A Numerical Investigation of the Rupture of Pneumatic Lines in Aircraft Engines

Chan, Yong Khang Wilson (2006). A Numerical Investigation of the Rupture of Pneumatic Lines in Aircraft Engines B.Sc Thesis, School of Mechanical and Mining Engineering, The University of Queensland.

       
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Author Chan, Yong Khang Wilson
Thesis Title A Numerical Investigation of the Rupture of Pneumatic Lines in Aircraft Engines
School, Centre or Institute School of Mechanical and Mining Engineering
Institution The University of Queensland
Publication date 2006
Thesis type B.Sc Thesis
Supervisor David Mee
Total pages 88
Language eng
Subjects 0901 Aerospace Engineering
Formatted abstract

This thesis presents the results of an investigation into the consequences of the rupture of a high pressure pneumatic pipe inside the annular nacelle-core area of an aircraft engine. It involves the use of transient compressible flow modelling to obtain peak pressure magnitudes, durations, and locations in a reduced-scale model of the nacelle-core area. The three-dimensional, time accurate CFD program ELMER is employed in this research for the flow simulations. This program was validated against the Simplified Aircraft Engine Model generated by MB_CNS, which has in turn been validated against analytically validated results by Vanderstraeten et al. Results from the present investigation reveal in an event of a pressurised pipe rupture, a blast wave propagates both circumferentially and axially in the reduced-scale model. For the configuration of the reduced-scale model in this research, the highest pressures were recorded at the outer surface of the model cavity. For a pipe rupture pressure of 2.17 MPa, the maximum pressure at the outer surface was 251 kPa. Results also suggest that pressure loadings on the surfaces of the reduced-scale model are the result of the combined effects of blast wave overpressure, the impingement of a jet of high pressure air and the quasi-steady pressurisation of the model. Which of these effects dominates depends on the location within the cavity. The results indicate that the largest pressures on the walls of the cavity are caused by jet impingement, but further experimental and numerical simulations are required to confirm this. 

Keyword Rupture Pneumatic Lines
Aircraft Engines

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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