Their task is to convert kinetic energy to pressure energy. Basically, they are ducts with cross sectional area increasing in flow direction.
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Fig.D-34
Schematic representation of a planar rectangular diffuser (shown without cover plate). The in- crease in cross-sectional area in the flow direction - from inlet X to outlet Y - is due to the diverging mutual position of two opposing walls. |
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Fig.D-35 Axisymmetric diffusers: Simple straight-walled conical diffusers are usually the best choice; experience with "trumpet" and "bell" shapes has beendisappointing. |
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Fig.D-36
Flow regimes in planar diffusers. The optimum performance is usually achieved near to the appreciable stall line b - b. |
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Vaclav TESAR : "BASIC FLUID MECHANICS"