WIDE-ANGLE FLAT, CONICAL AND AXISYMMETRIC RING DIFFUSERS Russian patent published in 2021 - IPC F02C7/00 F04D29/44 F04D29/54 F01D25/30 

FIELD: mechanical engineering.

SUBSTANCE: wide-angle flat, conical and annular axisymmetric diffusers with opening angles α_i 10° and degrees of expansion above n_i=2 are offered, characterized in that the inner streamlined surfaces of their outer contours are made by narrow and relatively deep rectangular grooves with a width of no more than 2 mm at a depth of no more than 7 mm, evenly spaced over the entire streamlined surface with a wall thickness between the grooves (partitions) ~ 0.5 mm, moreover, in conical and annular diffusers, when the wall thicknesses between the grooves s=2 mm along the longitudinal axis are reached, the number of longitudinal grooves increases on the subsequent streamlined surfaces of the diffusers.

EFFECT: occurrence of separation of the flow from the streamlined surface is significantly reduced, which contributes to overcoming large positive longitudinal pressure gradients.

1 cl, 4 dwg