A study on the optimum characteristic parameters for the diffuser located perpendicularly in a baffle plate

The exit edges of a diffuser are smoothly rounded, and a baffle plate is located perpendicularly to a diffuser exit. The fluid is discharged towards the radial direction of a diffuser after impinging against a baffle plate from a diffuser. In this flow path, pressure loss coefficients have been calculated by the variables of Reynolds number at a diffuser inlet, distance between a diffuser exit and a baffle plate, and turbulence models. It was found that in case of the flow with relatively high Reynolds number at a diffuser inlet, the pressure loss coefficients by RNG k- ε model have a tendency to be near to those by standard k- ε model at small ratio of h/ D0, but to those by RSM at large ratio. As a result, it was calculated that hi Do ratio between 0.35 ∼ 0.4 has the minimum pressure loss coefficient regardless of Reynolds number and turbulence models