Zack's calculation verification: water injection

Thu May 7 01:43:15 GMT 1998

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I know we are already finished with this topic...I think, but I want to add something.  (2 cents)

Zack gave us a good thermodynamic view of the compression process which showed that the charge was approximately 800°F at the end of compression.  

Actually, if we assume a 95% scavenge effeciency (based on mass), the BDC (prior) to compression temperature will be around 190°F, instead of the 80°F he started with, due to mixing with combustion products.  This takes the TDC temperature to a mere 1000°F (assuming the same isentropic, adiabatic, ideal gas, constant heat capacity path he chose).

Since 1000°F (810K) is well above the critical temperature of water (643K), water will be a gas phase UNLESS PRESSURE IS RAISED TO 3200 PSIA.  This does not happen before or after ignition, so I would say he is correct. :) 

Thanks, Zack for clarifying this for us.

Wayne Strasser
Chemical Engineer
2-Stroke EFI Patent Pending
Christ is "the Way and the Truth and the Life.":  John 14:6  

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<DIV><FONT color=#000000 size=2>I know we are already finished with this 
topic...I think, but I want to add something.&nbsp; (2 cents)</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Zack gave us a good thermodynamic view of the 
compression process which showed that the charge was approximately 800&deg;F at 
the end of compression.&nbsp; </FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT size=2>Actually, if we assume a 95% scavenge effeciency (based on 
mass), the BDC (prior) to compression temperature will be around 190&deg;F, 
instead of the 80&deg;F he started with, due to mixing with combustion 
products.&nbsp; <STRONG>This takes the TDC temperature to a mere 1000&deg;F 
</STRONG>(assuming the same isentropic, adiabatic, ideal gas, constant heat 
capacity path he chose).</FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT size=2>Since 1000&deg;F (810K) is well above the critical temperature 
of water (643K), water will be a gas phase UNLESS PRESSURE IS RAISED TO 3200 
PSIA.&nbsp; This does not happen before or after ignition, so I would say he is 
correct. :) </FONT></DIV>
<DIV><FONT size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Thanks, Zack for clarifying this for 
us.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Wayne Strasser<BR>Chemical Engineer<BR>2-Stroke 
EFI Patent Pending<BR>Christ is &quot;the Way and the Truth and the 
Life.&quot;:&nbsp; John 14:6&nbsp; </FONT></DIV></BODY></HTML>

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