摘要(英) |
This thesis presents the numerical simulation of the rotary compressor including the accumulator and the compression chamber by using the software FLUENT. The analysis the periodic flow characteristics of the outlet in compression chamber is executed by simulation of dynamic meshes of rotor motion.
The k-? turbulent model is applied for the calculation of the accumulator. The results predict that the pressure varies at the different flow region (the connection between inflow tube and accumulator, the connection between the accumulator, and the outflow tube). The temperature at the outlet of the accumulator is predicted as uniformly distributed, and the velocity is higher at the outer than at the inside of the bend on the outflow tube. The refrigerant’s pressure in the compression zone increases with rotor motion before the outlet valve opened. At about 0.6 period, the pressure reaches the condition of valve-opening. The outlet valve opens and the pressure maintains a constant value until rotor sweep across the vane so that the compression zone and intake zone are connected, and the outlet valve closed. Compare two thermal boundary conditions of the compression chamber (constant wall temperature and insulated wall), the refrigerant’s temperature is 10% higher than that of the insulated wall. |
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