共查询到19条相似文献,搜索用时 156 毫秒
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波纹管作为核二级截止阀的重要部件,其良好的密封性能是保证核二级波纹管截止阀在工作时可以做到阀杆密封处零泄漏的重要前提。因此在工作载荷下对波纹管进行稳定性研究以及确定结构失稳的临界载荷的屈曲分析就显得十分必要。基于ANSYS Workbench软件分析了核二级波纹管截止阀用U型波纹管在确定位移的情况下,不同间隙波纹管的屈曲载荷变化;在确定间隙的情况下,波纹管在不同拉压位移作用时的屈曲载荷变化。结果表明:波纹管在承受压缩位移的时候,随着压缩位移的减小其屈曲载荷逐渐增大;波纹管在承受拉伸位移的时候,随着拉伸位移的逐渐增大其屈曲载荷先增大后减小。波纹管在确定的外压及拉压位移的作用下,随着波纹管层间隙的逐渐增大,波纹管的屈曲载荷先增大后减小。 相似文献
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金属波纹管膨胀节作为一个特殊的管道部件,用来补偿管道或设备因温度引起的热位移,在工程中得到了广泛应用。介绍了波纹管补偿器的类型、支架设置、安装和使用要求,在工程应用中,应根据实际情况选择合适的波纹管膨胀节。 相似文献
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针对茂名石化高温泵用两种密封形式——单端面接触式机械密封和串联非接触式机械密封,从波纹管的角度出发,通过软件模拟得到了不同密封形式下波纹管温度场的分布,从而确定了波纹管的主要失效部位及主要影响因素。此外,计算结果表明串联非接触式机械密封在能满足波纹管工业应用的前提下,还能在很大程度上降低冲洗液的消耗,实现节能环保的要求,对高温泵密封的改造、使用提供指导。 相似文献
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哈氏合金C276管道焊接残余应力与变形的有限元分析 总被引:1,自引:0,他引:1
针对哈氏合金C276焊接特点,运用有限元分析软件ABAQUS,对哈氏合金C276管道多道焊残余应力进行了有限元模拟。利用单元生死技术,模拟焊缝金属的形成;利用FORTRAN语言编写子程序DFLUX,实现了移动的高斯分布热源;考虑对流、传导、辐射以及高温下的材料性能,获得了残余应力和变形的分布规律。计算结果表明,在焊缝及热影响区,轴向拉应力对内壁裂纹的产生有主要的影响,环向拉应力对外壁裂纹的产生有主要的影响。线能量对温度和变形的影响较大,而对残余应力影响不大。 相似文献
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Slag or ash removal from water wall tubes in a radiant syngas cooler (RSC) is a routine task in operation, which can effectively increase the overall thermal efficiency. Rapping ash removal is one of the valid methods for shedding off the ash deposits in the high-pressure surroundings of the RSC. In this study, the model of a real RSC was established by a numerical simulation based on the finite element software ABAQUS, and modal analysis and instantaneous response analysis (IRA) were researched to reveal the natural vibration characteristics of the RSC and aid the design of rapping ash removal. On the basis of the results of natural vibration characteristics and a subsequent harmony response, 16 Hz was set as the impact frequency, balancing off the vibrator number and the water-tube displacement effect. It was indicated that ash deposit in the area around 1/2 longitudinal position was easy to remove due to great response to rapping action. Moreover, rapping at ½ position generally obtained greater displacement response in the whole RSC. A rapping design was proposed with six vibrators at the ½ longitudinal position and 16 Hz frequency, and then two rapping intervals were investigated comparatively. The case with a half-cycle interval had a slightly larger response than the one-cycle case, with a larger displacement in more circumferential tubes as well as with a greater sound pressure response in the RSC. 相似文献
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开孔金属泡沫内流动特性的研究多局限于局部流动特性的分析,大尺寸(100cm2以上)金属泡沫内气液两相宏观流动特性的研究目前较为缺乏。为了深入认识金属泡沫内气液两相流动特性,本文通过光学可视化手段,对金属泡沫多孔介质薄层内的气/液驱替、液/气驱替两相流动过程进行研究,分析了入侵流体的流速及金属泡沫的孔径对泡沫薄层内两相流动的影响。结果表明:在气/液驱替流动方面,随着空气流速的增大,气液两相的界面形态由毛细指状结构过渡到黏性指状结构,随着泡沫孔径的减小,部分排水现象愈加显著;在液/气驱替流动方面,气液界面较为规则,近似呈锥形,且流速越大,界面锥角越大、长度越小,试验中仅在最小孔径的金属泡沫中捕捉到明显的部分驱替现象,并且随着水流速的减小愈加显著。 相似文献
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