Outer edge bending is already used on the axial fan blades of air conditioners, reducing leakage flow loss at blade tip and suppressing vortex development, thereby improving aerodynamic acoustic performance. However, there are few studies multi-parameter design optimization this complicated structure, most only focus overall sound pressure level rather than quality when evaluating noise. This s...

A novel design of range hood, which was termed the inclined quad-vortex (IQV) range hood, was examined for its flow and containment leakage characteristics under the influence of a plate sweeping across the hood face. A flow visualization technique was used to unveil the flow behavior. Three characteristic flow modes were observed: convex, straight, and concave modes. A tracer gas detection met...

Flow instability is a common issue encountered by high-speed compressors when they operate outside of their optimal range, especially in highly loaded compressors. This study investigates the potential an unsteady passive flow control technique, self-excited bleed (SEB), which involves casing modification, to improve base and stability characteristics ultra-highly low reaction transonic compres...

relative work ratio (t AD /t DD) relative work ratio (t AD /t DD) (As described in Subsection 5.3, each number in the shaded portion of the table is a ratio of the AD–generated derivative value D AD to the DD–generated derivative value D DD. In experiment 1, the blank entries indicate derivatives that were computed to be zero by both D AD and D DD. In experiment 2, each " * " indicates a ratio ...

Tip vortex cavitation is one of well known patterns of cavitation phenomenon which occurs in axial pumps. This pattern of cavitation occurs due to pressure difference between the pressure and suction sides of blades of an axial pump. Since the pressure in the pressure side of the blade is higher than the pressure in its suction side, thus a very small portion of liquid flow flows back from pres...

Experimental and numerical studies of a linear high-loaded turbine cascade with dual−cavity tip structure are presented in this paper. The experimental conditions contained an increase the outlet Mach number from 0.42 to 0.92, change incidence angle −15° 15° relative clearance size 0.36% 1.4%. ability control leakage losses vortices is assessed using total pressure coefficient Q-criterion. This...

Considering the numerous applications of the study of the flow due to leakage in a buried pipe in unsaturated porous media, finding a proper model to explain the influence of the effective factors is of great importance.There are various important factors involved in this type of flow such as: pipe leakage size and location, burial depth, the degree of the saturation of the surrounding porous m...

Unsteady forces generated by fluid flow through the impeller shroud leakage path of a centrifugal pump were investigated. The effect of leakage path inlet swirl (pump discharge swirl) on the rotordynamic forces was re-examined. It was observed that increasing the inlet swirl is destabilizing both for normal and tangential rotordynamic forces. Attempts to reduce the swirl within the leakage path...

Casing treatment is a powerful method for improving the stability of aircraft compressors. An optimized slot-type casing was tested on first rotor highly-loaded two-stage compressor, and results showed that could not increase compressor at design off-design speeds. A coupled (CCT), which built with an injector, bridge, plenum chamber, several slots recirculating loop, proposed to enhance in pre...