Turbocharger power
Turbocharger power
(OP)
Hello everybody:
I will appreciate if somebody can tell me of a site, books or documents where I can find information to calculate the power developed by the turbine of a turbocharger.
I have access to calculators that perform this task but, I am interested in to know, i.e. the relationship between the Enthalpy of the exhaust gases, the pressure ratio, the back pressure, and so on.
Thanks in advance.
I will appreciate if somebody can tell me of a site, books or documents where I can find information to calculate the power developed by the turbine of a turbocharger.
I have access to calculators that perform this task but, I am interested in to know, i.e. the relationship between the Enthalpy of the exhaust gases, the pressure ratio, the back pressure, and so on.
Thanks in advance.





RE: Turbocharger power
A less technical explaination is offered here
http://auto.howstuffworks.com/turbo.htm
RE: Turbocharger power
Next, you know you put in some number of pounds of air plus about 14 to air to fuel ratio, so you know how many pounds of exhaust you have. So at this point you know the puonds of exhaust and the pressure the expander is going to let the exhaust down to, so you will have to iterate what was the pressure of the exhaust entering the expander to gererate the same amount of work the air compressure used. You'll need to assume some properties of the exhaust, like its temperature and composition. You know its going to be about 65% N2, 25 % CO2 and 10% water. The expander will run about 65% efficient. (close enough eh?). So now you've matched the expander with the compressor. If you make lots of calculations you can draw a map of each side and match everything up. You can also calculate how cool the exhaust is coming out of the expander.
If you have access to process similators that handle all the ethalphies, entropies, heat and material balnces it will go much quicker.
RE: Turbocharger power