Experimental study of oil-air two-phase flow and heat transfer characteristics in vertical vent pipes of aviation engine
Exploring the flow characteristics and heat transfer mechanisms of oil-air two-phase flow in the vertical vent pipe of an aircraft engine under different parameters is crucial for optimizing lubrication system design and enhancing aircraft safety and reliability. In this study, experimental research...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-10-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25009475 |
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| Summary: | Exploring the flow characteristics and heat transfer mechanisms of oil-air two-phase flow in the vertical vent pipe of an aircraft engine under different parameters is crucial for optimizing lubrication system design and enhancing aircraft safety and reliability. In this study, experimental research was conducted using a two-phase oil-gas test rig to explore the differences in flow patterns of oil-gas two-phase flow within a ventilation duct under different oil and air supply rates. The variation laws of the Nusselt number (Nu) with oil supply rate, air supply rate, and pipe diameter were established. The results demonstrate that Nu is fundamentally positively correlated with the oil supply rate and the air supply rate. Nevertheless, with the continuous increase of both supply rates, the rate of increase in Nu diminishes progressively. The present research provides a basis for better understanding the flow behavior and heat transfer characteristics of oil-air two-phase flow in vent pipes. The derived heat transfer correlations demonstrate good predictive accuracy within specified operating conditions (4500 ≤ Reair ≤ 32000, 33600 ≤ Reair ≤ 74000), thus broadening the applicability scope of previous studies. This work offers important references for the estimation and control of pipe wall temperature in vent pipes. |
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| ISSN: | 2214-157X |