Mohammadmehdi Namazi - Department of Mechanical Engineering, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran.
Arash Behzadi - Department of Mechanical Engineering, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran.
Amin Jabbari - Department of Mechanical Engineering, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran.

The performance of a conical diffuser with annular secondary injection at the inlet is evaluated.Numerical calculations showed an improvement even at moderate injection rates. The effects of injectionvelocity and diffuser geometry on pressure recovery and stall were investigated. The simulation results agreedwell with the experimental data

Diffuser; Secondary flow; flow separation