To analyze the influence of tapered form two upper vertices a rectangular cube placed in channel and impact insertion hollow center obstacle, three-dimensional study was executed using K-ω SST turbulence model. Different models were presented to examine features flow with Reynolds number Re=4×104. The kinetic energy, 2D 3D time-averaged streamlines, trace-lines, streamwise velocity profiles, pr...

Self-aerated flows in flat chutes are encountered downstream of the bottom outlet, spillways with a small slope and storm waterways. In present study, development self-aeration chute flow is described new experiments performed long pressure outlet for different discharge rates. The distribution air concentration, time mean velocity fluctuation direction self-aerated developing region—where bubb...

Indoor air conditioning systems play a crucial role in regulating the environmental conditions of enclosed spaces. The noise generated by such can significantly impact human comfort. multiblade centrifugal fan, as component indoor conditioners, has significant on performance conditioner. vortex, which is primary source inside hinders aerodynamic reduction unit. During experimental research and ...

In the process of tea plucking and leaf gathering, structure optimization design collecting mechanism is key element responsible for fresh leaves. The unreasonable manufacture mechanisms will cause smooth collection leaves, quality collected leaves be damaged, commodity value reduced. order to further study structural characteristics mechanism, an air outlet model was established phenomena inte...

The gravitational water vortex turbine is an alternative to renewable energies, it transforms the hydrokinetic energy of rivers into electric and does not require a reservoir. According studies carried out, hydraulic efficiency can increase or decrease according geometrical configuration. This paper presents numerical (CFD) analytical comparison between conical cylindrical designs for outlet. r...

One possible method of reducing jet noise at takeoff is the use of an ejector in which the propelling nozzle discharges into a shroud and thereby induces a secondary flow. The present report describes an experiment on the aerodynamics of such systems. The primary nozzle was axisymmetric and convergent and the shrouds were cylindrical with faired convergent entries. The stagnation temperatures o...

This work presents a mathematical approach based on the point collocation technique to compute the transmission loss of perforated dissipative silencers with transversal temperature gradients and mean flow. Three-dimensional wave propagation is considered in silencer geometries with arbitrary, but axially uniform, cross section. To reduce the computational requirements of a full multidimensiona...