An experimental study of diverging angle effect on separation location in two - dimensional diffuser

Abstract

The present study deals with flow of air in a two dimensional diffuser. A numberof test models of diffusers with different angles raging between (0◦ - 30◦) weremanufactured. The air was implemented as working fluid in the test with differentReynolds number (6.85 × 104 – 1.64 × 105 ) at the duct inlet.The study includes a number of experiments for air velocity and static pressuremeasurement. The results showed the following:1- Separation Phenomenon is obtained at divergent angles ( θ > 8◦) .2- The location of separation delays by decreasing the divergent angle and byincreasing of Reynolds number.3- The static pressure recovery coefficient decreases with the increasing diffuser arearatio (AR).