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高抗气蚀离心泵内流场数值模拟研究(英文) 被引量:1
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作者 姚皞宇 吴大转 +1 位作者 曹琳琳 武鹏 《风机技术》 2019年第6期10-17,I0006,共9页
本文以同一工况下具有相同进出口尺寸的离心泵模型为对象,基于数值模拟的方法研究了子午面轮廓和长短叶片对离心泵的气蚀性能和水力性能影响。遵循抗空化设计准则提出有别于普通离心泵的三种高抗气蚀离心泵,其一具有驼峰型过水断面曲线... 本文以同一工况下具有相同进出口尺寸的离心泵模型为对象,基于数值模拟的方法研究了子午面轮廓和长短叶片对离心泵的气蚀性能和水力性能影响。遵循抗空化设计准则提出有别于普通离心泵的三种高抗气蚀离心泵,其一具有驼峰型过水断面曲线,最大值在叶片前缘处以降低前缘冲击损失,减少空化影响。其二采用诱导轮叶轮一体化设计,安置分流叶片,长叶片在进口处螺旋形前伸,提前做功,使低压点前移。其三结合以上两种设计手段综合提高抗气蚀性能。采用多相流CFD模型预测三种模型泵在设计工况下的气蚀性能叶片载荷与气液两相分布间,并在无量纲空化数下分析了其气蚀性能。结果显示进口延长的螺旋形长叶片形成了类似诱导轮的效果,降低了整个叶轮对空化影响的敏感性。另一方面,单纯地扩展子午面流道虽然可以显著提高扬程与空化性能,但是却对整体效率产生了不利影响。 展开更多
关键词 气蚀性能 冲击损失 诱导轮 水力性能 子午面 长叶片 CFD模型 抗气蚀
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Histone modifications in DNA damage response 被引量:4
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作者 lin-lin cao Changchun Shen Wei-Guo Zhu 《Science China(Life Sciences)》 SCIE CAS CSCD 2016年第3期257-270,共14页
DNA damage is a relatively common event in eukaryotic cell and may lead to genetic mutation and even cancer. DNA damage induces cellular responses that enable the cell either to repair the damaged DNA or cope with the... DNA damage is a relatively common event in eukaryotic cell and may lead to genetic mutation and even cancer. DNA damage induces cellular responses that enable the cell either to repair the damaged DNA or cope with the damage in an appropriate way. Histone proteins are also the fundamental building blocks of eukaryotic chromatin besides DNA, and many types of post-translational modifications often occur on tails of histones. Although the function of these modifications has remained elusive, there is ever-growing studies suggest that histone modifications play vital roles in several chromatin-based processes, such as DNA damage response. In this review, we will discuss the main histone modifications, and their functions in DNA damage response. 展开更多
关键词 DNA damage response histone modifications CHROMATIN DNA repair
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