Axial And Radial Turbines By Hany Moustapha.pdf [extra Quality] Jun 2026

Use radial turbines for small power outputs (<500 kW) and high pressure ratios. Switch to axial turbines for large mass flows and multi-stage compounding.

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Before dissecting the content, it is crucial to understand the author's pedigree. Dr. Hany Moustapha is a globally recognized expert in turbomachinery, formerly the Director of the Technology Office for Advanced Small Engines at Pratt & Whitney Canada (P&WC). Use radial turbines for small power outputs (&lt;500

This paper synthesizes key principles from Hany Moustapha’s work on axial and radial turbines, focusing on aerodynamic design, loss mechanisms, and off-design performance. Axial turbines are preferred for high-flow, high-efficiency applications such as gas turbines, while radial turbines offer robustness and higher work output per stage for low-flow conditions. The paper compares velocity triangles, stage loading, reaction ratios, and loss correlations. Results indicate that axial turbines achieve efficiencies up to 92%, whereas radial turbines maintain 85–88% efficiency but with wider operating ranges. Design recommendations are provided for selecting turbine type based on specific speed and flow coefficient. Would you like to share specific pages or notes

A turbine is a device that extracts energy from a fluid and converts it into rotational energy. The two main types of turbines are axial and radial, classified based on the direction of fluid flow.