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Plots

This section shows some of the common plots used in the rolling piston compressor with valve simulation. The plots shown in this section correspond to 4 completed revolutions of the rolling piston compressor:

Mass Flux

The mass balance is monitored with the mass flux plots.

1. Select inlet_inlet and outlet_outlet under Boundaries in the Geometric Entities Panel.
2. Click Add XY-Plot icon in the Toolbar.
3. Click Click for Variable List icon in the Plot Panel, select Mass Flux under Flow list.
4. Click Plot Selected Variables icon.
5. Click Plot Property icon, the Plot Property dialog box opens. Enable Moving Average and enter 180. Click OK.
6. Specify 0.003 kg/s for Maximum and -0.003 kg/s for Minimum under Display Default Range. Click OK.
7. Click Combine Entity Data into a Single Curve to obtain the net mass flux.

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Note:The moving average is used in transient simulations to obtain the average values of a variable in a sampling interval, over the entire simulation time. To plot the moving average, click, Click for Variable List icon in Plot Property dialog box and enable Moving Average. The value for the Moving Average input is number of preceding time steps (sampling interval) for calculating the average.

Valve Angle Displacement

To plot the angular displacement of the valve:

1. Click Add XY-Plot icon in the Toolbar.
2. Select Rotation (1 DOF) in the Model Panel.
3. Click Click for Variable List icon in the Plot Panel, select Angle Displacement from Rotation (1 DOF) list.
4. Click Plot Selected Variables icon.

Note: Other parameters, such as the Angular Velocity, Angular Acceleration and Fluid Torque can also be plotted under Rotation (1 DOF).

Volumetric Flux at outlet

The volumetric flux at the outlet is plotted as follows:

1. Select outlet_outlet under Boundaries in the Geometric Entities Panel.
2. Click Add XY-Plot icon in the Toolbar.
3. Click Click for Variable List icon in the Plot Panel, select Volumetric Flux under Flow list.
4. Click Plot Selected Variables icon.
5. Click Plot Property icon, the Plot Property dialog box opens.
6. Select L/min for Unit under Display Units.
7. Specify 200 L/min for Maximum and -100 L/min for Minimum under Display Default Range. Click OK.

Temperature at outlet

The temperature at the outlet is plotted as follows:

1. Select outlet_outlet under Boundaries in the Geometric Entities Panel.
2. Click Add XY-Plot icon in the Toolbar.
3. Click Click for Variable List icon in the Plot Panel, select Temperature under Heat list.
4. Click Plot Selected Variables icon.
5. Click Plot Property icon, the Plot Property dialog box opens.
6. Specify 600 K for Maximum and 0 K for Minimum under Display Default Range. Click OK.

Power

Power is the instantaneous integrated power of a boundary rotating about the Rotational Axis Vector of the rolling piston compressor chamber. To plot the power:

1. Select rotor under Boundaries in the Geometric Entities Panel.
2. Click Add XY-Plot icon in the Toolbar.
3. Click Click for Variable List icon in the Plot Panel, select Revolution Average Power in the Rolling Piston list.
4. Click Plot Selected Variables icon.

 

Pressure at monitoring point

The pressure is plotted at the monitoring point as follows:

1. Select port_point under Points in the Geometric Entities Panel.
2. Click Add XY-Plot icon in the Toolbar.
3. Click Click for Variable List icon in the Plot Panel, select Pressure from the Flow list.
4. Click Plot Selected Variables icon.

 

Temperature at monitoring point

The temperature is plotted at the monitoring point as follows:

1. Select port_point under Points in the Geometric Entities Panel.
2. Click Add XY-Plot icon in the Toolbar.
3. Click Click for Variable List icon in the Plot Panel, select Temperature from the Heat list.
4. Click Plot Selected Variables icon.