Turbine Jet Motor Uses Lubricating Oil: Good High Temperature Performance


Posted July 24, 2019 by Aggisxjetl

What are the specific requirements for the aviation lubricants used? Eaton Char-lynn Motor Description:
 
The turbojet motor, commonly known as the "turbojet" motor, is one of the typical powers of the second-generation aircraft (the MiG-21 and the 歼-7 generation). The working principle of the turbojet motor is to use the high-temperature gas generated by the combustion to expand, and generate a thrust at a high speed from the reaction force generated by the spray of the viewer. In order to allow enough air to enter the motor, the air must be compressed, so there will be a compressor, and the compressor must also have a high pressure turbine.



The requirements of the turbojet motor itself:



To support the compressor and the turbine, at least three bearings are required: the compressor front bearing is located at the front end of the intake port; the compressor rear bearing is located behind the compressor and before the combustion chamber; the turbine bearing is located in front of the gas turbine and the combustion chamber. Rear. These three bearings are the main lubrication points for turbojet motors. What are the specific requirements for the aviation lubricants used? Eaton Char-lynn Motor Description:



Relatively speaking, the friction coefficient of the part using the rolling bearing is small, the generated heat is not large, and a small amount of lubricating oil can satisfy the demand. However, due to the large bearing of the turbojet motor bearing, the elastic deformation of the roller is large, and the sliding friction occurs at the same time, which generates a large amount of heat; plus the rotational speed is as high as 12000~25000r/min. More heat. In addition, the heat transferred by the combustion chamber and the heat caused by the leakage of the sealed air are superimposed on each other, which makes the bearing temperature increase greatly. This requires that the lubricating oil for the turbojet motor must use the oil with good high temperature performance.



Compared with the turbofan motor, the thrust of the turbojet motor is small, the gas temperature before the turbine is about 750~1000°C, and the temperature of the bearing is about 150°C. Therefore, the lubricating oil can withstand 80~120°C. The high temperature is enough. At a temperature of 50 ° C, the kinematic viscosity reaches 8 mm / s to meet the demand.



For many fighters, their turbojet motors have an afterburner. When the force is turned on, the motor continues to accelerate and the temperature of the combustion chamber rises linearly. At this time, the heat load of the Zhoucheng ministry increased, and it rose to about 170 °C. This requires the high temperature performance of the lubricating oil to reach 150 ° C, and the kinematic viscosity reaches 3 mm / s at 100 ° C temperature, generally only the diester oil can meet this condition.





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Tags turbine jet motor
Last Updated July 24, 2019