Abstract
In this paper, in view of the leakage of bearing lubricating oil and gas during start-up and acceleration of high pressure ratio centrifugal compressor system, a lumped parameter model including impeller, vaneless diffuser & volute, hub side seal and pipe is established, and 3-D CFD model is used to obtain the aerodynamics performance of the main compressor components and the hub side seal. The critical boundary line of the flow pressure rise curve of the compressor is calculated, and the maximum threshold value of the valve opening at each speed is obtained; in the meantime, the difference of compressor performance and backflow boundary between transient process and steady state is predicted. The research provides a theoretical reference for explaining the leakage of bearing lubricating oil and gas during the start-up and acceleration of high-speed centrifugal compressor, and puts forward a control scheme for the flow rate of compressor in such process.
| Original language | English |
|---|---|
| Pages (from-to) | 1903-1910 |
| Number of pages | 8 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 41 |
| Issue number | 8 |
| State | Published - 1 Aug 2020 |
Keywords
- Backflow of gas
- Centrifugal compressor
- Hub-side leakage
- Lumped parameter model