This book is an expanded and refined version of a master's research project, now presented as a comprehensive study integrating both experimental and numerical methods. The book explores how swirl influences flow behavior, pressure recovery, and efficiency in conical diffusers-key components in aerospace and fluid machinery.The authors designed a transparent Perspex diffuser and introduced swirl using a custom vane-type swirler. Using hot-wire anemometry and Pitot probes, they measured velocity profiles, pressure distribution, and turbulence characteristics. To validate and extend the...