This paper proposes and validates a jet formation criterion for synthetic jet actuators. The synthetic jet is a zero net mass flux device, adding additional momentum but no mass to its surroundings. Jet formation is defined as a mean outward velocity along the jet axis and corresponds to the clear formation of shed vortices. It is shown that the synthetic jet formation is governed by the Strouh...

Abstract The article presents qualitative data on the study of process diffusion combustion during outflow a gas jet from nozzle apparatus with certain arrangement nozzles. is round straight channel and coaxially located annular slot. In experiments, hydrogen or methane was supplied through an slot, air central circular micro nozzle. main features are revealed comparison processes carried out. ...

As an innovative ventilation mode, attached has been widely used in different types of buildings due to its high efficiency and energy saving. At present, the commonly air outlet form is slot outlet. Considering diversity application places, models (Slot (SO), Rectangular (RO), Circular (CO), Semi-circular (SCO)) were established this paper. Air distributions under forms are analyzed compared. ...

The present results are focused on the self-sustained oscillations of a confined impinging slot jet and their role in flow structure modeling requirements. Unsteady laminar, large-eddy simulation (LES), Reynolds-averaged Navier–Stokes (RANS) predictions an isothermal were validated for several nozzle-to-plate ratios (H/B=4–15) laminar (Re=340 480) turbulent (Re=104–2.7×104) conditions. was foun...

A three-dimensional turbulence model was used to determine the effects of animal-generated buoyant forces on the airflow patterns and temperature and airspeed distributions in a ceiling-slot, ventilated, swine grower facility. The model incorporated the Lam-Bremhorst turbulence model for low-Reynolds Number airflow typical of slot-ventilated, livestock facilities. The predicted results from the...

Abstract With the purpose of investigating effects geometry parameters CFJ (Coflow jet) device on aerodynamic characteristics supercritical bacj airfoil used by a STOL transport, we have carried out computational analysis with different values injection slot size and location under low-speed condition. The results show that lift coefficient decreases gradually decreasing stall angle, when is in...

An inclined air-curtain (IAC) fume hood was developed and characterized using the laser-assisted smoke flow visualization technique and tracer-gas (sulphur hexafluoride) concentration detection method. The IAC fume hood features four innovative design elements: (i) an elongated suction slot installed at the hood roof with an offset towards the rear wall, (ii) an elongated up-blowing planar jet ...

In this paper, A numerical study has been conducted to predict the hydrodynamic characteristics of the staggered ribbed backward facing step flow with inclined impinging jet. The impinging jet flow was inclined towards the main cross flow and the angle of inclination is ranged from  30 to  90 . The ribs were in staggered arrangement and aligned after the slot jet in normal direction to the ma...

This work investigates the hydrodynamics of jet wiping, a coating process in which thin slot gas impinges on film dragged by moving strip; thus, reducing thickness and developing run-back flow. The interaction between liquid is highly unsteady, producing long-wavelength defects final product known as undulations. We perform Computational Fluid Dynamics (CFD) simulations using High-Performance C...

In the heavy-frame advanced turbine systems, steam is used as a coolant for turbine blade cooling. The concept of injecting mist into the impinging jets of steam was experimentally proved as an effective way of significantly enhancing the cooling effectiveness in the laboratory under low pressure and temperature conditions. However, whether mist/steam cooling is applicable under actual gas turb...