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旅客机客舱供、排气系统对于客舱内部气流流动和温度分布具有重要影响,乘客的几何结构和热载荷等因素也会影响舱内气流流动。对CJ818客舱、供气系统和排气系统进行了几何建模及有限元建模,应用非结构化网格对模型进行离散,应用全隐式多网格耦合求解技术求解N-S方程,采用RNGk-ε模型封闭方程组。分别对单排座椅和多排座椅客舱进行了简化建模,研究了其在设计方案下舱内流动情况,并分析了乘客几何结构和乘客散热对舱内流动的影响,同时分析温度场和流场之间的依变关系。研究结果对于客舱空气分配系统设计和优化,客舱空气质量控制具有参考意义。 相似文献
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<正>客舱空气系统作为飞机系统的关键部分之一,其设计不仅关系到客舱舒适度,而且还涉及安全规章要求以及飞机的整体设计。当前,该系统的供应商都在深度改进产品,以应对飞机和发动机的设计革新。同时也在从大数据分析出发,使该系统的维修变得更具可预测性。客舱空气系统不只是安装在飞机客舱里的一种空气调节系统,它还能在机外温度低到零下几十度并且气压达到海平面的四分之一以下时为客舱增温和增压。大多数客舱空气系统是利用发动机引气,这就给引气系统带来了重大的技 相似文献
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用于客舱墙壁的新型硅胶隔音材料,其弯挠性更好,可紧贴于客舱壁面,使客舱更安静。飞机发动机的运行声音或者高速气流产生的声音都可能引起噪声,影响客舱内的乘客。众所周知,减轻噪声的方法之一是在客舱墙壁中采用隔音材料。但并不是所有 相似文献
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正高密度客舱提高航空公司运营效益是当前的普遍现象。为此,制造商和航空公司在充分利用客舱空间方面投入了很多精力,如客舱和舱门的重新布局、内饰和座椅的创新设计等,并通过引进VR娱乐系统等手段进一步提高乘客的飞行体验。今年4月10-12日在汉堡展览中心举办的飞机内饰博览会上出现了一个口号——"让微小空间得到充分利用"。这也反映了当前飞机制造商和各类客舱设备供应商的一个共同理想,即设法使客舱的每一寸空间都能带来收益。当然,要实现这一理想需要应对客舱密集化和航空旅行商品化两大趋势的挑战。 相似文献
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刘文恭 《民用飞机设计与研究》2001,(1)
MD-90飞机采用成熟的空气循环式空调系统,为客舱和驾驶舱提供调节空气,用于通风、空气循环、增压和温度调节,由制冷系统、座舱温度控制系统、增压控制系统、再循环系统、冲压空气通风系统与分配系统等子系统组成(参见图1).本文将对与空调系统密切相关的气源系统进行介绍和分析. 相似文献
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Oxygen Isotopes in the Solar System 总被引:1,自引:0,他引:1
The oxygen three-isotope system has major advantages over the two-isotope systems of hydrogen, carbon, and nitrogen because
different fractionation laws govern intraplanetary and interplanetary processes. This permits discriminating between solar
nebular processes and parent-body processes. Oxygen isotopes also serve as a sensitive natural tracer for meteorite classification.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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A unique kinetic isotope effect has been found in the formation process of ozone molecules. Isotope enrichments of about 10%
above statistically expected values were first discovered in atmospheric isotopomers 49O3 and 50O3 and later in many other molecular combinations. Most recently the source of this effect was identified through measurement
of isotope-specific ozone formation rate coefficients which show a large variability of over 50%. Ozone molecule formation
is a complex process since different reaction channels contribute to a specific isotopomer. In addition, fast oxygen isotope
exchange reactions determine the abundance of atomic oxygen participating in ozone formation. The isotope enrichments observed
are both pressure and temperature-dependent and they decrease at pressures above 100 mbar and toward lower temperatures. Ozone
possesses not only one of the most unusual isotope anomalies, it also serves as a mediator by transferring heavy oxygen from
the O2 reservoir to other species. Stratospheric isotope composition of CO2 has been recently measured with high accuracy and a pronounced isotopic signature was found which shows that 17O is preferentially transferred from O3 into CO2.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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The fluxes of O and Fe ions at high heliolatitudes measured by the HiScale instrument on Ulysses reflect the dynamical processes that affect the charged particle populations in the heliosphere. Both the O and Fe ions show
more latitude dependence in the first (solar minimum) orbit to high southern heliolatitudes than during the second (solar
maximum) orbit. The ion fluxes are larger during the solar minimum orbit; the flux levels are influenced by the occurrence
of corotating interaction regions. The Fe/O abundance ratios are found to be similar at 1 AU and at high heliolatitudes.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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郑春满%李效东%王亦菲%王应德%冯春祥 《宇航材料工艺》2005,35(3):7-10
为制备耐高温性能良好的SiC纤维,必须降低纤维中的氧含量,本文详细综述了国内外先驱体转化法制备Sic纤维中降低氧含量的方法,分析了各种方法的优缺点,比较可行有效的方法有电子束/γ射线辐射交联法、高温脱氧法和低度预氧化 热交联法,为制备高性能SiC纤维提供了一些参考。 相似文献