Development of Computational Fluid Dynamics Methodology to predict the two-phase flow in Aero-Engine Bearing Chamber

The primary role of the lubrication system of aero-engines is to remove the excess heat generated by the movement of the bearings, gears and shafts. As a part of the lubrication system, an aero-engine has bearing chambers whose principal function is containing oil and preventing oil leakages. Inside the bearing chamber is found a mixture of air-oil. The analysis of this air-oil mixture inside bearing chambers is of great interest to reduce the oil consumption, avoids oil leakages and overheating. The overheating of bearing chambers might be generated due to long oil residence time.

Numerical Strategies for air-oil mixture in aero-engine deaerators

In aero-engines, oil is injected for lubrication and cooling of the shaft bearings. During this process, air is sucked and mixed with oil. Air/oil separators scavenge oil and expurgate air from the mix. In the process of improving the efficiency of air/oil phase separator design, our industrial partner “P&W Canada” needs accurate numerical strategies to model the air/oil mixture. These numerical tools would allow an accurate prediction of air-oil flow behavior inside the phase separator depending on its geometry and operating conditions.

Investigation of bubbly oil flows (air-oil) in circular pipes

Pratt and Whitney Canada (P&WC) wishes to optimize the design of the air-oil separator in their turbine engines. Many pipes and tubes lead to and from the air-oil separator and it is important for P&WC to understand how air and oil flow within these pipes. The current project will use a recently developed experimental technique involving cameras and a laser to characterize the patterns of air-oil flow in transparent pipes.

Modeling and Validation of the Oil Control Ring Performance for Orbiting Face-Sealing Applications

The Wankel rotary engine has long been seen as a good engine for aeronautical application, but sealing problems is still a challenge that limits its utilisation. Minimizing oil consumption in rotary engine is essential to limit hydrocarbon emissions and minimize overall mass of the engine. Internal oil leaks from the crankcase to the combustion chamber represent about half the oil consumptions in rotary engines and thus represent the low hanging fruit to minimize oil consumptions. This project aims at improving oil sealing of the rotary engine to enable its use in aircraft applications.

Data fusion strategies for reducing the uncertainty of point cloud data

For decades, contact probes on coordinate measuring machine (CMM) have been widely used for data acquisition in coordinate metrology, mainly because of their high accuracy. However, the acquired data is a low-density set of points, because sampling using a contact probe is a slow process. Nowadays, optical 3D scanning technologies such as structured-light scanners or laser scanners are increasingly included in metrology applications for rapidly capturing high-density point clouds enabling holistic measurements of a manufactured part.

oN DuTy! – Innovative Program on NonDestructive Testing (NDT) – Part 2

NonDestructive Testing (NDT) is a key discipline in major industrial sectors to ensure quality and safety. Several methods are regularly employed in areas ranging from x-ray or ultrasound testing of metallic or composite components in the automotive and aerospace industries, to the inspection of petrochemical ducts using eddy currents or acoustical emissions. The present proposal combines different NDT-related subjects under the oN DuTy!

Development of Computational Fluid Dynamics Methodology for Management of Oil Tanks and the Separation of Air and Oil in an Aero-Engine

Oil is used in aircraft engine applications to lubricate and carry the associated parasitic heat generated away from the moving components. Inefficient lubrication can cause an increase of heat transferred to the metal components by friction while too much oil can cause an increase of the heat generation by churning. The churning of oil leads to the entrainment of air. Oil temperature rise leads to generation of foam.

Création de stratégies démonstratrices hybrides de conception et fabrication d'outillages aérospatiaux

La fabrication de pièces aérospatiales présente plusieurs défis importants, dont ceux du délai et du coût de réalisation. Dans le contexte économique d'aujourd'hui, `bien faire du premier coup` est impératif pour maintenir la compétitivité des entreprises. La recherche de l'efficience est alimentée par diverses opportunités provenant de technologies émergentes telles que l'assemblage par métrologie 3D, la fabrication additive (FA) et la fabrication hybride (FH) lesquelles proposent une multitude de possibilités ayant un potentiel significatif.

Étude de l’erreur humaine dans le processus d’assemblage de moteurs d’avions

Tout au long de l’histoire de l’humanité le progrès scientifique et technique a été un moteur de notre évolution comme espèce. Ce progrès pousse l’humain constamment à reconsidérer ses propres limites tant du point de vue physique que cognitif. Bien que les conséquences des actions erronées des humains soient connues depuis l’antiquité, industrie 4.0 mène à un changement de paradigme de production. Il s’ouvre à nous, entre autres, de nouvelles possibilités pour réduire l’occurrence des dites erreurs via diverses technologies numériques.

Desensitization of axial compressor performance and stall margin to tip clearance gap increase

The degradation in performance and operating envelope of aero-engines with age and during critical transient operating conditions such as take-off is a well-known phenomenon. It is mainly caused by the increase in size of the tiny gap between the tip of the compressor rotor blades and the shroud, called tip clearance, from wear and/or shroud thermal expansion, which results in a drop of compressor pressure rise, efficiency and safety margin against aerodynamic instabilities.

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