Torque of reciprocating compressors
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Dear seniors, how do we calculate the torque of a reciprocating compressor? The SPS simulation results show that for a reciprocating compressor, the speed and flow rate are 0; however, when there is a pressure ratio, the compressor’s torque is not equal to 0. Could someone please explain this?
The presence of a pressure ratio indicates that the inlet pressure and outlet pressure are not equal, which means that the gas inside the cylinder exerts force on the piston. A force acts on the piston; the crankshaft needs to generate a counterforce to maintain the piston’s position, thereby ensuring the pressure difference. Assuming there are no motors or couplings, and assuming no friction between the piston and the cylinder, then the piston will move until the pressures at the inlet and outlet are not equal.
Are you looking for the starting torque? Don’t set the speed to 0; try setting it to 1?
Tangential force * crankshaft radius. The tangential force is calculated using the formula for converting the overall piston force given in the manual; during no-load startup, the gas force is zero, and only the reciprocating inertial force and static friction force are present