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

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。

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.