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CFD system based on adaptive reaction mechanism and implementation method

A reaction mechanism and self-adaptive technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of reducing the acceleration effect of the self-adaptive reaction mechanism, limiting the promotion and use of the self-adaptive reaction mechanism, and increasing the numerical simulation of the CFD program. Computational issues, etc.

Pending Publication Date: 2019-07-30
SHANGHAI JIAO TONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

At the same time, most of the current adaptive mechanism methods use real-time simplified methods to obtain simplified mechanism calls according to the current flow field state. On the one hand, it is necessary to use simplified methods such as direct relationship graph method and path flux method in the program, which limits the scope of adaptive reaction mechanism. Popularization and use; on the other hand, it increases the calculation amount of CFD program numerical simulation and reduces the acceleration effect of adaptive reaction mechanism in CFD simulation

Method used

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  • CFD system based on adaptive reaction mechanism and implementation method
  • CFD system based on adaptive reaction mechanism and implementation method
  • CFD system based on adaptive reaction mechanism and implementation method

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Embodiment 1

[0046] Such as figure 1 As shown, it is the system structure of this embodiment. This system includes: a flow solving module, an adaptive mechanism retrieval module, a chemical reaction module, an adaptive mechanism generation module and an adaptive mechanism storage module, wherein: the flow solving module calculates the flow according to the NS equation Field convection flux, viscous flux and update the pressure flow field information and temperature flow field information, the self-adaptive mechanism retrieval module is based on the pressure flow field information and temperature flow field information of the current grid at each grid describing the spatial position of the flow field The information invokes the corresponding adaptive reaction mechanism. The chemical reaction module calculates the chemical reaction and updates the pressure flow field information, temperature flow field information and reaction component information in the flow field according to the correspon...

Embodiment 2

[0061] This embodiment aims at the retrieval efficiency of the adaptive reaction mechanism, that is, searching the corresponding reaction rate parameters by temperature and pressure. The implementation process includes: use random numbers to randomly generate 0.1-10atm, temperature T and pressure P in the range of 900-1800K, cycle 10,000, 50,000, 100,000, 500,000, and 1 million, record the total search time and average single search time.

[0062] The results of this example are shown in Table 1. Retrieval of adaptive mechanisms such as Figure 4 As shown in , it iteratively searches according to the combination of temperature and pressure, and finally finds the partition where the temperature and pressure are located.

[0063]

[0064]

[0065] This embodiment verifies the efficiency of the adaptive mechanism retrieval. Due to the combination with CFD, the additional time consumption is mainly the retrieval time, and the single retrieval time in the test is on the or...

Embodiment 3

[0067] In this example, the temperature change process of H2 / O2 / N2 (molar ratio 2:1:3.76) under different temperature and pressure is calculated for the zero-dimensional ignition process of hydrogen and oxygen, which is used to compare the calculation accuracy of the adaptive reaction mechanism. The implementation process of this embodiment includes: setting the temperature and pressure of the initial reaction as 2atm, 1000K and 2atm, 950K, using the KS mechanism, ES mechanism, and adaptive reaction mechanism to calculate the temperature change process, and recording the program running time.

[0068] In this embodiment 2atm, 1000K conditions correspond to temperature changes such as Figure 7 Shown, present embodiment 2atm, 950K condition corresponding temperature variation is as follows Figure 8 As shown, this embodiment verifies that the calculation results of the adaptive reaction mechanism are significantly improved compared with the ES mechanism, and there are orders of...

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Abstract

The invention discloses a CFD system based on an adaptive reaction mechanism and an implementation method. The system comprises a flow solving module, a self-adaptive mechanism retrieval module, a chemical reaction module, a self-adaptive mechanism generation module and a self-adaptive mechanism storage module, according to reaction conditions, a reaction mechanism is called and can be directly coupled to other CFD platforms for use; the method comprises the following steps: generating an optimization self-adaption mechanism which keeps self-adaption mechanism components and element reaction unchanged, selecting a target detail mechanism and a known simplification mechanism, dividing different reaction areas, selecting zero-dimensional ignition delay time as an objective function, and optimizing known simplification mechanism parameters.

Description

technical field [0001] The present invention relates to a technology in the field of aircraft design, in particular to a Computational fluid dynamics (Computational fluid dynamics, CFD) system and an implementation method based on an adaptive reaction mechanism. Background technique [0002] Aircraft has higher and higher requirements for engine performance, and the numerical simulation of the reaction flow in the combustor has become a research hotspot. Since the detailed reaction mechanism of fuel often contains hundreds of components and thousands of elementary reactions, under the existing CFD algorithm framework, the calculation amount is proportional to the square or cube of the number of components N and the number R of elementary reactions. And the detailed mechanism will cause the differential equation of the chemical reaction source term to be too rigid, so that only small time steps can be used in the CFD calculation to prevent the calculation results from divergi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F30/17
Inventor 张斌刘洪刘成诚何淼生余彬
Owner SHANGHAI JIAO TONG UNIV
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