Abstract

The coupling fluid flow-thermal model of natural convection heat in a High-Pressure Rotor (HPR) of the aero engine was established with Computational Fluid Dynamics (CFD) method. The temperature distributions and flow fields of the HPR with different shutdown time were studied. Then, the temperature distributions of the HPR during the hot start-up with different shutdown time were calculated. Moreover, the effects of hot start-up and shutdown temperature fields on the critical speeds of the HPR were carried out. The results show that the flow rule in the cavity of HPR is different from that in a quadrate cavity and presents diversity and complexity of flow. During 40-90 min of shutdown time, the temperature difference of the HPR is more than 20°C. When the shutdown time reaches to 60 min, the first critical speed of the HPR is decreased by 22.3% from 2256 to 1768 rpm.

Keywords:

Aero-engine, CFD, High-Pressure Rotor (HPR), hot startup process, natural convection heat, thermal vibration,

References

1. Aounallah, M., Y. Addad, S. Benhamadouche, O. Imine, L. Adjlout et al., 2007. Numerical investigation of turbulent natural convection in an inclined square cavity with a hot wavy wall. Int. J. Heat Mass Tran., 50(9-10): 1683-1693.
   CrossRef    
2. Atayilmaz, S. and I. Teke, 2010. Experimental and numerical study of the natural convection from a heated horizontal cylinder wrapped with a layer of textile material. Int. Commun. Heat Mass, 37(1): 58-67.
   CrossRef    
3. Atmane, M.A., V.S. Chan and D.B. Murray, 2003. Natural convection around a horizontal heated cylinder: The effect of vertical confinement. Int. J. Heat Mass Tran., 46: 3661-3672.
   CrossRef    
4. Basak, T., S. Roy, T. Paul and I. Pop, 2006. Natural convection in a square cavity filled with a porous medium: Effects of various thermal boundary conditions. Int. J. Heat Mass Tran., 49(7-8): 1430-1441.
   CrossRef    
5. Dong, S.F. and Y.T. Li, 2004. Conjugate of natural convection and conduction in a complicated enclosure. Int. J. Heat Mass Tran., 47(10-11): 2233-2239.
   CrossRef    
6. Girgis, I.G., 2000. Numerical and experimental investigations of natural convection in inclined air enclosures. AIAA J., 1: 10-13.
   CrossRef    
7. Kimura, S., A. Okajima and T. Kiwata, 1998. Conjugate natural convection from a vertical heated slab. Int. J. Heat Mass Tran., 41(15): 3203-3211.
   CrossRef    
8. Mamun, A.A., Z.R. Chowdhury and M.A. Azim, 2008. Conjugate heat transfer for a vertical flat plate with heat generation effect. Nonlinear Anal. Model, 13(2): 213-223.
   
9. Mamun, M., S.C. Paul and M.A. Hossain, 2009. Natural convection flow from a horizontal circular cylinder with uniform heat flux in presence of heat generation. Appl. Math. Model., 33(7): 3226-3236.
   CrossRef    
10. Mendez, F. and C. Trevino, 2000. The conjugate conduction natural convection heat transfer along a thin vertical plate with non-uniform internal heat generation. Int. J. Heat Mass Tran., 43(12): 2739-2748.
    CrossRef    
11. Sankar, M. and Y. Do, 2010. Numerical simulation of free convection heat transfer in a vertical annular cavity with discrete heating. Int. Commun. Heat Mass, 37(6): 600-606.
    CrossRef    
12. Sharifa, M.A.R. and W. Liu, 2003. Numerical study of turbulent natural convection in a side-heated square cavityat various angles of inclination. Numer. Heat Tr. A-Appl., 43(7): 693-716.
    
13. Wang, G., M. Zeng, Z.P. Huang and Q.W. Wang, 2007. Numerical study of natural convection heat transfer in a porous cavity under time periodic boundary conditions. Chinese J. Comput. Phys., 24(3): 282-286.
    
14. Zhang, L., 2008. Analysis of typical aeroengine vibration fault related to thermal bending rotor. J. Vib. Shock, 27(s): 7-9.
    
15. Zhu, X.Z., H.Q. Yuan and W. He, 2007. Effect of steady thermal field on critical speeds of a rotor system. J. Vib. Shock, 26(12): 113-116.
    
16. Zhu, X.Z., H.Q. Yuan and L. Dong, 2010. Friction thermal effect on rubbing response of a high pressure rotor system. J. Propul. Technol., 37(3): 366-371.
    

Competing interests

The authors have no competing interests.

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