Direct Outer Ring Cooling of a High Speed Jet Engine Mainshaft Ball Bearing: Experimental Investigation Results

Gloeckner, Peter; Dullenkopf, Klaus; Flouros, Michael

doi:10.1115/1.4002355

Cited by 16 publications

(5 citation statements)

References 3 publications

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“…a ring temperature reduction of ΔT = 25 K is achieved by only 2 L/min oil flow through the outer ring cooling channel. In [27] further investigation results are presented. Amongst others in this paper it is shown that the cooling channel is efficient for a broad range of rotational speeds and axial load, and that the cooling concept is suitable for high oil inlet temperatures as well.…”

Section: Aerospace Bearing Designmentioning

confidence: 99%

The Evolution of Reliability and Efficiency of Aerospace Bearing Systems

Gloeckner¹,

Rodway²

2017

ENG

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The worldwide air traffic underwent a rapid development in recent decades. Between the early 70s and the late 90s of the last century civil air traffic doubled every 15 years. The civil aviation market will continue to grow with 4% -5% each year within the next 20 years. This enormous growth represents major challenges for airframers, engine makers, suppliers, airlines, air traffic management and ground infrastructure. In addition, the public debate on the worldwide civil air traffic is dominated by environmental and climate issues, even though only 2% of the man-made carbon dioxide (CO 2 ) emissions are due to air transportation. Therefore the aerospace industry will have to focus on a low-emission and quite air traffic, and on the conservation of natural resources and our environment. The end-use consumer and environmental policy requirements for aircrafts of the next generation translate into components with improved efficiency and reliability. Rolling bearings are one of these components which significantly determine the reliability and mechanical efficiency of aerospace applications such as aircraft and rotorcraft engines and transmission systems. They have to withstand very demanding operating conditions. Especially main shaft bearings in modern aircraft engines experience high rotational speeds and temperatures. Furthermore aerospace bearings have to meet the highest reliability standards and require low-weight design solutions. These operating conditions and requirements present a continuous challenge for improvements in all fields of bearing technology. This article presents solutions in aspects of materials, design, analysis, and surface technologies in order to meet the environmental, reliability, and economical requirements of advanced aerospace bearing systems. State of the art bearing analysis and advanced bearing design solutions contributing to lower friction power losses and increased systems efficiency are discussed. Weight, functional, and maintenance benefits are presented with the example of highly integrated aircraft engine main shaft bearings. It is also shown that the progress in bearing materials and surface technology devel-

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Section: Aerospace Bearing Designmentioning

confidence: 99%

The Evolution of Reliability and Efficiency of Aerospace Bearing Systems

Gloeckner¹,

Rodway²

2017

ENG

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“…The high-speed roller bearing is the core of the main shaft supporting the structure of high-speed rotating machines like aero-engine, and its stable and reliable operation is crucial to ensure the normal operation of the entire engine [1]. With the improvement of the thrust-to-weight ratio and economy performance of aero-engines, the main-shaft rotating speed is also increasing, leading to a higher bearing DN (rotating speed (rpm) × inner diameter (mm)) value and larger bearing heat generation [2]. The challenges of bearing lubrication and cooling are increasing in the bearing and oil system design.…”

Section: Introductionmentioning

confidence: 99%

Oil-Air Distribution Prediction Inside Ball Bearing with Under-Race Lubrication Based on Numerical Simulation

Lyu,

Li,

et al. 2024

Applied Sciences

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Oil/air two-phase flow distribution in the bearings is the basis for bearing lubrication status identification and precise thermal analysis of the bearing. In order to understand the fluid behavior inside the under-race lubrication ball bearing and obtain an accurate oil volume fraction prediction model. A numerical study of ball bearing with under-race lubrication is carried out to study oil-gas two-phase distribution inside the bearing, and the influence of several parameters is quantified, like bearing rotating speed, oil flow rate, oil viscosity, and oil density. The results indicate that the oil fraction in the bearing cavity between the inner and outer ring shows a periodic distribution along the circumference direction, and the period is the same as the number of under-race oil supply holes. Oil distribution alone radial direction is affected by the outer-ring-guiding cage and centrifugal force, leading to oil accumulation near the outer ring. Different bearing running conditions and oil characteristics do not change the oil distribution trend alone in circumference and radial direction, but the difference ratio. Finally, based on the numerical simulation results, a formula for the average oil volume fraction prediction in the bearing ring cavity is constructed.

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“…10,11 The temperature field in a bearing is closely related to the flow-field distribution, volume fraction of oil, and temperature of the bearing. 12 Owing to the high speed of the inner ring, the lubricating oil is easily discharged; therefore, the volume fraction of oil on the surface is small, and the heat dissipation is worse than that of the outer ring. Considering this phenomenon, the temperature of the inner ring is usually higher than that of the outer ring.…”

Section: Introductionmentioning

confidence: 99%

Heat-flow coupling variation in double-row tapered-roller bearings during the loss of lubrication process

Bai

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Loss of lubrication (LOL) is a severe problem in transmission systems, whereby the temperature increases continuously until failure. The temperature and flow-field distributions are complicated during this process. Limited research exists on the temperature and flow-field distributions and on heat generation of the transmission system during LOL. This study uses the computational fluid dynamics method to establish an oil–gas, two-phase flow model for the asymmetric bearings, and calculate the oil volume fraction on the bearing surface. In addition, a dynamic heat generation calculation method was proposed based on the kinematic viscosity change of the oil–air mixture during the LOL process. The temperature distribution of the large and small rollers and raceway surface during the LOL process was analyzed using a simulation method. The injection parameters were optimized to avoid gluing of the large roller. The internal temperature distribution has a strong positive correlation with the lubricant distribution during the LOL process. Moreover, the lubrication and temperature distributions on the large roller side are worse. A temperature reduction of approximately 25% is possible upon the increase of the number of oil inlets.

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Direct Outer Ring Cooling of a High Speed Jet Engine Mainshaft Ball Bearing: Experimental Investigation Results

Cited by 16 publications

References 3 publications

The Evolution of Reliability and Efficiency of Aerospace Bearing Systems

The Evolution of Reliability and Efficiency of Aerospace Bearing Systems

Oil-Air Distribution Prediction Inside Ball Bearing with Under-Race Lubrication Based on Numerical Simulation

Heat-flow coupling variation in double-row tapered-roller bearings during the loss of lubrication process

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