Influences of the Geometry of the Scavenge Pipe on the Air–Oil Two-Phase Flow and Heat Transfer in an Aero-Engine Bearing Chamber

Lu, Peng; Fang, Lulu; Wang, Xiangyang; Ye, Qihang; Zhang, Jingzhou

doi:10.1021/acsomega.9b02095

Cited by 2 publications

(1 citation statement)

References 19 publications

(24 reference statements)

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“…Pipe system designers often need to know the exact positions and volumes of the joints as they need match the installed joints as closely as possible with specifications and to rate the pipes connected to the joints appropriately [ 4 ]. In the field of fluid mechanics, the characteristics of fluid flow (e.g., fluid velocities and pressures) through the elbow joints are of interest for many individuals [ 5 , 6 , 7 , 8 ]. Therefore, the geometry of the elbow joints via accurate three-dimensional (3D) modelling is essential for many related designs and studies.…”

Section: Introductionmentioning

confidence: 99%

Geometric Modelling for 3D Point Clouds of Elbow Joints in Piping Systems

Chan

Xia

Lichti

et al. 2020

Sensors

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Pipe elbow joints exist in almost every piping system supporting many important applications such as clean water supply. However, spatial information of the elbow joints is rarely extracted and analyzed from observations such as point cloud data obtained from laser scanning due to lack of a complete geometric model that can be applied to different types of joints. In this paper, we proposed a novel geometric model and several model adaptions for typical elbow joints including the 90° and 45° types, which facilitates the use of 3D point clouds of the elbow joints collected from laser scanning. The model comprises translational, rotational, and dimensional parameters, which can be used not only for monitoring the joints’ geometry but also other applications such as point cloud registrations. Both simulated and real datasets were used to verify the model, and two applications derived from the proposed model (point cloud registration and mounting bracket detection) were shown. The results of the geometric fitting of the simulated datasets suggest that the model can accurately recover the geometry of the joint with very low translational (0.3 mm) and rotational (0.064°) errors when ±0.02 m random errors were introduced to coordinates of a simulated 90° joint (with diameter equal to 0.2 m). The fitting of the real datasets suggests that the accuracy of the diameter estimate reaches 97.2%. The joint-based registration accuracy reaches sub-decimeter and sub-degree levels for the translational and rotational parameters, respectively.

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Section: Introductionmentioning

confidence: 99%

Geometric Modelling for 3D Point Clouds of Elbow Joints in Piping Systems

Chan

Xia

Lichti

et al. 2020

Sensors

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Simulation of Unsteady Flows of Oil/Gas in the Ventless Bearing Chamber of an Aero-Engine

Wang

2022

Aerospace

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The unsteady motion behavior of oil/gas two-phase flow in a novel ventless bearing chamber has significant impacts on the lubrication and heat transfer efficiency of bearings due to the various advantages of lower pressure levels and weaker rotating airflow effects. In this paper, the unsteady motion behavior of oil/gas two-phase flow in a ventless aero-engine bearing chamber is investigated by three-dimensional numerical simulation through the volume of fluid (VOF) method, and the numerical method is verified using published experimental data. The flow characteristics of oil/gas two-phase in the secondary flow and three-dimensional flow are investigated. The results show the evolution of vortices and the transition of the driving mode in the unsteady motion of oil/gas two-phase flow, and a criterion for the shift of the driving mode at different rotor speeds is proposed. As the rotation speed increases, the variation trend of the velocity field and pressure field of oil/gas two-phase flow is consistent, and the accumulation region of oil becomes inconspicuous. The results indicate a reference for enhancing the performance of lubrication systems for aero-engines.

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Influences of the Geometry of the Scavenge Pipe on the Air–Oil Two-Phase Flow and Heat Transfer in an Aero-Engine Bearing Chamber

Cited by 2 publications

References 19 publications

Geometric Modelling for 3D Point Clouds of Elbow Joints in Piping Systems

Geometric Modelling for 3D Point Clouds of Elbow Joints in Piping Systems

Simulation of Unsteady Flows of Oil/Gas in the Ventless Bearing Chamber of an Aero-Engine

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