# It is different from the working mechanism of the combustion of fuel in the cylinder of the internal combustion engine to push the piston to do work.

The swash plate engine belongs to the external combustion engine. Because of the different working mechanism of the fuel combustion in the internal combustion engine to push the piston to do work, the thermodynamic modeling in the cylinder is of little reference to each other. However, both types of engines use the working fluid to push the piston to move to achieve work, which makes the convective heat transfer models of gas and cylinder walls of mutual reference value. In addition to the establishment of the working temperature model of the underwater vehicle power system, the convective heat transfer model involves The temperature of the special point can be solved. Therefore, the heat dissipation model of the working fluid in the cylinder of the swash plate engine can be improved. The original one-point average temperature heat dissipation model of the working fluid in the swash plate engine will be improved, and the thermal process of the swash plate engine in the swash plate engine with different heat dissipation models will be compared and analyzed in combination with the thermodynamic mathematical model of the working fluid in the cylinder.

In-cylinder working fluid thermodynamic 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 after being distributed by the valve to push the piston to do work. Therefore, the thermodynamic modeling of the working fluid in the cylinder needs to be based on the valve train modeling and the engine kinematics analysis: the valve train modeling obtains the law of the change of inlet and exhaust area with the angle of the port hole, which is solved by the mass flow rate of the working fluid. Basic; engine kinematics analysis to solve the piston movement speed and displacement, to lay the foundation for solving the working fluid volume growth rate and external heat loss rate. In-cylinder working fluid heat dissipation model The external heat dissipation loss rate of the working fluid in the cylinder is proportional to the heat transfer coefficient, the contact area A, and the temperature difference between the working fluid and the wall surface. The contact surfaces include the inner wall surface of the cylinder liner, the bottom surface of the cylinder head and the top surface of the piston. Then the temperature difference between the working fluid and the contact surface can have the following three different calculation models. Heat dissipation model: One point average temperature model.

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