The radial, or centripetal, turbine is used for very small flows, where it is cheaper and simpler to make than an axial flow turbine. It is used in the smallest gas turbine engines, as in some automotive or fire pump or other portable applications, and is used extensively in the smaller turbochargers. It is also suitable for turbo-expansion applications (section 2.9). Its size ranges up to about 0.15 m diameter, and its rotational speed is likely to be between 60 000 and 100 000 rev/min.
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