The working mechanism differs from the internal combustion engine fuel combustion to promote piston work

The swashplate engine belongs to the external combustion engine, and the working mechanism of the piston to perform work is different from that of the internal combustion engine combustion of the internal combustion engine, so that the thermodynamic modelling in the cylinder is not meaningful for reference. However, both types of engines are powered by the working fluid to promote piston work, resulting in convection heat transfer models between the gas and the cylinder wall have mutual reference value, coupled with the establishment of the underwater vehicle power system operating temperature model, the convection heat transfer model involved The special point temperature can be solved. Therefore, the cooling model of the working fluid in the swash plate engine cylinder can be improved. The original one-point average temperature heat dissipation model of the working fluid in the swash plate engine cylinder will be improved, and the thermal process in the cylinder of the swash plate engine with different heat dissipation models will be compared and simulated with the thermodynamic mathematical model of the working fluid in the cylinder.

In-cylinder thermodynamics Mathematical model In-cylinder working fluid Thermal state model The working principle of the swash plate engine is that the working fluid from the combustion chamber enters the cylinder regularly to promote the piston to work after being distributed by the gas distribution valve. Therefore, the thermodynamic modeling of the working fluid in the cylinder needs to be based on the valve mechanism modeling and engine kinematics analysis: the relationship between intake and exhaust area changes with the air hole hole angle is obtained by modeling the valve distribution mechanism, and the mass flow rate of the working fluid is solved. Basic; engine kinematic analysis solves the piston speed and displacement, and lays the foundation for solving the volume growth rate of the working medium and the external heat loss rate. The heat loss rate of the working fluid in the cylinder is directly proportional to the heat transfer coefficient, the contact area A and the temperature difference between the working fluid and the wall surface. The contact surface includes the inner wall surface of the cylinder sleeve, the bottom surface of the cylinder head, and the top surface of the piston. The temperature difference of the relative contact surface of the working fluid can have the following three different calculation models. Heat dissipation model: a point average temperature model.

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