- Banned
- #61
Makes sense but with that logic it would seem twins would allow for less exhaust pressure vs. trying to force 8 cylinders of exhaust through one turbine housing and across one wheel.Increased amount of turbine blade area over which conditions are optimal for expanding hot exhaust gas and extracting mechanical energy during the process the gas is cooled.
The smaller the turbine blade, the faster the gas transitions thru this interface and wwwaaayy more difficult to extract as well as optimize thermodynamics at any one particular flow rate.
Automotive turbine sections may be 14-24% thermodynamically efficiency.
Newest massive power plant turbine sections are 200% more efficient.
https://www.google.com/search?q=tur...ency&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari
The “pressure ratio” is related to efficiency.
Same reason dual exhaust is generally preferred for power output vs. a larger single pipe. Take 4" single exhaust vs. dual 3" for example. The dual 3" has more area for flow than a single 4" (14.13 sq in to 12.56 sq in), secondly the dual 3" has much more surface area than the single 4" (18.84 inches to 12.56 inches).
I guess the best way would be to measure exhaust pressure on each.
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