Validation of Two-Control-Volume Bulk Flow Method for Rotordynamic Characteristics of Hole-Pattern Seals

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Validation of Two-Control-Volume Bulk Flow Method for Rotordynamic Characteristics of Hole-Pattern Seals

更新时间：2025-05-08

- Validation of Two-Control-Volume Bulk Flow Method for Rotordynamic Characteristics of Hole-Pattern Seals
- Vol. 43, Issue 1, Pages: 24-28(2009)
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK262
- Online First：10 January 2009，
  
  Published：2009
- 稿件说明：
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Validation of Two-Control-Volume Bulk Flow Method for Rotordynamic Characteristics of Hole-Pattern Seals[J]. 2009, 43(1): 24-28.
DOI：

Validation of Two-Control-Volume Bulk Flow Method for Rotordynamic Characteristics of Hole-Pattern Seals[J]. 2009, 43(1): 24-28. DOI：

摘要

基于Kleynhans和Childs的两控制容积等温BF(Bulk Flow)模型

通过增加能量方程和理想气体状态方程

建立了理想气体BF方法的数学模型

来预测和分析孔型密封转子在偏心状态下的静力学和动力学特性.由于转子在密封中心附近做微小涡动

故可通过采用摄动方法使得NS方程的求解过程得到较大的简化

再通过迭代求解简化后的零阶和一阶摄动方程组

就可以求出孔型密封的流场和动力特性系数.以此为依据发展了相关程序

计算出了不同工况条件下孔型密封的转子动力特性系数与激振频率的关系

通过与已有的实验数据和等温BF模型的计算结果进行对比

验证了理想气体BF模型及相关求解方法的有效性.结果表明:理想气体BF模型的预测结果与实验数据吻合良好

且优于等温BF模型的计算结果

证明了该理想气体BF模型的正确性和计算方法的可靠性.该方法可用于孔型密封动力特性的预测.

Abstract

An ideal gas bulk flow model was established based on the two-control-volume isothermal bulk flow model developed by Kleynhans and Childs. A computational analysis was performed for prediction of the static and dynamic performance of gas annular hole-pattern seals at eccentric rotor conditions. The computational process was simplified by applying the perturbation method for small amplitude rotor excursion about an off-centered position. The flow field and rotordynamic coefficients were obtained by iteratively solving the simplified zeroth-order and first-order perturbation equations. The relations between the rotordynamic coefficients and excitation frequency were also calculated with the codes developed under different boundary conditions and geometrical sizes. The results obtained with the present method are well in agreement with the experimental data and more accurate than those with the isothermal bulk flow method. These findings confirm that the present method can be adopted to predict the rotordynamic characteristics of the hole-pattern seal.

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references

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YU Z, CHILDS D W. A comparison of experimental rotordynamic coefficients and leakage characteristics between hole-pattern gas damper seals and a honeycomb seal [J]. ASME J Eng Gas Turbines Power, 1998, 120(4): 778-783.

CHILDS D W, WADE J. Rotordynamic-coefficient and leakage characteristics for hole-pattern-stator annular gas seals:measurements versus predictions [J]. ASME Journal of Tribology, 2004, 126(2): 326-333.

KLEYNHANS G F, CHILDS D W. The acoustic influence of cell depth on the rotordynamic characteristics of smooth-rotor/honeycomb-stator annular gas seals [J]. ASME J Eng Gas Turbines Power, 1997, 119(4): 949-957.

SHIN Y S, CHILDS D W. The impact of real gas properties on predictions of static and rotordynamic properties of the annular gas seals for injection compressors [C/CD]∥Proceedings of the ASME Turbo Expo 2007. Montreal, Canada: ASME, 2007:GT2007-27293.

HIRS G. A bulk-flow theory for turbulence in lubricating films [J]. ASME Journal of Lubrication Technology, 1973, 95:137-146.

SHIN Y S. Modifications to a two-control-volume, frequency dependent transfer: function analysis of hole-pattern gas annular seals [D]. Texas, USA: Texas AM University. College Station,2005.

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