Method of simulating heavy gas diffusing among urban streets

A street, heavy gas technology, applied in the field of heavy gas diffusion research

Inactive Publication Date: 2014-01-08
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

Assuming a simulated street area, the near-earth diffusion simulation of ammonia gas is carried out under the condition of stable atmosphere, and the results are relatively close to the actual diffusion results, but this model also has the disadvantage that it can only simulate the near-earth ammonia diffusion

Method used

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  • Method of simulating heavy gas diffusing among urban streets
  • Method of simulating heavy gas diffusing among urban streets
  • Method of simulating heavy gas diffusing among urban streets

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Embodiment Construction

[0043] The outer contour of the model is 110×110m, which is an open boundary without reflection. The source of the leak is at the center of the area (0,0), and the scenario is assumed to be a leak from a tanker transporting liquid ammonia. There are 11 virtual cuboids surrounding the building. Its specific dimensions are as figure 2 shown. After the heavy gas is diffused, the diffusion height of the heavy gas is set to be higher than the height of the building. The diffused air mass spreads from the leakage point to the surroundings, and the leakage rate of the air mass is 10 per calculation step, and a total of 2000 calculation steps are performed.

[0044] For the specific selection of parameters, the leakage rate of the leakage point is 5kg / s, such as the capacity of each air mass is 1kg, which means that the time of each calculation step is 2s. The spraying distance of the leakage point is 1m, after which all liquid ammonia gasifies into heavy gas and begins to diffus...

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Abstract

The invention discloses a method of simulating heavy gas diffusing among urban streets. The method is characterized in that an air mass model based on cellular automata is constructed and used for simulating the heavy gas, macro spreading of the gas is equivalently treated as multiple air masses, and an air mass motion model is generated by the cellular automata; features of the air masses are expressed as Qi (Vi0, xi and yi), influence radius D is determined by a Gaussian model and used for distinguishing concentration gradient diffusion Sd and free diffusion Sf, boundary contact conditions are constructed to assume a simulated urban environment, and the model is used to simulate ammonia diffusion in the atmospheric stable state. The method includes the steps of determining the influence radius D, the air mass automata model, changes in air mass motion speed, and the boundary contact conditions, setting model construction parameters, and simulating. The method is applicable to simulating gas diffusion and distribution under no action of wind when the urban street layout is complex.

Description

technical field [0001] The present invention relates to heavy gas diffusion simulation, especially involving Study on the Diffusion of Heavy Gas in a No-wind Condition in Complex Urban Blocks. Background technique [0002] As we all know, there are several aspects to consider in the risk situation of gas leakage: the density of the gas, the location of the leakage, the surrounding environment and atmospheric conditions of the location, etc. For the density of the gas, if it is less than air, then most of the gas will rise to high altitude after leakage, thereby reducing the impact on the ground; if it is greater than air, then the heavy gas will displace the air, and the displaced air will be partially compressed, resulting in heavy gas Diffusion is slower and has a greater impact on the ground. Considering the location of the leak, it is obvious that densely populated urban areas are more dangerous. If the environment around the leakage point is relatively airti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
Inventor 赵东洋赫飞崔铁军吴迪
Owner LIAONING TECHNICAL UNIVERSITY
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