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Consider a piston engine equipped with a turbocharger.

In the turbine section of the turbocharger, the pressurized exhaust airflow comes from the center (radially) to the blades, then changes direction 90 degrees, leaving the blades in axial direction in turbine. (I think airflow maybe half or last 2/3 of blade travel in axial direction?)

What does the pressure distribution at the radial turbine blade look like? Does the airflow transfer force to the blades using the same principles as on airfoil/wing, where the airflow accelerated over the upper surface of the wing creates low pressure and decelerate at high pressure side ?

enter image description here

enter image description here

I know in axial turbine(picture below),every blade is like "small wing", operate identical as wing in aerodynamic sense, obviously without tip vortex because of blockage of housing

enter image description here

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  • $\begingroup$ please add the sources of the images you've used $\endgroup$
    – ymb1
    Nov 12 '21 at 11:51
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    $\begingroup$ The image looks like the pressurized exhaust comes from the circumference and flows into the centre on the turbine. The same is true of the early turboject engines that had centrifugal turbines. $\endgroup$
    – Jan Hudec
    Nov 12 '21 at 11:57
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    $\begingroup$ @JanHudec: Yes. Better drawing. The turbine works like in a Francis design for water (radial then axial). $\endgroup$
    – mins
    Nov 12 '21 at 16:13

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