Effect of temperature on the dynamic performance of C/C composite finger seal

Abstract

The designs of sealing device have prominent influence on the performance of aero-engine. The high temperature environment during the working process of aero-engine also has important influence on the performance of sealing device which is located in the aero-engine. Finger seal has a flexible characteristic and high price performance compared with the other seal devices, thus it gets more attention, and lots of researchers have studied about finger seal’s performance recently. But so far the dynamic performance of finger seal considering temperature effect is not yet analyzed and discussed. Based on this, an equivalent dynamic model based on distributed mass considering temperature effect is proposed in the paper. The effects of environment temperature and heat through friction on the equivalent structural stiffness of finger stick and contact pressure between finger stick and rotor are discussed. Moreover, the data exchange between the dynamic and thermal analysis is confirmed based on the movement relationship between the rotor excitation and finger stick response. Therefore, the dynamic performance analysis of finger seal including thermal-structure coupling is obtained based on an equivalent dynamic method. The effect of temperature on the dynamic performance of finger seal using this model is analyzed, and the effect of C/C composite structural parameters on the finger seal performance is investigated considering the temperature effect. The above results show that the temperature effect has important influence on the performance of finger seal, so it is necessary to consider the temperature effect when the performance of finger seal is analyzed. The current work further improves the theoretical system about finger seal equivalent dynamic research, and has higher academic significance and engineering value.

Keywords

Aero-engine finger seal temperature effect equivalent dynamic model C/C composite

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References

Johnson MC and Medlin EG. Laminated finger seal with logarithmic curvature. Patent no. 5,108,116, USA, 1992.

Proctor MP and Delgado IR. Leakage and power loss test results for competing turbine engine seals. Report no. NASA/TM-2004-213049, 2004.

Proctor

Kumar

Delgado

. High-speed, high-temperature finger seal test results. J Propul Power 2004; 20: 312–318.

Delgado IR and Proctor MP. Continued investigation of leakage and power loss test results for competing turbine engine seals. In: 42th AIAA/ASME/SAE/ASEE joint propulsion conference & exhibit, Sacramento, CA, 9–12 July 2006, paper no. AIAA 2006-4754. Reston: AIAA.

Arora GK and Glick DL. Pressure balanced finger seal. Patent no. 6,196,550, USA, 2001.

Arora GK, Proctor MP, Steinetz BM, et al. Pressure balanced, low hysteresis, finger seal test results. Report no. NASA TM 1999-209191, June 1999.

Gibson NE, Takeuchi D, Hynes T, et al. Second generation air-to-air mechanical seal design and performance. In: 47th AIAA/ASME/SAE/ASEE joint propulsion conference & exhibit, San Diego, CA, 31 July–03 August 2011, paper no. AIAA 2011-5636. Reston: AIAA.

Zhang

Liu

Cui

. The performances optimization of finger seal based on fuzzy game theory. Procedia Eng 2011; 15: 3450–3455.

Zhang

Chai

Zheng

. Numerical analysis of finger seal with grooves on lifting pads. J Propul Power 2015; 31: 805–814.

10.

Braun MJ, Pierson HM and Deng D, et al. Structural and dynamic considerations towards the design of a padded finger seal. In: 39th AIAA/ASME/SAE/ASEE joint propulsion conference, Huntsville, Alabama, 20–23 July 2003, paper no. AIAA 2003-4698. Reston: AIAA.

11.

Braun

Pierson

Deng

. Thermofluids considerations and the dynamic behavior of a finger seal assembly. Tribol T 2005; 48: 531–547.

12.

Marie H. Dynamic simulation of finger seal-rotor interaction using variable dynamic coefficients. In: 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, Sacramento, CA, 9–12 July 2006, paper no. AIAA 2006-4931, pp.5836-5853. Reston: AIAA.

13.

Suo

. Dynamic leakage analysis of noncontacting finger seals based on dynamic model. J Eng Gas Turb Power 2015; 137: 1–7.

14.

Chen

. Dynamic behavior analysis of finger seal based on equivalent dynamic model. Chin J Mech Eng 2010; 23: 590–599.

15.

Chen

. Dynamic analysis of finger seal using equivalent model based on distributed mass method. Proc IMechE, Part C: J Mechanical Engineering Science 2014; 288: 2992–3005.

16.

Chen

Wang

. Dynamic analysis of C/C composite finger seal. Chinese J Aeronaut 2014; 27: 745–758.

17.

Marie H. A study of non-contacting passive-adaptive turbine finger seal performance. PhD Thesis, University of Akron, USA, 2005.

18.

Bhushan

. Introduction to tribology, USA: John Wiley&Sons,Ltd.,publication, 2013, pp. p122–p122.

19.

Polycarpou

Etsion

. Analytical approximations in modeling contacting rough surfaces. J Tribol 1999; 121: 234–239.

20.

Shi

Polycarpou

. Measurement and modeling of normal contact stiffness and contact damping at the meso scale. J Vib Acoust Trans ASME 2005; 127: 52–60.

21.

Zhao

Zhang

Man

. A modified normal contact stiffness model considering effect of surface topography. Proc IMechE, Part J: J Engineering Tribology 2015; 299: 677–688.

22.

Editorial committee. Design handbook of aero-engine, Beijing: Aviation Industrial Publishing House, 2000.