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81.
利用计算流体力学软件FLUENT 6.3.26中的拉格朗日离散相模型研究了降雨条件下翼型的气动特性变化,并应用UDF(用户自定义函数)对FLUENT中自带的Wilcox转捩模式进行了修正,对降雨对翼型气动性能的影响机理进行了研究.结果表明,在降雨条件下,翼型表面积聚的水膜层及其表面粗糙度会影响翼型表面的光洁度,引起边界... 相似文献
82.
CHEN Guodinga SUN Hengchaoa WANG Junb aSchool of Mechanical Engineering Northwestern Polytechnical University Xi’an China bAVIC Commercial Aircraft Engine Co. Ltd Shanghai China 《中国航空学报》2011,(3):355-362
The lubrication design and heat transfer determination of bearing chambers in aeroengine require a sufficient understanding of the oil droplet-film interaction and physical characteristic in an oil/air two-phase flow state.The analyses of oil droplet movement,mass and momentum transfer during the impingement of droplet/wall,as well as wall oil film thickness and flow velocity are very important for the bearing chamber lubrication and heat transfer calculation.An integrated model in combination with droplet movement,droplet/wall impact and film flow analysis is put forward initially based on the consideration of droplet size distribution.The model makes a contribution to provide more practical and feasible technical approach,which is not only for the study of droplet-film interaction and physical behavior in bearing chambers with oil/air two-phase flow phenomena,but also useful for an insight into the essence of physical course through droplet movement and deposition,film formation and flow.The influences of chamber geometries and operating conditions on droplet deposition mass and momentum transfer,and wall film thickness and velocity distribution are discussed.The feasibility of the method by theoretical analysis is also verified by the existing experimental data.The current work is conducive to expose the physical behavior of wall oil film configuration and flow in bearing chamber,and also significant for bearing chamber lubrication and heat transfer study under oil/air two-phase flow conditions. 相似文献
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陈书华%刘钧%曾竟成 《宇航材料工艺》2006,36(1):45-48
通过模具材料的选择、分型和模具中加热装置的合理设计,制备出树脂膜熔渗工艺(RFI)实验用FRP模具。实验发现:自带加热系统可将模具和产品加热到110℃以上,模具可在85℃左右长期工作,并初步探索了RFI工艺参数,制备出了性能优异的板材。为制备大型RFI工艺用FRP模具提供了依据。 相似文献
87.
采用国产含氟乳液为基料,研究了辅料的种类和用量,涂料的组成及工艺参数对涂膜性能的影响,提出了能获得良好涂膜的NH-93型氟涂料的配方和成膜条件。 相似文献
88.
Diane Sonya Wong Ryan Chornock Alexei V. Filippenko 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2006,38(12):2813-2815
We present results of optical follow-up observations of candidate ultra-luminous X-ray sources (ULXs). Using Keck optical spectroscopy, 17 of the candidates from the Colbert and Ptak [Colbert, E.J.M., Ptak, A.F. A catalog of candidate intermediate-luminosity X-ray objects. ApJS 143, 25–45, 2002] catalog have been identified; this is one of the largest sets of optical identifications of such objects thus far. Fifteen are background active galactic nuclei (AGN); two are foreground stars in our Galaxy. These findings are consistent with background and foreground object expectations, as derived from log N–log S relations. Also, the results are briefly discussed in terms of the spiral-galaxy/ULX connection. 相似文献
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Carbon-carboncomposites(C/C)exhibitexcellentstructuralpropertiesabove165OC,andareconsideredasthemostpromisingcandidatematerialsforthehighthrust-weightratioturbineengines.Asakeytechnologyforthehigh-temperaturestructuralapplicationsofC/C,oxidationprotectionispaidmoreandmoreattentionrecently.TheoxidationprotectionllfeofacoatedC/Cisdeterminedbyenvironmenta1temperature,becauseitnotonlydecidesthether-mochemicalconditionsofinterfacesinacoating,butalsocontrolsthedynamicprocessofoxy-gendiffusion.The… 相似文献