Abstract
The fine control of fuel injection stability in gas turbine combustors is a key point in the development sustainable technologies for propulsion and power. It may improve the overall efficiency, facilitate smooth operation as well as reduce pollutant emissions. It is also the most feasible solution able to damp combustion instabilities if the latter occur. The concept of active control of combustion via the injection is meant to ensure combustion stability on the
whole operation envelope, extend the flammability limit in the lean domain, and produce a better atomisation at part load conditions. However, the practical aspects of this control remain technical challenges. The question is then to assess which control method on atomisation is effective, has a low-energy cost, and is technically feasible
and robust enough for an embedded application in a gas turbine. The aim of this ground research project financed by the Austrian Science Fund is therefore to evaluate active control strategies regarding airblast atomisation, based on a numerical approach. A particle transport numerical model was developed to assess the effect of different modulated parameters on the resulting spray [Giuliani et al. Effect of the initial droplet size distribution of the liquid
phase combined with transport phenomena on the resulting airblast spray in the far field. ICLASS 2009-133]. The injection geometry is an air-blast, the injected liquid is kerosene. The parameters that can be modulated in real time are the air mass flow rate, the liquid mass flow rate, the atomisation PDF and the injector tip position. Several fluctuations can be applied simultaneously, with or without phase-shift between each other. This paper reports
on the first assessments performed on an isothermal and non-evaporating test case. This approach offers a better understanding on the physics involved in the airblast injection when modulating one of its operation parameters
whole operation envelope, extend the flammability limit in the lean domain, and produce a better atomisation at part load conditions. However, the practical aspects of this control remain technical challenges. The question is then to assess which control method on atomisation is effective, has a low-energy cost, and is technically feasible
and robust enough for an embedded application in a gas turbine. The aim of this ground research project financed by the Austrian Science Fund is therefore to evaluate active control strategies regarding airblast atomisation, based on a numerical approach. A particle transport numerical model was developed to assess the effect of different modulated parameters on the resulting spray [Giuliani et al. Effect of the initial droplet size distribution of the liquid
phase combined with transport phenomena on the resulting airblast spray in the far field. ICLASS 2009-133]. The injection geometry is an air-blast, the injected liquid is kerosene. The parameters that can be modulated in real time are the air mass flow rate, the liquid mass flow rate, the atomisation PDF and the injector tip position. Several fluctuations can be applied simultaneously, with or without phase-shift between each other. This paper reports
on the first assessments performed on an isothermal and non-evaporating test case. This approach offers a better understanding on the physics involved in the airblast injection when modulating one of its operation parameters
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 23rd Annual Conference on Liquid Atomization and Spray Systems |
| Number of pages | 11 |
| Publication status | Published - 2010 |
| Event | 23rd Annual Conference on Liquid Atomization and Spray Systems: ILASS 2010 - Brno, Czech Republic Duration: 6 Sept 2010 → 8 Sept 2010 |
Conference
| Conference | 23rd Annual Conference on Liquid Atomization and Spray Systems |
|---|---|
| Abbreviated title | ILASS 2010 |
| Country/Territory | Czech Republic |
| City | Brno |
| Period | 6/09/10 → 8/09/10 |
Treatment code (Nähere Zuordnung)
- Review
- Theoretical