Numerical simulation method for plate impact jet flow heat transfer problem

A numerical simulation and impingement jet technology, which is applied in CAD numerical modeling, complex mathematical operations, electrical digital data processing, etc., can solve the difficult Nusselt number distribution of flat impingement jets and the inability to accurately predict the Nusselt number of impinging plates. Er number distribution and other issues to achieve the effect of improving accuracy

Active Publication Date: 2018-03-23
DALIAN UNIV OF TECH
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Problems solved by technology

Early numerical calculations of impinging jets found that the traditional model and the standard model cannot accurately predict the Nusselt number distribution on the impinging plate surface when calculating the plate impinging jet heat transfer problem
With the development of computer...

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  • Numerical simulation method for plate impact jet flow heat transfer problem
  • Numerical simulation method for plate impact jet flow heat transfer problem
  • Numerical simulation method for plate impact jet flow heat transfer problem

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specific Embodiment approach

[0049] (1) Establish calculation model

[0050] According to the experimental data, the flat impact jet model including the adiabatic impact surface and the closed plate is established; the experimental model is selected as an example verification, the nozzle width is 0.04m, the impact height is 4 times and 9.2 times the nozzle width, and the length of the impact plate is 50 times the nozzle width.

[0051] (2) Grid division of the model and verification of grid independence

[0052]Grid division is carried out in ICEM, and the grid type adopts structured grid, such as figure 2 shown. According to the selected SSTk-ω turbulence model, select a set of y arranged from large to small + Carry out grid independence verification and use ICEM for grid division. Import the divided mesh into ANSYS-FLUENT for trial operation until two adjacent y + The results of the calculated local Nusselt number of the impact plate are similar, so the smaller y is selected + As the optimal grid...

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Abstract

The invention discloses a numerical simulation method for a plate impact jet flow heat transfer problem. The method comprises the following steps that: S1: establishing a calculation model, and according to experimental data, establishing a plate impact jet model which contains a thermal insulation impact face and a sealed plate; S2: carrying out grid division and grid independence verification onthe model; S3: setting a turbulence model, and selecting an SSTk-[Omega] model to be coupled with an intermittent transition model, a cross flow transition model and a Kato-Launder model; S4: according to a practical situation, setting a boundary condition and an initial value; S5: setting the solving way of ANSYS-FLUENT software; and S6: operating the ANSYS-FLUENT, obtaining the heat transfer distribution rule of the plate impact jet flow under different heights, and expressing the heat transfer rule by a dimensionless Nusselt number Nu. By use of the method, the influence of transition on the impact jet flow heat transfer is considered so as to better conform to the physical phenomenon of the impact jet flow heat transfer, and therefore, calculation accuracy is improved.

Description

technical field [0001] The invention relates to the field of fluid technology, in particular to a numerical simulation method for the problem of flat plate impact jet heat transfer. Background technique [0002] The phenomenon of impingement jet heat transfer is ubiquitous and widely used in civil and military fields. Because it has an extremely thin boundary layer in the stagnation zone, it can greatly improve the heat transfer efficiency, so it is widely used in drying of paper and textiles, cooling of gas turbine blades, rapid cooling of hypervelocity aircraft, and cooling of electronic components and wing deicing, etc. In the military field, the launch of unmanned aircraft, the launch of weapons, and the take-off of vertical take-off and landing aircraft are all closely related to the impact jet phenomenon. Accurate numerical simulation of the impinging jet phenomenon is of great significance for optimizing the design based on a deep understanding of the problem mechan...

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Application Information

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IPC IPC(8): G06F17/11G06F17/50
CPCG06F17/11G06F30/20G06F2111/10G06F2119/08
Inventor 张桂勇黄华坤孙铁志回达姜宜辰孙雷孙哲宗智
Owner DALIAN UNIV OF TECH
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