Axial turbines are the workhorses of jet engines and large power plants. The PDF likely details:
Sites claiming to offer the PDF for free (e.g., pdfdrive, issuu pirated copies) often host malware, outdated scans, or incomplete drafts. More importantly, using outdated loss models from a scanned copy could lead to a 5% error in your design—which is catastrophic in gas turbine engineering. Axial And Radial Turbines By Hany Moustapha.pdf
The most direct source. Dr. Moustapha taught the "Turbine Design and Performance" course at VKI in Rhode-Saint-Genèse, Belgium. Axial turbines are the workhorses of jet engines