CBL - Campus del Baix Llobregat

Projecte llegit

Títol: Bellmouth design for rig testing of a micro turbojet

Estudiants que han llegit aquest projecte:

Director/a: MELLIBOVSKY ELSTEIN, FERNANDO PABLO

Departament: FIS

Títol: Bellmouth design for rig testing of a micro turbojet

Data inici oferta: 22-07-2025     Data finalització oferta: 22-03-2026


Estudis d'assignació del projecte:
    GR ENG SIST AEROESP
Tipus: Individual
 
Lloc de realització: EETAC
 
Paraules clau:
Bellmouth, EvoJet B107, Computational Fluid Dynamic (CFD), k-omega SST model, boundary layer, velocity profile
 
Descripció del contingut i pla d'activitats:
 
Overview (resum en anglès):
This bachelor's thesis presents the aerodynamic redesign and computational analysis of a bellmouth intake for the EvoJet B170 microturbojet engine. The project works upon a previous design which is functional, but has a critical aerodynamic flaw: the generation of supersonic flow velocities in the annular gap between the intake wall and the engine's central starter housing. This phenomenon led to shock waves, flow distortion and potential structural risks.

The primary objective of this study was to eliminate these supersonic zones and ensure a uniform, subsonic velocity profile at the compressor face. Using Computational Fluid Dynamic (CFD) simulation in ANSYS, the original geometry was analyzed to identify the choking mechanisms. A new bellmouth configuration was designed, with an expanded section close to the inlet of the engine that increases the effective cross-sectional area while maintaining compatibility with the engine's fixed interface.

Comparison between 2D and 3D CFD simulation validated the updated design. The results demonstrate that the optimized geometry success fully mitigates flow choking, maintaining subsonic velocities even under maximum mass flow condition. And related to the boundary layer analysis, conducted with the k-omega SST model in 2D simulations, confirms that the flow remains attached despite the area expansion. The design provides an accurate velocity profile solution at the Pitot tube location with low error. This ensures reliable and accurate measurements for engine testing.

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