Simplified-reaction model calculation method of alternative fuel of RP-3 aviation kerosene

Abstract

The invention discloses a simplified-reaction model calculation method of alternative fuel of RP-3 aviation kerosene, and belongs to the technical field of aviation propulsion. According to the method, chemical-reaction mechanism simplification methods such as steady-state approximation, partial equilibrium, sensitivity analysis and path analysis are adopted, starting from selection of the alternative fuel of the RP-3 aviation kerosene and detailed chemical-reaction mechanisms thereof, a highly efficient calculation method of constructing simplified chemical-reaction mechanisms is given, and asimplified chemical-reaction model of the alternative fuel of the RP-3 aviation kerosene is constructed. The simplified reaction mechanisms which are of the alternative fuel of the RP-3 aviation kerosene and are constructed by the method are high in calculation efficiency, are accurate in results, can be directly used in numerical simulation of combustion flow fields, and provide effective technical support for design and analysis of a hypersonic propulsion system.

Description

technical field [0001] The invention relates to the technical field of aviation propulsion, in particular to a simplified reaction model calculation method for RP-3 aviation kerosene substitute fuel. Background technique [0002] As the junction of aerospace technology, scramjet technology involves many disciplines and is a high degree of integration of many cutting-edge technologies. For consideration of reaction rate, calorific value, and cooling capacity, hydrocarbon fuels, especially complex hydrocarbon fuels, will be used in engines operating at Mach 4-8 conditions. The mixing, ignition and combustion process of hydrocarbon fuel in the combustion chamber of scramjet includes a series of complex flow phenomena such as severe shock wave discontinuity and multi-component rapid chemical reaction. It is a complex turbulent mixing process and is strongly affected. controlled by the chemical kinetics of the fuel. [0003] As a widely used hydrocarbon fuel, aviation kerosene ...

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Problems solved by technology

[0006] (1) 79% n-decane, 13% trimethylcyclohexane, and 8% ethylbenzene are used as alternative fuels for RP-3. The simplified mechanism includes 22 components and 18 steps of total package reactions. The reaction model included There are too few chemical reaction pathways to accurately express the complex mechanism of the fuel combustion process;

[0007] (2) The alternative model of 73% n-dodecane, 1,3,5-trimethylcyclohexane, and 12.3% n-propylbenzene, including 138 species and 530 reactions, the components contained in the reaction model And the number of reactions is too large, and excessive computing resources are required to be consumed in numerical simulation;

[0008] (3) n-decane fuel, single fuel, cannot accurately reflect the physical properties of aviation kerosene, and the chemical reaction model used as an alternative fuel cannot accurately express the chemical characteristics of the slow reaction components in aviation kerosene

[0009] In summary, in the prior art, there is a lack of a chemical reaction model that can accurately reflect the characteristics of RP-3 aviation kerosene and has a relatively simplified detailed mechanism, which can meet the requirements of high calculation efficiency and accurate results

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