Fully developed incompressible turbulent flow with adverse and favorable pressure gradient in a conical diffuser and outlet pipe having a total divergence of 8°and an area ratio of 4:1 has been simulated by a DHR k—εturbulence model and it s wall function·BFC (Boundary -Fitted Coordinates) approach.

Fully developed incompressible turbulent flow in a conical diffuser having a total divergence of 8° and an area ratio of 4 has been simulated by a DLR k-ε turbulence model and its BFC(Boundary Fit Coordinates) method.

Fully developed incompressible turbulent flow in a conical diffuser having a total divergence of 8° and an area ratio of 4 has been simulated by a DHR κ-ε turbulence model and it s wall function BFC(Boundary Fit Coordinates)approach.

Fully developed incompressible turbulent flow in a conical diffuser having a total divergence of 80 and an area ratio of 4 has been simulated by DHR k-ε turbulence model and its Wall Function·BFC(Boundary Fit Coordinates)approach.

It will cause more back pressure for the design theory of active silencer when widening noise control frequency or enhancing noise reduction, The acoustic characteristics of a conic diffuse are analyzed in the method of mathematics and acoustic-electric Analogy A low frequency silencer with low flow-resistance is proved.

Robust Design Method of the Sealing Pipeline Joint Structure with Double-cone Pipe Union;