Abstract
In order to control the low frequency combustion instabilities in dump combustor efficiently, control technology of low-frequency combustion instabilities is investigated with numerical simulation and experiment. Combustion instabilities active control experimental system and control equipment are designed. Open loop active control for pulsed liquid fuel injection is experimentally studied. Results show that periodic heat release due to fuel pulse injection is responsible for suppressing pressure oscillations. While the periodic heat release is in reverse phase with pressure oscillation, amplitude is reduced obviously. It can be concluded that injection phase angle is the leading factor of control effect. Air injection control methods are simulated by large eddy simulation (LES). Results indicate that formation of large scale vortices from dump plane is effectively interrupted. Passive control technology is numerically studied with improved dump configuration of combustor by steps dump plane. It is determined that disturbance of large scale vortices formation and interruption of positive feedback mechanism are the primary approaches of low-frequency combustion instabilities passive control.
| Original language | English |
|---|---|
| Pages (from-to) | 59-64 |
| Number of pages | 6 |
| Journal | Tuijin Jishu/Journal of Propulsion Technology |
| Volume | 32 |
| Issue number | 1 |
| State | Published - Feb 2011 |
Keywords
- Combustion control
- Dump combustor
- Experiment
- Large eddy simulation
- Low frequency combustion instabilities