土木工程畢業(yè)設(shè)計外文翻譯---cfd模擬和地鐵站臺的優(yōu)化通風(fēng)（節(jié)選）

1、 外文資料翻譯 第 1 頁CFD simulation and optimization ofthe ventilation for subway side-platformFeng-Dong Yuan *, Shi-Jun YouAbstr

2、actTo obtain the velocity and temperature field of subway station and the optimized ventilation mode of subway side-platform station, this paper takes the evaluation and optimization of the ventilation for subway side-pl

3、atform station as main line, builds three dimensional models of original and optimization design of the existed and rebuilt station. And using the two-equation turbulence model as its physics model, the thesis makes comp

4、utational fluid dynamics (CFD) simulation to subway side-platform station with the boundary conditions collected for simulation computation through field measurement. It is found that the two-equation turbulence model ca

5、n be used to predict velocity field and temperature field at the station under some reasonable presumptions in the investigation and study. At last, an optimization ventilation mode of subway side-platform station was pu

6、t forward.1. IntroductionComputational fluid dynamics (CFD) software is commonly used to simulate fluid flows, particularly in complex environments (Chow and Li, 1999; Zhang et al., 2006; Moureh and Flick, 2003). CFD is

7、capable of simulating a wide variety of fluid problems (Gan and Riffat, 2004; Somarathne et al., 2005; Papakonstantinou et al., 2000; Karimipanah and Awbi, 2002). CFD models can be realistically modeled without investing

8、 in more costly experimental method (Betta et al., 2004; Allocca et al., 2003; Moureh and Flick, 2003). So CFD is now a popular design tool for engineers from different disciplines for pursuing an optimum design due to t

9、he high cost, complexity, and limited information obtained from experimental methods (Li and Chow, 2003; Vardy et al., 2003; Katolidoy and Jicha, 2003). Tunnel ventilation system design can be developed in depth from the

10、 predictions of various parameters, such as vehicle emission dispersion, visibility, air velocity, etc. (Li and Chow, 2003; Yau et al., 2003; Gehrke et al., 2003).外文資料翻譯 第 3 頁model was used to simulat

11、e and analyze in the study. Its geometry model is shown in Fig. 1.2.1. The structure and original ventilation mode of existent stationThe subway has two run-lines. The structure of Southwest Station is, length width hei

12、ght = 74.4 m(L) 18.7 m(W) 4.4 m(H), which is a typical side-platform station. Each side has only one passageway (length height = 6.4 m(L) 2.9 m(H)). The middle of station is the space for passengers to wait for the vehi

13、cle. The platform mechanical ventilation is realized with two jet openings located at each end of station and the supply air jets towards train and track. There is no mechanical exhaust system at the station and air is r

14、emoved mechanically by tunnel fans and naturally by the exits of the station.2.2. The design structure and ventilation of rebuilt stationThe predicted passenger flow volume increase greatly and the dimension of the origi

15、nal station is too small, so in the rebuilding design, the structure of subway station is changed to, (length width height = 132 m(L) 17.438 m(W) 4.65 m(H)), and each side has two passageways. The design volume flow o

16、f Southwest Station is 400000 m3/h. For most existent stations, the platform height is only 2.9 m, which is too low to set ceiling ducts.So in the original design, there are two grille vents at each end of the platform t

17、o supply fresh air along the platform length direction and two grille vents to jet air breadthways towards trains. The design velocity of each lengthways grille vent is 5.54 m/s. For each breadthways vent, it is 5.28 m/s

18、. Under the platform, 80 grille vents of the same velocity (4.62 m/s, 40 for each platform of the station) are responsible for exhaust.3. CFD simulation and optimizationThe application of CFD simulation in the indoor env