Thermodynamic investigation was conducted to study the role of ejector system in a CGR (Combustion Gases Recirculation) combustor. Physical model was established to evaluate the intensity of CGR and the confirmed relationship between CGR and gas ejection was found. In order to validate the theory analyses, an industry combustor with CGR was modeled. The calculation results accord with the theory analyses. All the results implied that Active Control Combustion (ACC) might be implemented with control of gas ejection.

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