What is the benefit of the spiraled shape? More efficient? If so how come…also why not have an impeller inside a straight tube?
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Clarification: do you mean the duct that goes round and narrows down? That’s a duct to efficiently feed the turbine. The turbo is actually a very tiny “wheel” in the center of it. 1-2 inch diameter. Both the turbine and the the compressor are centrifugal type, and have similar ducts, the duct feeds air all around the circumference of the rotating bit of the turbine. For the compressor, the duct collects compressed air all around the rotating bit.
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