Fluid-structure interaction and vibration analysis of the fuel system of a turbofan engine with optimal dimensions

Document Type : Research Article

Authors

1 Associate Professor, Mechanical Engineering Faculty, Imam Hossein Comprehensive University, Tehran, Iran.

2 M.Sc. Graduate, Mechanical Engineering Faculty, Imam Hossein Comprehensive University, Tehran, Iran.

Abstract

This paper investigates the main problem of combustion instability in turbofan engines which is usually the unbalanced fuel pump causing turbulences in the fuel flow as well as vibrations in the fuel pipes of the system.At first, the equations of frequencies are derived analytically in the direct and knee joint pipes to verify the results of the Abaqus software. The results show an acceptable accuracy of the Abaqus software to solve the problem of the fluid coupling structure. The results show that the vibration frequency of this part of the fuel transfer system (2.5 to 18 Hz in different modes) is very low compared to the entire engine operational frequency (around 140 Hz). The maximum transverse displacement (range) is relatively significant (up to 16 mm), which is noticeable with respect to the overall dimensions of the system. However, this amplitude would decrease by two clamped-ended with two fastened belts. In the following part, optimization of the system parameters was done using the Design-expert Software and NSGA II code. The basic parameters studied in this paper are radius, thickness, and length of the pipe with different spans, as well as the turbulence inflow. Optimal mode is achieved with laminar velocity contours. In conclusion, the outflow disturbance has been decreased, which consequently reduces the turbulence of the fuel that can improve combustion stability

Highlights

  • Vibration analysis of a turbofan fuel system is presented in this article.
  • The FSI analysis with certain conditions are solved by Abaqus software.
  • Parameter optimization is done by Design-expert Software and NSGA II code.
  • Radius, thickness, pipe length (various spans) and turbulence inflow are investigated.
  • Optimal mode achieved by laminar outflow is shown using fluid velocity contours.

Keywords

Main Subjects

References

[1] H.J.-P. Morand, R. Ohayon, Fluid structure interaction-Applied numerical methods, Wiley, 1995.
[2] E.H. Dowell, K.C. Hall, Modeling of fluid-structure interaction, Annual review of fluid mechanics, 33 (2001) 445-490.
[3] C. Michler, S.J. Hulshoff, E.H. Van Brummelen, R. De Borst, A monolithic approach to fluid–structure interaction, Computers & fluids, 33 (2004) 839-848.
[4] S. Chakrabarti, Hybrid numerical method for wave–multibody interaction, WIT Transactions on State-of-the-art in Science and Engineering, 18 (2005).
[5] G. Hou, J. Wang, A. Layton, Numerical methods for fluid-structure interaction—a review, Communications in Computational Physics, 12 (2012) 337-377.
[6] B.M. Tashakori, M.R. Elhami, A.R. Rabiee, Numerical Analysis of Fluid Structure Interaction Phenomenon on a Turbine Blade, (2016).
[7] I.R. Dubyk, I.V. Orynyak, Fluid-structure interaction in free vibration analysis of pipelines, Вісник Тернопільського національного технічного університету, 81 (2016) 49-58.
[8] S. Moore, A review of noise and vibration in fluid-filled pipe systems, Proceedings of the Acoustics, Brisbane, Australia, (2016) 9-11.
[9] K.S. Fong, A.Y.M. Yassin, Fluid-structure interaction (FSI) of damped oil conveying pipeline system by finite element method, in:  MATEC Web of Conferences, EDP Sciences, 2017, pp. 01005.
[10] S. Olsson, J. Kesti, Fluid structure interaction analysis on the aerodynamic performance of underbody panels, in, 2014.
[11] R.S. Raja, Coupled fluid structure interaction analysis on a cylinder exposed to ocean wave loading, (2012).
[12] H. Yi-Min, L. Yong-Shou, L. Bao-Hui, L. Yan-Jiang, Y. Zhu-Feng, Natural frequency analysis of fluid conveying pipeline with different boundary conditions, Nuclear Engineering and Design, 240 (2010) 461-467.
[13] S.s. Chen, Vibration and stability of a uniformly curved tube conveying fluid, The Journal of the Acoustical Society of America, 51 (1972) 223-232.
[14] M.R. Ghazavi, H. Molki, Nonlinear vibration and stability analysis of the curved microtube conveying fluid as a model of the micro coriolis flowmeters based on strain gradient theory, Applied Mathematical Modelling, 45 (2017) 1020-1030.
[15] A. Kharestani, Vibration analysis and study of FSI in engine fuel system for
combustion stability in a turbofan, in:  , Mech. Eng. Dept., IHU (in Persian), 2018.
Journal of Theoretical and Applied Vibration and Acoustics
Volume 6, Issue 2
July 2020
Pages 281-300

Files

Share

How to cite

Statistics