Experimental device for simulating isothermal coupling process of two airflows under underground railway environment by use of liquid

Abstract

The invention relates to an experimental device for simulating an isothermal coupling process of two airflows under an underground railway environment by use of a liquid. Three water pipe openings are arranged on a sealed water tank of a model station system C equidistantly, a backwater opening and four overflow openings are arranged on the right sidewall of the sealed water tank, and a water inlet is arranged on the left sidewall of the sealed water tank; an underground railway station model piston wind system A is as follows: the backwater opening of the right sidewall of the sealed water tank is sequentially connected with a water pump, a valve I, an electric regulating valve, a rotor flowmeter I and a valve II through a pipeline, and the water inlet of the left sidewall of the sealed water tank is connected with the distal end of the pipeline; and a model station ventilation jetting system B comprises a water storage tank provided with three water outlets, wherein the three water outlets are respectively sequentially connected with the water pump, the valve and the rotor flowmeter through pipelines, and a water pipe opening I, a water pipe opening II and a water pipe opening II of the sealed water tank are respectively connected with the distal ends of the three pipelines. A liquid model experimental table utilized by the experimental device disclosed by the invention has a suitable size, and the result is reliable, so that effective manners are provided for complex station airflow organization research in a design operation process of the underground railway.

Description

technical field [0001] The present invention relates to the research field of thermal environment of indoor airflow organization, in particular to the use of liquid to simulate two airflows in the thermal environment of a subway, that is, the platform air supply jet (steady-state airflow) and the piston wind (intermittent airflow) generated by trains running in interval tunnels. Forced unsteady airflow), the experimental device isothermally coupled on the platform. Background technique [0002] As an important means of transportation, the subway is widely used in large and medium-sized cities at home and abroad because of its fast, safe, convenient and pollution-free advantages. The coupling of the piston wind caused by the pressure difference between the front and rear of the train running in the section and the supply air flow of the station ventilation system is a typical feature of the airflow organization of the subway thermal environment, which widely exists in the pla...

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Problems solved by technology

On-site measurement is restricted by on-site factors such as vehicle conditions during the test period and passengers at the station, and it is difficult to analyze the changing laws of physical phenomena; numerical simulation is limited by the establishment of physical models and the setting of boundary conditions, and the reliability of the research results needs to be verified by other studies. Verification of means; it is more complicated to build a subway gas scale model test bench including interval tunnels, platforms and station halls, and the change law of airflow in small sizes is quite different from the size of the prototype

In addition, since the viscosity coefficient of air is an order of magnitude smaller than that of water, the geometric size of the gas scale experiment device is relatively large and takes up more space

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