A kind of urban tunnel ventilation test device and its making method

Abstract

The invention discloses a city tunnel ventilation test device and a manufacturing method thereof. The manufacturing method comprises the following steps: (1) determining the geometric scale(lambda 1 is more than 10 and less than 22) of a model tunnel and an actual model; (2) making a plurality of sections according to the geometric shape of the actual tunnel and splicing the sections into the model tunnel, wherein one wall surface of the model tunnel is made from a transparent material and the other inner wall surfaces of the model tunnel are mounted with abrasive paper; (3) mounting a jet nozzle, a back pressure pipe and a tracer gas tracking mechanism in the predetermined positions of the model tunnel. According to the manufacturing method, the ratio of the model tunnel to the actual tunnel is (1 to 22) to (1 to 10); in the ratio range, on one hand, the flowing of air in the model tunnel can satisfythe properties of a self-model region, and the model tunnel and the actual tunnel are similar in geometricproperty and flowing resistance, so that the model tunnel can accurately simulate the movement of ventilation air flow and a pollutant dispersion law in the actual tunnel; on the other hand, the test cost is relatively low, so that the test operation can beconveniently carried out.

Description

technical field [0001] The invention relates to a tunnel ventilation test device, in particular to an urban tunnel ventilation test device and a manufacturing method thereof. Background technique [0002] In recent years, with the acceleration of urbanization, the urban population is oversaturated, the building space is crowded, the urban greening is reduced, and the traffic pressure is increasing. Traffic congestion has become a prominent problem in many cities in our country. In order to solve the problem of urban traffic congestion, three-dimensional use of space has become a development trend. As an extension and supplement of ground roads, urban tunnels are easy to plan, short in construction period, low in construction cost, easy to connect with existing ground transportation systems, and effectively improve the urban environment. environment and other characteristics and are widely used. The large-scale urban tunnel groups that have been built abroad, such as the Bos...

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Problems solved by technology

[0006] (2) In this method, it is mentioned that "according to the similarity ratio, the sandpaper corresponding to the roughness of the prototype tunnel wall is selected", but the selection method of the sandpaper is not given, which is an unfeasible solution

[0008] (1) CO is toxic and flammable, and there are safety hazards such as poisoning and explosion of test personnel;

[0009] (2), CO is a colorless, transparent gas, which does not have the function of visualizing the gas flow, so that the test personnel cannot observe the characteristics and laws of the pollutant flow;

[0010] (3) CO detection is a contact measurement, which must disturb the flow field to a certain extent and affect its detection accuracy

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