xiangdong Zhang Peiyi Shen Chengke Wu Zhensen Wu 《International Journal of Infrared and Millimeter Waves》1998,19(12):1735-1743
Sea surfaces should be considered as randomly rough surfaces at the infrared(IR) and optical bands. The geometric model of sea surfaces has been obtained by using image processing. Based on the electromagnetic scattering theory, the Laser Radar Cross Section(LRCS) for the sea surfaces is analyzed at IR band and the scattering properties of the sea surfaces have been gotten. 相似文献
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采用移位算子方法把时域有限差分法推广应用于二维磁各向异性色散介质—磁化铁氧体中.证明了电磁波横向入射二维轴向磁化铁氧体目标情形下,电磁波可按目标的轴向分解为横电波(TE波)和横磁波(TM波),且TE波的散射特性与铁氧体介质无关,而TM波的散射特性与介质电磁参量密切相关,同时对其物理原因进行了分析.通过采用移位算子方法处理磁化铁氧体频域本构关系,得到该情形下目标电磁散射的移位算子时域有限差的迭代计算公式,同时解决了电磁波在各向异性和频率色散介质中传播的问题.计算了轴向磁化铁氧体涂敷VonKarman型导体柱的TM波双站雷达散射截面,分析了铁氧体参量对目标双站雷达散射截面的影响.结果表明:恰当地选择铁氧体参量能有效地减少目标的雷达散射截面,本文时谐因子取exp〔jωt〕. 相似文献
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The Lunar Penetrating Radar(LPR)carried by Chang’E-3 has imaged the shallow subsurface of the landing site at the northern Mare Imbrium.The antenna B of the Channel-2 onboard the LPR(LPR Channel-2B)has collected more than 2000 traces of usable raw data.Because of the low resolution and noise of the raw data,only a few shallow geological structures are visible.To improve the resolution and the signal-to-noise ratio of the LPR data,we processed the LPR data including amplitude compensation,filtering,and deconvolution processes.The processing results reveal that the data processing in this study not only improves the signal-to-noise ratio of the LPR Channel-2B data but also makes the geological structures vivid.The processing results will lay the foundation for the subsequent geological interpretation and physical property inversion of lunar materials. 相似文献
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本文以一个通用合成孔径雷达光学处理器(简称OSARP)的检测为例,来说明OSARP的检测方法。给出OSARP的每个可调部件与合成孔径雷达(简称SAR)数据片的各特征参数间的关系,通过测量调整量求得OSARP的适用范围;用普通检测目标加位移透镜,来检测OSARP的成像质量。同时用模拟的SAR数据片,以另一种方法对OSARP做检测,结果相同。最后处理了真实SAR数据片,用来展示SAR和OSARP的综合成像质量。文中给出一些实验照片和数据,结果表明,本检测方法是可行的。 相似文献
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随着水轮发电机的大型化发展, 对发电机冷却技术的要求也越来越高. 不同冷却方式不仅会影响水轮发电机的结构, 同时也会影响发电机的能耗和可靠性. 本文首先对水轮发电机三种常见冷却方式进行了定性对比分析, 然后提出基于层次分析法的水轮发电机冷却方式综合评价方法. 最后, 利用该方法对李家峡400 MW空冷机组和蒸发冷却机组进行了综合评价, 评价结果表明蒸发冷却方式优于空冷方式, 本文所提出的评价方法能够定量计算冷却方式带来的水轮发电机性能差异, 为水轮发电机的节能改造提供了指导依据. 相似文献
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In this paper, we present a real-time measurement and adjustment method, based on scanning imaging, for optical transmitter which emits 90° × 2° linear laser beam. This novel optical arrangement consists of an area array CCD and two linear array CCDs. According to the relationship between the positions, angles of transmitter optical components and the beam parameters of emergent laser, the system can help us to decide the real-time adjustment of optical transmitter by measuring the related beam parameters. In order to improve the measurement speed, avoid occlusion and ensure simultaneous measurement, the two linear array CCDs are placed at near field, far field and separated by a definite angle to acquire the beam intensity distribution through suitable nonlinear correction during the process of scanning. After a complete scanning, the beam parameters and the spot image are acquired by continuous measurement. The proof-of-principle experiments showed that the measurement results were in agreement with the analysis. The presented method was applied to direct fast adjustment for higher quality on the assembly of the optical transmitter. The presented procedure is highly advantageous for diverse laser beam emitted from the optical transmitter, such as elliptic, linear and so on. 相似文献