Numerical investigation of thermal and hydraulic processes in the gte bearing chamber
| Autor: | Douaissia, Omar Hadj Aissa, Mykhailenko, T, Lysytsia, O, Petukhov, I |
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| Jazyk: | ukrajinština |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Herald of Aeroenginebuilding; № 2 (2018): Herald of aeroenginebuilding Вестник двигателестроения; № 2 (2018): Вестник двигателестроения Вісник двигунобудування; № 2 (2018): Вісник двигунобудування |
| ISSN: | 1727-0219 |
| Popis: | A rotor support is a key element of an aircraft engine’s lubrication system. Supports of gas turbine engine (GTE) serve to transfer forces from rotating rotors to engine’s case, they take significant static and dynamic loads from the engine’s shafts. Supports should provide sufficient rigidity of the power circuit of the engine and the necessary centering of the shafts in the entire range of realized loads. Details and engine nodes around each support creates a closed space – oil cavity (bearing chamber), in which the supply of oil to the bearing and it’s scavenge are realised. To prevent oil leakage from the support’s oil cavity through the seals, a higher pressure in the cavity around the bearing chamber by the pressurised air, most often taken from the GTE compressor, is created. As a result, when an engine is running, an air/oil mixture is present in the oil cavity of the support. This fact has great influences on the thermal and hydraulic processes that take place in the bearing chamber. Ensuring the proper thermal state of the oil and the rotor support of the gas turbine engine require a clear understanding and prediction of flows distribution and heat transfer in the bearing chamber when the engine’s operating conditions changes. Complex nature and poor knowledge of thermal and hydraulic processes that take place in the bearing chamber make the result to be obtained with a combination of experimental methods and Computational Fluid Dynamics (CFD).The paper presents the results of the numerical investigation of fluid flow and heat transfer in the simplified bearing chamber of aircraft engine using the methodology developed by the authors. It is shown that the nonuniformity of the flow distribution in the bearing chamber leads to a variable value of the boundary layer’s thermal resistance and, hence, the heat transfer coefficient, which has a significant effect on the heat transfer rate in the bearing chamber and, consequently, on the thermal state of the oil and parts of the rotor support. The developed methodology, based on conservation laws and methods of CFD simulation, makes it possible to provide the numerical investigation of thermal and hydraulic processes that take place in the bearing chambers of gas turbine engines. При работе двигателя в масляной полости опоры присутствует не однофазная среда – масло, а его смесь с воздухом, что в значительной степени влияет на протекание теплогидравлических процессов в камере подшипника. Обеспечение надлежащего теплового состояния масла и опоры ротора газотурбинного двигателя требует четкого понимания и прогнозирования теплогидравлических процессов, происходящих в камере подшипника при изменении режимов работы двигателя. В работе представлены результаты численного исследования потокораспределения и теплообмена в камере подшипника авиационного двигателя с использованием разработанной авторами методологии. Методология, базируясь на законах сохранения и методах CFD моделирования, позволяет численно исследовать протекание теплогидравлических процессов в камерах подшипников газотурбинных двигателей на этапе их проектирования. |
| Databáze: | OpenAIRE |
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