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压力容器封头超标大开孔结构分析与试验研究 总被引:6,自引:0,他引:6
本文通过理论分析了压力容器封头超标大开孔的可行性及安全性,并用实验手段验证了这种结构的安全可靠性。该结构经过适当补强后是安全的,在国内外均有应用实例。 相似文献
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对球形封头上不同开孔率的接管在内压作用下的应力分布进行了有限元分析计算,对接管根部表面及内部各点的弹性应力采用各种不同精度的有限元网格得出的计算值进行了对比分析,并且对接管根部各载面进行了应力线性化处理,得出了不同精度的网格和接管极部不同的过渡形式下的薄膜应力分成,弯曲应力成分和峰值应力成分,分析研究了接管根部不同的过渡形式对薄膜应力集中,薄膜加弯曲应力集中和表面应力集中的影响及不同精度的网络对这些应力集中计算精度的影响。 相似文献
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从凸形封头的壁厚设计原理、开孔补强准则和有关容器规范的制订依据出发,分析了对凸形封头是否必须限制其开孔位置的依据,认为按照主要参照ASMEⅧ-1的我国现行容器规范封头设计公式和等面积补强准则,在区别开孔所在位置并按封头在该处的计算壁厚进行补强设计之后,并无必要对开孔位置进行限制;而若采用除等面积补强之外的其它补强准则,则应根据各准则的制订依据对开孔位置进行限制;并认为凸形封头的危险区并非在顶部而是在转角过渡区,不加具体分析、笼统地认为可以或不可以在转角过渡区开孔是不妥当的。 相似文献
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医用氧舱壳体封头矩形大开孔有限元分析计算 总被引:1,自引:0,他引:1
医用氧舱封头矩形大开孔的尺寸超出GB150-1998《钢制压力容器》的开孔和补强计算的适用开孔范围。本文给出了有限元计算和分析,应力和应变在允许范围之内。 相似文献
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介绍复杂的正天圆地方偏斜锥面接管开孔的展开放样原理 ,并运用微机放样 ,降低了劳动强度 ,提高了工作效率和放样准确度。 相似文献
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The dissolution of a single stationary bubble held in place by a horizontal plate is commonly observed experimentally. For several decades the standard approach to the analysis of such dissolution data has been to apply a correction factor of ln(2)=0.69 to the Epstein-Plesset equation for an isolated bubble. In this paper, the transport equations for a stationary bubble touching a plate are solved numerically for the common case where the flow field caused by the change in system volume as the bubble dissolves can be neglected. It is found that the total bubble lifetime is not well characterised by the use of the ln(2) factor. However, in most experimental situations, the initial stages of bubble dissolution are not captured. For low gas solubilities the use of a correction factor of 0.69 to the Epstein-Plesset equation is appropriate once the initial transients have dissipated. The correction factor varies from 0.69 to 0.77 across the full range of situations described in this paper. The mathematical model is validated by comparison to experimental data. 相似文献
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The phenomenon of drop formation at a single plain hole and a single nozzle hole in a plate submerged in a quiescent continuous phase is studied by carrying out numerical simulations. Phase-field method has been used for tracking the evolution of the interface between the drop phase and the continuous phase. The computational approach used in the numerical simulations is validated using the data reported in literature. The validated computational approach is then used for parametric analysis to understand the effects of various independent variables on the phenomenon of drop formation. For identical conditions, the drops formed at a nozzle hole are found to be smaller than the drops formed at a plain hole. The drop detachment time is more for a plain hole than for a nozzle hole. The drop detachment height is, however, more for a nozzle hole than for a plain hole. Correlations to estimate drop diameter for both types of holes are presented. 相似文献
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以某进口的板翅式换热器为例 ,建立了板翅式换热器封头的强度计算公式 ,并应用于板翅式换热器的检验。所讨论的内容可作为该类换热器强度安全性检验的参考 ,并可为该类型换热器安全性评估的进一步研究提供理论基础。 相似文献
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对当前硫酸厂在使用纤维除雾器的过程中所遇到的堵塞、腐蚀、纤维塌陷等问题进行探讨并提出相应的解决方法。在纤维层外覆盖一层透气性好、耐硫酸腐蚀的滤布可有效防止尘粒堵塞纤维床,根据具体情况选用适当的材料并采用加固的钢板网结构可减轻腐蚀,改进纤维的缠绕方式可避免纤维塌陷。 相似文献