Abstract:The lean blowout (LBO) limit plays a critical role in the operation of gas turbine combustors. In order to achieve the quick prediction of the LBO limit, three major prediction tools for the LBO limit, i.e. the semi-empirical correlation, the numerical prediction method and the hybrid prediction method are proposed. The semi-empirical correlations are mainly based on the characteristic time (CT) model and the perfect stirred reactor (PSR) model. The semi-empirical correlations based on the PSR model are widely… Show more
“…In addition, lean oil flameout is also an important problem to be solved in the design of aeroengine. 32 The low-temperature reaction path may also play an important role near the lean oil flameout limit.…”
In this study, a kerosene surrogate model fuel containing 73% ndodecane, 14.7% 1,3,5-trimethylcyclohexane, and 12.3% n-propylbenzene (percentage in mass) is developed by considering both the physical and chemical characteristics of practical aviation kerosene. By combining the small-size C 0 −C 4 (carbon number) core mechanism and the large hydrocarbon submechanisms, a low-and high-temperature chemical kinetic mechanism including 43 species and 136 reactions is constructed for the kerosene surrogate model fuel. The performance of the 43-species mechanism is validated by examining various experimental ignition delay times and laminar flame speeds of single component of n-dodecane and practical kerosene. The predicted main species concentrations during the oxidation process in the jet-stirred reactor by this small-size mechanism exhibit generally acceptable performance with the corresponding experimental data of RP-3 kerosene. The results of brute force sensitivity analysis indicate that the mechanism retains key reaction paths. This relatively small size can be applied to the simulation of computational fluid dynamics to further explore the practical problems of aviation fuel application in engine.
“…In addition, lean oil flameout is also an important problem to be solved in the design of aeroengine. 32 The low-temperature reaction path may also play an important role near the lean oil flameout limit.…”
In this study, a kerosene surrogate model fuel containing 73% ndodecane, 14.7% 1,3,5-trimethylcyclohexane, and 12.3% n-propylbenzene (percentage in mass) is developed by considering both the physical and chemical characteristics of practical aviation kerosene. By combining the small-size C 0 −C 4 (carbon number) core mechanism and the large hydrocarbon submechanisms, a low-and high-temperature chemical kinetic mechanism including 43 species and 136 reactions is constructed for the kerosene surrogate model fuel. The performance of the 43-species mechanism is validated by examining various experimental ignition delay times and laminar flame speeds of single component of n-dodecane and practical kerosene. The predicted main species concentrations during the oxidation process in the jet-stirred reactor by this small-size mechanism exhibit generally acceptable performance with the corresponding experimental data of RP-3 kerosene. The results of brute force sensitivity analysis indicate that the mechanism retains key reaction paths. This relatively small size can be applied to the simulation of computational fluid dynamics to further explore the practical problems of aviation fuel application in engine.
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