The pressure pulsation characteristics of the blade’s surface have an impact on lifespan multiphase pump impeller. To explore influence gap matching relation at pump, axial clearance coefficient (ACC) between impeller and diffuser relative tip were defined. By combining numerical simulation experiment, single pressurization unit studied under different relations. results show that size leakage ...

Aerodynamics in turbo-components and matched combustor characteristics relating to the design of ultramicro gas turbines (UMGT) were presented. Some detailed analysis were provided for the effects of heat transfer, tip clearance and geometrical restriction imposed to UMGT flow passages, as well as a leading concept of combustor design to achieve micro flame structure for enhanced efficiency and...

The tip-clearance flow in axial turbomachines is studied using large-eddy simulation with particular emphasis on understanding the unsteady characteristics of the tip-leakage vortical structures and the underlying mechanisms for cavitation-inducing low-pressure fluctuations. Systematic and detailed analysis of the velocity and pressure fields has been made in a linear cascade with a moving end-...

I N T R 0 D U C T I 0 N In recent years, the application of double-flow rotary vane compressor in automotive air-conditioning systems has been increased because of its multiple cylinder characteristic. A certain problem is its high friction loss at higher speeds. The greatest amount of the friction is caused by the lubrication systems between the vane tip and the cylinder wall and between vane ...

CFD was employed to simulate the steam flow in 1.5-stage cascades with three different seal clearances. When clearance is 0, there no leakage, obvious secondary cascade, and stage efficiency reaches 88.27%. of diaphragm rotor tip 1mm, leakage strongly interferes which promotes formation development end-wall near hub, has little effect on next stage, drops by about 2 percentage points. 4mm, hub ...