I am working on calculating the exhaust temperature in the upstream and downstream section of an IC engine catalytic converter. Please share any methodology or research article to corroborate your response.
Highly grateful.
Do you mean between the exhaust valves, the exhaust manifold, and where the CC is bolted on? And between the outlet flange of the CC, the front pipe, muffler, and tailpipe? Why not just put a thermocouple on either side of the CC and measure the temperatures? I'm sure this is different for every car design and also operating conditions. The heat loss will also vary from case-to-case.
To add to Dudley's excellent response, the motion of the car (depending on the design of the exhaust layout) will also influence the heat transfer - is the car idling at rest? Or has the person floored the pedal from the get go, and there's a 100kph air flow convecting heat from the skin of the CC?
checking temp.drop at 2 ltr petrol engine at 1500 rpm.:
temp inlet compared to temp outlet of catalytic converter is delta 30-50 dgr celsius
so the drop is some 30-50 degr.. without any doubt due to the catalitic proces of
inlet CO and O2 , producing CO2 by using an accelerator.
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