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Two-step reaction model calculation method for fuel detonation combustion

A reaction model, fuel detonation technology, applied in the field of aerospace, can solve problems that limit the wide application of two-step reaction models

Active Publication Date: 2021-03-26
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because there is still a lack of a two-step reaction model parameter determination method for actual fuels, that is, a two-step reaction model modeling technology for actual fuels, which greatly limits the wide application of the two-step reaction model in the field of detonation combustion

Method used

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  • Two-step reaction model calculation method for fuel detonation combustion
  • Two-step reaction model calculation method for fuel detonation combustion
  • Two-step reaction model calculation method for fuel detonation combustion

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specific Embodiment 1

[0151] The following table provides P0=1atm calculated according to the modeling method of the present invention, T0=300K, chemically proper ratio ethylene / air uniform premixed gas two-step reaction parameters and two-step reaction model and elemental reaction model detonation combustion characteristic parameters Compared. Simultaneously figure 1 A comparison of the ZND structure temperature of the mixed gas C-J detonation wave with the two-step reaction model and the calculation results of the elementary reaction model is given. Among them, the detonation wave Mach numbers calculated by the two-step reaction model and the elementary reaction model are kept consistent in the modeling. It can be seen that the two-step reaction model obtained by the modeling method of the present invention can well describe the ZND structure of the detonation wave, and the change trend of the two-step reaction temperature curve is very close to the qualitative result of the elementary reaction,...

specific Embodiment 2

[0157] Further, the table below and figure 2 The modeling method of the present invention for the two-step reaction of macromolecular hydrocarbon fuel JP-10 is compared with the elementary reaction model. Also in the modeling, it is ensured that the detonation wave Mach numbers calculated by the two-step reaction model and the elementary reaction model are consistent. The state and fuel composition parameters corresponding to the modeling are P 0 = 1 atm, T 0 =500K, chemically proper ratio JP-10 / air. The combustion process of macromolecular hydrocarbon fuels is very complex. A typical elementary reaction model contains tens to hundreds of components, and the corresponding reactions are on the order of hundreds to thousands. It is very difficult to directly use it for numerical simulation. The two-step reaction model obtained by the modeling method in this paper can describe the shock wave induction and combustion heat release process corresponding to the detonation combust...

specific Embodiment 3

[0163] In order to further verify the two-step reaction model calculation method of the present invention to the actual fuel detonation combustion simulation situation, the two-step reaction model is used to numerically simulate the flow field of the combustion chamber of the rotating detonation engine, and the detonation wave characteristic parameters obtained by the simulation are compared with the basic The results of the meta-reaction model were compared. Also in the modeling, it is ensured that the detonation wave velocity and Mach number calculated by the two-step reaction model and the elementary reaction model are consistent. The state and fuel composition parameters corresponding to the modeling are P0=5500Pa, T0=216K, chemically proper ratio of hydrogen / air premixed gas, wherein the above state parameters correspond to the typical working altitude of the rotary detonation engine H=20km to flow static pressure and static pressure temperature conditions. The following...

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Abstract

The invention provides a two-step reaction model calculation method for fuel detonation combustion, and the method comprises the steps: calculating fuel detonation wave key parameters according to anexisting element reaction model, selecting typical key parameters to construct a fuel detonation combustion two-step induction exothermic reaction model, and verifying the two-step reaction model through an experiment and numerical simulation; enabling the fuel stability parameters corresponding to the two-step reaction model to be consistent with those of the primitive reaction model through modeling, so that it is guaranteed that the two-step reaction model is consistent with the complex primitive reaction model in the aspect of detonation wave stability description, and the focused detonation combustion characteristic parameters can be flexibly selected according to actual problems; and enabling characteristic parameters calculated by the two-step reaction model to be consistent with those of the primitive reaction model, so that the problem that the two-step reaction model simulates an actual fuel detonation combustion physical process is solved, the two-step reaction model gives consideration to simulation precision on the basis of high detonation combustion numerical simulation efficiency, and wide application of the two-step reaction model in the field of detonation combustion and the field of engineering design can be promoted.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a two-step reaction model calculation method for fuel detonation combustion. Background technique [0002] Combustion is the main form of conversion of fuel chemical energy into heat energy, which can be generally divided into two modes: slow combustion combustion and detonation combustion. For slow-burning combustion, the propagation speed of the combustion wave is on the order of meters per second, and the combustion process can usually be approximated as an isobaric combustion process. For detonation combustion, the strong shock wave is closely coupled with the chemical reaction, and its propagation speed can reach the order of kilometers per second, and the combustion process can usually be approximated as a constant volume combustion process. Compared with slow combustion, detonation combustion releases heat quickly, produces a smaller entropy increase, and has higher th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/10G06F30/20G06F111/10
CPCG16C20/10G06F30/20G06F2111/10
Inventor 滕宏辉周林张义宁杨鹏飞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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