Abstract
The purpose of this paper is to predict the lean blow-out (LBO) fuel/air ratio based on the numerical simulation of the cold flow field of aero-engine combustors. The paper improves the combustion volume and combustion air contained in Lefebvre's LBO model, and then correlates the cold flow field to the LBO performance of the combustor through the combustion load parameter (V f·m r) obtained from the flammable limits. Commercial soft Fluent is used to solve the velocity and concentration field of the combustor. The method of Fuel Iterative Approximation (FIA) is proposed to predict the LBO performance of the combustor. Comparing with the experiment data, it is found that the LBO performance is related to the cold flow field of the combustor and V f·m r fits linearly with the LBO fuel/air ratio. The LBO prediction accuracy using Fuel Iterative Approximation is within ±8.4%.
| Original language | English |
|---|---|
| Pages (from-to) | 232-238 |
| Number of pages | 7 |
| Journal | Tuijin Jishu/Journal of Propulsion Technology |
| Volume | 33 |
| Issue number | 2 |
| State | Published - Apr 2012 |
Keywords
- Cold flow
- Combustion chamber
- Combustion load parameter
- Numerical simulation
- Prediction of LBO limits
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