偏心对汽轮机隔板汽封泄漏流动特性的影响
发布时间：2018-01-09 08:07
本文关键词：偏心对汽轮机隔板汽封泄漏流动特性的影响 出处：《润滑与密封》2016年11期 论文类型：期刊论文
【摘要】：当汽轮机转子存在偏心时,隔板汽封间隙内的汽流激振力将发生变化,影响汽轮机组的安全运行。采用计算流体动力学软件,分析转子偏心工况下,某300 MW汽轮机高压缸第二压力级隔板汽封内汽流激振力的变化规律。结果表明:密封的周向压力近似呈余弦规律分布;随着偏心距的增加,隔板汽封内周向压力差逐渐增大;汽封间隙不变时,正向力、切向力和合力皆随着偏心距的增加而增加;在不同汽封间隙下,当转子偏心距相同时,间隙越小汽流激振力就越大。
[Abstract]:When the rotor of steam turbine exists eccentricity, the exciting force of steam flow in the gap of steam seal will change, which will affect the safe operation of steam turbine unit. The calculation fluid dynamics software is used to analyze the rotor eccentricity condition. The variation law of steam flow excitation force in the second pressure stage partition of a 300MW steam turbine's high pressure cylinder shows that the circumferential pressure of the seal is approximately the distribution of cosine law. With the increase of eccentricity, the pressure difference increases gradually. When the seal clearance is constant, the forward force, tangential force and resultant force increase with the increase of eccentricity. When the rotor eccentricity is the same, the smaller the gap, the greater the steam flow excitation force.
【作者单位】： 东北电力大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51576036)
【分类号】：TK263.2
【正文快照】： j縥縥縥课颂岣咂址⒌缁榈男，
本文编号：1400614
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