I am trying to learn some more about turbo sizing. I have a pretty good grip on how to size turbos read and plot out on compressor maps but I want to understand more about what's going on on the turbine side and how to size the small turbo in a compound setup.
Maybe I'm thinking about this wrong but since learning about how to read maps I have always thought about compressors as flowing mass and on a map a compressor has a mass flow limit. When put into a compound turbo setup what is happening when the small turbo is forced to flow more than it's rated flow?
Turbines I am trying to learn more about. On Garretts site I went and looked at the biggest turbo and just did a quick comparison between the flow rates on the turbine maps and the compressor maps. The highest turbine flow curve tops out at around 70 lb/min where the right side of the compressor map is around the 160 Lb/min mark. Obviously the turbine has to flow all the air that the compressor is pushing plus the mass of the burned fuel. Is the additional mass just flowed through without producing work beyond 70 Lb/min?
Maybe I'm thinking about this wrong but since learning about how to read maps I have always thought about compressors as flowing mass and on a map a compressor has a mass flow limit. When put into a compound turbo setup what is happening when the small turbo is forced to flow more than it's rated flow?
Turbines I am trying to learn more about. On Garretts site I went and looked at the biggest turbo and just did a quick comparison between the flow rates on the turbine maps and the compressor maps. The highest turbine flow curve tops out at around 70 lb/min where the right side of the compressor map is around the 160 Lb/min mark. Obviously the turbine has to flow all the air that the compressor is pushing plus the mass of the burned fuel. Is the additional mass just flowed through without producing work beyond 70 Lb/min?