Post2T - The post processing software
Post2T: Crank-Angle or Degree Based Output.
Selecting to display "Thermo- and Gasdynamic Traces" from the main menu opens the following dialog box:
The top left lists the 8 types of trace files that can be selected:
The following graphs are just a small example of the outputs that are available.
The following is a sample of pressure traces. It shows the transfer port, cylinder (limited to 4bar) and exhaust port pressures for an Aprilia RSW125 engine with port event lines:
This figure shows the mach traces for the exhaust port for an Aprilia RSW125 engine. The two traces show the mach values through the port opening (ExPMach), and about a 100mm (user defined position) from the piston (ExMach). It shows that the flow through the window is sonic for the initial blowdown period and also for the "stuffing" period.
The in cylinder temperatures are shown. The black line shows the mean temperature inside the cylinder (TCyl), the red line the temperature of the unburnt mixture (TUnBurnt), and the green line shows the burnt mixture temperature (TBurnt). It is also possible to display the temperature in any point of any plenum or duct.
This shows the left and right moving waves at the exhaust window, which explains why they are the same when the window is closed. Note how the blowdown pulse (PepRight) differs from the reflected pulse (PepLeft) during the window open period.
The purity of the cylinder is an indication of how good the scavenging was and what the purity of the plugging pulse was.
The traces shown here are the theoretical and calculated squish velocities.
The loads on the big-end bearings, main bearings and piston skirt can be simulated if the optional crankshaft data (and if required the balance shaft data) is entered.
This shows the mass flow in the transfer port window and the exhaust port window.
This shows the pressure ratios across the the compressor and the turbine and waste gate.
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