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Calculation method of collision frequency at different temperatures in flow field model

A technology of collision frequency and calculation method, which is applied in the field of flow field and electromagnetic field, can solve the problem of difficult collision frequency of plasma sheath, and achieve the effect of large temperature coverage and efficient calculation process

Active Publication Date: 2020-09-01
XIDIAN UNIV
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Problems solved by technology

Therefore, there are difficulties in the actual calculation of the collision frequency of the plasma sheath

Method used

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  • Calculation method of collision frequency at different temperatures in flow field model
  • Calculation method of collision frequency at different temperatures in flow field model
  • Calculation method of collision frequency at different temperatures in flow field model

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] This paper takes the 7-component Park-85 air chemical reaction model (the 7-component air chemical reaction model proposed by Park in 1985) and the two-temperature model as examples.

[0034] A method for calculating the collision frequency at different temperatures in a flow field model is carried out according to the following steps:

[0035] Step 1, use CFD-FASTRAN and other flow field simulation software to simulate the flow field around the hyperso...

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Abstract

The invention discloses a computing method for collision frequencies under different temperatures in a flow field model. A 7-component Park-85 air chemical reaction model and a double-temperature model are employed. A flow field around a hypersonic aerocraft is simulated, thereby obtaining a coordinate of each flow field node position and particle number density and electron temperature distribution data of corresponding positions; data extraction is carried out on corresponding momentum transfer cross section graphs under different electron volt energy of each component, thereby obtaining momentum transfer cross section data under different electron volt energy of each component; the momentum transfer cross section graph of each component is drawn and polynomial fitting is carried out; and electron and neutral particle collision frequencies of the corresponding positions of the flow field are obtained according to the obtained momentum transfer cross sections of neutral particles, theelectron temperatures and particle number density of each component. In a process of practically calculating plasma collision frequencies, the process is relatively rapid, efficient and accurate.

Description

technical field [0001] The invention belongs to the technical field of flow field and electromagnetic field, and in particular relates to a calculation method of collision frequency at different temperatures during the conversion process of a flow field model and an electromagnetic model. Background technique [0002] When a hypersonic vehicle flies at high altitude, it will be subjected to great air resistance. The gas in the head of the vehicle, the front of the cockpit, and the front of the wings will be squeezed violently, resulting in strong friction between the gas and the surface of the vehicle, and a strong bow-shaped shedding will be formed at the front of the vehicle. body shock. At the same time, the high kinetic energy will be converted into internal energy, so that as the temperature of the gas increases, various internal energy modes become active, such as the dissociation of diatomic molecules and ionization. [0003] During the reentry process (the process o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/20
CPCG06F30/15G06F30/20Y02T90/00
Inventor 韩一平陈安涛孙浩宇吴哲锋吴娜艾夏崔志伟汪加洁赵文娟
Owner XIDIAN UNIV
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