Determination of Bearing Oil Film Thickness (BOFT) for Various Engine Oils in an Automotive Gasoline Engine Using Capacitance Measurements and Analytical Predictions

1998 ◽  
Author(s):  
Spyros I. Tseregounis ◽  
Michael B. Viola ◽  
Rohit S. Paranjpe
Keyword(s):  
Film Thickness ◽  
Gasoline Engine ◽  
Automotive Gasoline ◽  
Oil Film ◽  
Engine Oils ◽  
Capacitance Measurements

Influence of High Rotational Speeds on Heat Transfer and Oil Film Thickness in Aero-Engine Bearing Chambers

1994 ◽  
Vol 116 (2) ◽  
pp. 395-401 ◽  
Author(s):  
S. Wittig ◽  
A. Glahn ◽  
J. Himmelsbach
Keyword(s):  
Heat Transfer ◽  
Film Thickness ◽  
Thermal Loading ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Test Facility ◽  
High Rotational Speed ◽  
Oil Film ◽  
Aero Engine

Increasing the thermal loading of bearing chambers in modern aero-engines requires advanced techniques for the determination of heat transfer characteristics. In the present study, film thickness and heat transfer measurements have been carried out for the complex two-phase oil/air flow in bearing chambers. In order to ensure real engine conditions, a new test facility has been built up, designed for rotational speeds up to n = 16,000 rpm and maximum flow temperatures of Tmax = 473 K. Sealing air and lubrication oil flow can be varied nearly in the whole range of aero-engine applications. Special interest is directed toward the development of an ultrasonic oil film thickness measuring technique, which can be used without any reaction on the flow inside the chamber. The determination of local heat transfer at the bearing chamber housing is based on a well-known temperature gradient method using surface temperature measurements and a finite element code to determine temperature distributions within the bearing chamber housing. The influence of high rotational speed on the local heat transfer and the oil film thickness is discussed.

Determination of oil film thickness on water surface by laser spectral methods

2005 ◽  
Author(s):  
T.A. Dolenko ◽  
P.S. Petrov ◽  
M.L. Serdobolskaya ◽  
T.A. Deydan ◽  
V.V. Fadeev ◽  
...  
Keyword(s):  
Film Thickness ◽  
Spectral Methods ◽  
Water Surface ◽  
Oil Film

The Effect of Oil Evaporation From the Cylinder Wall on Oil Consumption of a Gasoline Engine

2009 ◽  
Author(s):  
Yasuo Harigaya ◽  
Kazuyoshi Yamasuga ◽  
Michiyoshi Suzuki ◽  
Naoki Iijima ◽  
Masaaki Takiguchi ◽  
...  
Keyword(s):  
Film Thickness ◽  
Gasoline Engine ◽  
Hydrodynamic Lubrication ◽  
Film Surface ◽  
Cylinder Wall ◽  
Oil Consumption ◽  
Oil Film ◽  
Evaporation Model ◽  
Low Load ◽  
The Relationship

A new oil evaporation model was developed, combining a thermo-hydrodynamic lubrication model with a conventional oil evaporation model considering the energy balance on the oil film surface. This model assumed that there was evaporation loss of the oil film on the cylinder wall. In addition, the effects of the oil film thickness and types of lubricant in the evaporated oil from the liner were examined. Moreover, the calculated evaporative oil was compared with the measured oil consumption of a gasoline engine. The relationship between the evaporated oil, the lubricant viscosity, and the oil film thickness were clarified using this model. The results showed that the calculated oil evaporation from the cylinder wall closely corresponded to the measured oil consumption under low load conditions.

A Study on the Distribution of Oil Film Thickness in the Circumferential Direction of Oil Ring in a Gasoline Engine

2019 ◽  
Author(s):  
Akemi Ito ◽  
Tadatsugu Hakkaku ◽  
Kazuya Mochiduki ◽  
Keita Tomotsune ◽  
Masatsugu Inui ◽  
...  
Keyword(s):  
Film Thickness ◽  
Piston Ring ◽  
Gasoline Engine ◽  
Axial Direction ◽  
Circumferential Direction ◽  
Sliding Surface ◽  
Oil Consumption ◽  
Measuring Point ◽  
Oil Film ◽  
Cylinder Bore

Abstract Oil traveling upward through the sliding surface of a piston ring causes oil consumption of an engine. Piston rings are designed considering conformability to deformed cylinder bore. However, cylinder deformation sometimes affects strongly oil consumption. It suggests that a piston ring cannot conform dynamically to the cylinder bore. In this study, distribution of oil film thickness of an oil ring was measured for investigating the dynamic conformability. An optical fiber has embedded in the sliding surface of the lower rail of the oil ring, and oil film thickness was measured by laser induced fluorescence method. The measuring point was rotated in the circumferential direction, so the distribution in both the circumferential and the axial direction could be measured. Thick oil films partially were found and it was found that the oil ring did not conformed to the deformed cylinder bore dynamically. Furthermore, such oil film showed thicker value than those expected theoretically. It was showed that dynamic conformability must be considered for piston ring design for reducing oil consumption.

Measurement of the Journal Locus in the Con-Rod Big-End Bearing of an Automobile Gasoline Engine

1973 ◽  
Vol 95 (2) ◽  
pp. 249-254 ◽  
Author(s):  
M. Hiruma ◽  
S. Furuhama
Keyword(s):  
Film Thickness ◽  
Gasoline Engine ◽  
The Other ◽  
Inertia Force ◽  
Bearing Surface ◽  
Automobile Engine ◽  
Combustion Pressure ◽  
Oil Film ◽  
New Device ◽  
Automobile Gasoline

To measure the absolute oil film thickness or the journal center locus in con-rod big-end bearings of a practical automobile engine, a special new device and procedure have been developed. By means of this method, the measurement could be carried out stably up to full load at 5000 rpm. These measurements revealed that the journal travels along the vicinity of bearing surface by the inertia force. In the combustion period, however, the journal center passes near the center point of the bearing. On the other hand, under a misalignment condition, the minimum oil film thickness depends on the combustion pressure. Therefore in the future many of the problems related to con-rod big-end bearings will be resolved by this method.

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