Abstract
To expose the effects of hub radial portion scale in a double-sided centrifugal compressor impeller on performance and inside flow structure, numerical simulation was carried out on a double-sided impeller with five different hub radial portion scales under un-equilibrium inlet condition. The simulation results show that, the hub radial portion is expected to exceed blade trailing edge, from both performance and flow stability standpoint. The best hub radial portion scale should be optimized based on impeller pressure ratio and efficiency performance compromise. The hub radial portion directly affects the double-sided impeller mass flow rate in both sides, hence the impeller performance. Due to the effect on the mass flow rate, different hub radial portion configuration can modify separation flow in downstream diffuser. The minimum hub radial portion impeller configuration tends to make the mass flow rate between front side and rear side unbalanced more easily than any other configurations.
| Original language | English |
|---|---|
| Pages (from-to) | 1330-1338 |
| Number of pages | 9 |
| Journal | Tuijin Jishu/Journal of Propulsion Technology |
| Volume | 34 |
| Issue number | 10 |
| Publication status | Published - Oct 2013 |
Keywords
- Double-sided impeller
- Flow characteristic
- Hub radial portion
- Numerical simulation
- Un-equilibrium inlet condition