改进的预测气体燃料贫油熄火边界的半经验公式

An Improved Semi-Empirical Correlation for Prediction of Lean Blowout Limits for Gas Turbine Combustors Using Gas Fuel

关键词:  燃气轮机燃烧室  气体燃料  贫油熄火边界预测  气体燃料FV模型

Key words:  Gas turbine combustor  Gas fuels  Prediction of lean blowout limits  FV-model for gas fuels

摘要:

为了进一步考察采用气体燃料时，火焰体积(FV)模型对贫油熄火边界预测的适用性，推导了气体燃料的FV模型。经过对7种典型的航空发动机燃烧室(即采用双径向旋流器和双轴向旋流器，分别改变一级旋流器、二级旋流器的进气面积和主燃孔的个数)进行验证实验，并与液体燃料FV模型和Lefebvre模型的预测结果进行比较。结果表明，上述三种模型虽然基本都可以用于气体燃料贫油熄火边界的预测，但各自的预测精度不同。在实验范围内，气体燃料FV模型、液体燃料FV模型、Lefebvre模型的预测精度依次为[±]5.6%，[±]6.9%，[±]7.1%。气体燃料FV模型在预测气体燃料的贫油熄火边界时有最好的预测精度。

Abstract:

In order to further investigate the applicability of Flame Volume (FV) model for predicting lean blowout limits of gas fuels，FV-model for gas fuels is deduced. To validate this model，experiments are conducted on 7 typical aircraft engine combustors (adopting dual-radial swirl-stabilized assembly and dual-axial swirl-stabilized assembly，changing flow area of primary swirler and secondary swirler and number of primary holes，respectively). The results predicted by gas fuel FV-model are compared with the results by liquid fuel FV-model and Lefebvre model. It verified that aforementioned 3 models can predict lean blowout for gas fuels，while respective predictive accuracies are slightly different. Within the limit of these experiments，the predictive accuracies of gas fuel FV-model，liquid fuel FV-model，Lefebvre model are [±]5.6%，[±]6.9%，[±]7.1%，respectively. In conclusion，gas fuel FV-model has best accuracy to predict lean blowout limits for gas fuel.