Numerical simulations have been performed to study the effect of circumferential single-grooved casing treatment (CT) at multiple locations on tip-flow stability and corresponding control mechanism three tip-clearance-size (TCS) schemes in a transonic axial flow compressor rotor. The results show that CT is more efficient when its groove located from 10% 40% tip chord, G2 (located near 20% chor...

Abstract Direct numerical simulations (DNS) are performed of a cantilevered stator blade to identify the unsteady and turbulent flow structure within compressor tip flows. The were with clearances 1.6% 3.2% chord. results show that both gap at exit on suction side highly phenomena controlled by fine-scale structures. signature classical tip-leakage vortex is consequence time-averaging does not ...

The tip-clearance size of compressor rotors has a big effect on both performance and off-design conditions. Increasing the value tip gap can lead to reduction in efficiency surge margin about 1 %. Mechanical constraints impose minimal clearance order for operate while further would generally be beneficial aerodynamically. However, sensitivity show more complex tendencies. For example, some stud...

In modern turbine rotors, tip-leakage flow is a common phenomenon that accounts for about 1/3 of the stage loss. Studies show as imposed load increases, shock wave appears in tip region, which causes significant interference on leakage vortex. present study, numerical simulations are carried out to investigate influence loss and breakdown The obtained results indicate with no effective control ...

Cavitation can cause noise in the water-jet pump. If cavitation occurs pump, hydraulic components pump are prone to erosion. The surface erosion reduces energy delivery efficiency and increases maintenance costs. decline performance will lead instability of entire system. In this paper, flow structure is studied by method numerical simulation experiment, which provides a reference for predictio...

A compressor tip clearance flow control scheme is explored using fluidic actuators, the so-called " synthetic jets " , on the casing wall acting over the clearance region. The analysis of flow visualization images show the largest increase in mixing level when forced at the optimal frequency. A reduction in the tip clearance-related blockage is demonstrated using an array of synthetic jet actua...