篦齿结构对封严特性的影响

发布时间：2017-12-27 09:21

  本文关键词：篦齿结构对封严特性的影响　出处：《润滑与密封》2017年10期 　论文类型：期刊论文

  更多相关文章： 直通型篦齿 台阶型篦齿 泄漏系数 压力分布 封严特性

【摘要】：根据旋转机械中常见的篦齿密封结构设计直通型和台阶型2组篦齿密封实验模型,实验研究篦齿密封的封严特性。通过实验和数值方法比较不同进出口压比和节流间隙下2组篦齿密封的封严特性,研究台阶篦齿与衬套轴向相对位置对封严特性的影响,探究篦齿内部沿程压力分布情况。研究结果表明:在密封长度相同的条件下,台阶齿泄漏系数比直通齿降低了约45%;台阶齿对节流间隙变化的敏感性要低于直通齿,表明台阶型篦齿性能稳定性优于直通齿;低压比时泄漏量受台阶篦齿与衬套轴向相对位置的影响很小;在文中条件下当齿尖位于衬套台阶中心位置时,篦齿密封的泄漏量最大;直通型和台阶型篦齿沿程压力系数的分布基本相同,都近似线性降低;与实验结果不同,数值计算结果表明台阶齿在齿尖处存在压力突降,而在齿腔中存在一个压力突峰。
[Abstract]:According to the common labyrinth seal structure in the rotating machinery, the experimental model of 2 groups of labyrinth seal is designed, and the sealing characteristics of the labyrinth seal are studied experimentally. The sealing characteristics of 2 groups of labyrinth seals under different inlet and outlet pressure ratios and throttling gaps are compared by experimental and numerical methods. The influence of axial relative positions of stepped grates and bushings on sealing characteristics is studied, and the pressure distribution inside labyrinth is explored. The results show that: in the same conditions of sealing length, step tooth leakage coefficient was reduced by 45% compared with straight tooth; tooth gap change of throttle sensitivity level is lower than the straight tooth, show that the step type stability performance is better than that of straight tooth tooth comb; low voltage than when leakage affected by the relative position and the axial step labyrinth bushing very small; in the condition when the tip is located in the center position when Bush steps, labyrinth seal leakage; through distribution type and step type labyrinth pressure coefficient is basically the same, linearly decreased; and different experimental results, the numerical results show that the pressure drop in the existing step gear tooth tip but, there is a pressure in the cavity in the peaks.
【作者单位】： 中国科学院工程热物理研究所;
【基金】：国家自然科学基金项目(51522605) 国家重点基础研究发展计划(973计划)项目(2015CB251302) 北京市科技计划项目(D161100004616001;161100004616002) 中国科学院前沿科学重点研究项目(QYZDB-SSW-JSC023)
【分类号】：TH136
【正文快照】： j縥縥縥縥縥縥縥縥，

本文编号：1341098