Abstract
The thermal environment inside a fully-enclosed subway noise barrier shall be designed according to underground section tunnel standards. This article constructs a model using practical examples, simulates calculations on fully-enclosed noise barrier installations both with and without air vents via a threedimensional numerical simulation method, and then conducts a comparative analysis of the effects noise barrier lengths and air vent widths have on an internal thermal environment. The calculation results show that when the length of the fully-enclosed noise barrier without air vents was 100m, the internal thermal environment exceeded the limit; as the width of the air vents increased, the temperature in the internal environment gradually decreased, but the reduction was less once the air vent width exceeded 2 m; When the top air vent width was 2 m, and the noise barrier length was 100m, the thermal environment was found to meet requirements. As the noise barrier length increased, the internal air temperature exceeded the standards by varying degrees.
Highlights
A fully-enclosed noise barrier is the best measure for controlling noise pollution in elevated sections in the subway, where noise can be reduced by more than 20 dB [1,2,3,4,5]
Once the fully-enclosed noise barrier is applied, the elevated section can form a closed space with only two ends of it directly connected with the atmosphere, which is similar to an underground section tunnel
The thermal environment problem in a fully-enclosed noise barrier is a complex physical problem that is coupled with multiple physical phenomena, such as heat radiation, heat transfer, and flow. It is an engineering problem with a complex structural form, making it difficult to conduct calculations directly using theoretical methods. According to this problem’s characteristics, this research introduced a three-dimensional numerical simulation calculation method based on computational fluid dynamics (CFD) [6,7], utilizing practical projects as examples, and researched the thermal environment in a fully-enclosed subway noise barrier
Summary
A fully-enclosed noise barrier is the best measure for controlling noise pollution in elevated sections in the subway, where noise can be reduced by more than 20 dB [1,2,3,4,5]. The thermal environment problem in a fully-enclosed noise barrier is a complex physical problem that is coupled with multiple physical phenomena, such as heat radiation, heat transfer, and flow. It is an engineering problem with a complex structural form, making it difficult to conduct calculations directly using theoretical methods. According to this problem’s characteristics, this research introduced a three-dimensional numerical simulation calculation method based on computational fluid dynamics (CFD) [6,7], utilizing practical projects as examples, and researched the thermal environment in a fully-enclosed subway noise barrier
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