Abstract
Aiming at the inaccuracy of equivalent viscosity method in solving the film characteristics of piston-cylinder interface of high-pressure common rail radial piston pump, the film characteristics equation of piston-cylinder interface was established based on the theory of thermo-hydrodynamic lubrication. Through the solution, the thermal properties of the piston-cylinder interface film, which accounted for viscosity-temperature-pressure effect, were studied. The effects of cam speed and film inlet pressure on the characteristics of the piston-cylinder interface film were discussed. The conclusion has certain theoretical and engineering application value for the design and basic research of piston-cylinder interface.
Highlights
With the increasingly stringent emission regulations and the continuous progress of diesel engine electronic control technology, high-pressure common rail fuel injection system with its remarkable advantages has become the main trend of modern diesel engine technology development
The film viscosity is calculated according to the heat balance of the piston-cylinder or the average value of the pressure and temperature of the inlet and outlet film
The film of piston-cylinder interface is expanded along the circumference direction, as shown in Fig.2. x is the direction of the cylinder circumference, y is the axial direction of the cylinder, and z is the direction of the piston-cylinder interface film thickness. u, v and w are the speed components of lubricating film in x, y and z directions
Summary
With the increasingly stringent emission regulations and the continuous progress of diesel engine electronic control technology, high-pressure common rail fuel injection system with its remarkable advantages has become the main trend of modern diesel engine technology development. When the influence of temperature and pressure on film viscosity has been considering, the equivalent viscosity method is generally used to solve it. In this method, the film viscosity is calculated according to the heat balance of the piston-cylinder or the average value of the pressure and temperature of the inlet and outlet film. The film viscosity is calculated according to the heat balance of the piston-cylinder or the average value of the pressure and temperature of the inlet and outlet film This method can analyse the film characteristics of piston-cylinder interface, but the results are not accurate. In order to ensure the reliability and durability of the common rail system, it is necessary to study the film characteristics of piston-cylinder interface of the high-pressure common rail radial piston pump, including viscosity-temperature-pressure effect
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