[1]方志,李志刚,李军.孔型参数对流体孔型密封泄漏特性和转子耗功的影响[J].西安交通大学学报,2020,54(09):081-88.[doi:10.7652/xjtuxb202009009]
 FANG Zhi,LI Zhigang,LI Jun.Effects of Hole Depth and Diameter on the Leakage Characteristics and Rotor Power Loss of Liquid Hole-Pattern Seals[J].Journal of Xi'an Jiaotong University,2020,54(09):081-88.[doi:10.7652/xjtuxb202009009]
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孔型参数对流体孔型密封泄漏特性和转子耗功的影响
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《西安交通大学学报》[ISSN:0253-987X/CN:61-1069/T]

卷:
54
期数:
2020年第09期
页码:
081-88
栏目:
出版日期:
2020-09-10

文章信息/Info

Title:
Effects of Hole Depth and Diameter on the Leakage Characteristics and Rotor Power Loss of Liquid Hole-Pattern Seals
文章编号:
0253-987X(2020)09-0081-08
作者:
方志1 李志刚1 李军12
1.西安交通大学能源与动力工程学院, 710049, 西安; 2.先进航空发动机协同创新中心, 100191, 北京
Author(s):
FANG Zhi1 LI Zhigang1 LI Jun12
1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China; 2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China
关键词:
流体孔型密封 孔深 孔径 泄漏特性 转子耗功
Keywords:
liquid hole-pattern seal hole depth hole diameter leakage characteristics rotor power loss
分类号:
TK476
DOI:
10.7652/xjtuxb202009009
文献标志码:
A
摘要:
为评估孔型密封在液体透平机械动静间隙的封严效果,明确液体工质下孔型密封设计中关键几何参数孔深、孔径选取准则,采用基于动网格技术的网格自动生成方法和基于三维定常雷诺时均Navier-Stokes(RANS)方程的孔型密封泄漏流动数值计算方法,研究了液体工质下孔型几何参数孔深、孔径对孔型密封泄漏特性和转子耗功的影响规律。计算分析了2种转速(2 000,6 000 r/min)、5种孔径(3,6,9,12,16 mm)下孔深在0.5~15 mm范围连续变化时,液体孔型密封的泄漏量、转子耗功以及孔腔流场结构,并与实验结果进行了对比。结果表明:所采用的数值方法能够准确预测液体孔型密封泄漏量; 液体孔型密封泄漏量随转速增大而线性减小; 深径比(孔深与孔径之比)对孔腔内涡系结构具有显著影响,是影响液体孔型密封泄漏量的关键参数; 随孔深径比增加,液体孔型密封泄漏量先减小后增大; 存在最佳孔深径比范围0.5~0.6,此时液体孔型密封泄漏量最小; 不同孔径下,液体孔型密封转子耗功随孔深径比的增加而急剧减小。
Abstract:
To evaluate the sealing performance of the hole-pattern seals in liquid turbomachines and provide a comprehensive selection criterion of the critical geometry parameters(hole depth and hole diameter)for the design of liquid hole-pattern seals, the mesh auto-generation method and numerical solution method for the prediction of the steady leakage flow in the hole-pattern seals were proposed and validated using the 3D steady Reynolds-averaged Navier-Stokes(RANS)equations. The influences of the hole depth and hole diameter on the seal leakage characteristics and rotor power loss were numerically investigated for a hole-pattern seal of water fluid. The leakage flow rate, rotor drag torque, and flow fields in the hole cavities were calculated and analyzed for liquid hole-pattern seals with various hole depths(H=0.5 - 15 mm)and five hole diameters(D=3, 6, 9, 12, 16 mm)at two rotational speeds(n=2 000, 6 000 r/min). Numerical results show that the present numerical methods possess better accuracy for the prediction of leakage flow rate of the liquid hole-pattern seal. The leakage flow rate of the liquid hole-pattern seal decreases linearly with the rotational speed. From a view of seal leakage performance, the ratio of hole depth to hole diameter(AR), which significantly influences the structure of the vortex system in the hole cavity, is the most critical design parameter for liquid hole-pattern seals. With the increase of AR, the leakage flow rate firstly decreases and then increases. There is an optimum region for AR(0.5 - 0.6), where the liquid hole-pattern seal possesses the best sealing performance with minimum leakage. For the liquid hole-pattern seals with different hole diameters, the rotor power loss obviously decreases with the increase of AR.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2020-03-13。作者简介: 方志(1994—),男,博士生; 李志刚(通信作者),男,副教授,博士生导师。基金项目: 国家重点研发计划资助项目(2017YFB0601804); 国家自然科学基金资助项目(51776152)。
更新日期/Last Update: 2020-09-10