Abstract
Article describes numerical simulations of air flow in radial compressor stage in NUMECA CFD software. In simulations geometry variants with and without seals are used. During tasks evaluating was observed seals influence on flow field and performance parameters of compressor stage. Also is described CFDresults comparison with results from design software based on experimental measurements and monitoring of influence of seals construction on compressor stage efficiency.
Highlights
This article is about CFD simulation of radial turbocompressor stage in NUMECA FINE/Turbo software including flowing in labyrinth seals area
The goal was find out influence of centrifugal impeller seals presence in geometry on stage efficiency and pressure ratio
Our simulation shows that total axial force acts in the direction of the compressor intake and according to expectation the force is growing with decreasing mass flow
Summary
This article is about CFD simulation of radial turbocompressor stage in NUMECA FINE/Turbo software including flowing in labyrinth seals area. The goal was find out influence of centrifugal impeller seals presence in geometry on stage efficiency and pressure ratio. Solved stage is designed for placement into multistage compressor with impellers located between bearings. It is stage with three-dimensional shaped impeller blades (3D impeller), which are generally used in higher mass flow coefficients area. The simulated stage is designed for middle mass flow coefficients, which creates boundary between using of 2D and 3D impellers. With descending mass flow value through the stage, seals loss to total stage efficiency ratio is increasing. Stage is composed from axial guidance device with regulatory blades, centrifugal impeller, vaneless diffuser and return channel. Axial guidance device with turning blades is used for regulation in the radial turbocompressor intake
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