[David Goldstein (2008.09.01.1021 EDT)]
Bill,
People have to unblock it (by right clicking and left-clicking on unblock), after they rename it.
The fuel left always reads at 0%. Is it working right?
Could you explain the program a bit.
David
[From Bill Powers (2008.09.01.0900 MDT]
David Goldstein (2008.09.01.1021
EDT)
Bill,
People have to unblock it (by right clicking and left-clicking on
unblock), after they rename it.The fuel left always reads at 0%. Is it working right?
Could you explain the program a bit.
This is a simulation of the Otto (4-stroke) cycle. Google it. The program
uses the thermodynamic equations for an ideal gas to compute the
temperature and pressure from the volume during the compression and power
strokes, and to compute the pressure from the temperature when the
gasoline burns at the top of the compression stroke. The intake and
exhaust strokes are simplified: the temperature and pressure simply
return to ambient conditions. The gasoline burns over some period of time
which is why the pressure and temperature curves are rounded at the top.
This is done by burning a fraction of the remaining unburned injected
fuel on each iteration of the program. The “fuel left” label
shows how much unburned fuel is left at the end of the power stroke. When
the engine runs fastest, the most fuel is left unburned.
The brake just applies a counter-torque to the engine and slows it down.
Internal friction that increases with the square of the velocity also
slows the engine down, so it comes to a constant speed when the engine
torque equals the total resistive force with or without the brake
on.
This really isn’t PCT – sorry for the diversion.
Best,
Bill P.