## 3 Analysis of Results and Discussion
### Analysis of the Influence of the Gas Baffle on Gas Leakage Monitoring
#### 3.1.2 Analysis of the Impact of Air Baffles on Hazardous Areas  
The spread of a gas leak will create a corresponding danger zone in the cabin. Under unventilated conditions, when the hazardous area of gas concentration in the cabin spreads to a certain extent, it usually increases the risk of explosion, so without ventilation, it is necessary to consider how to slow down the expansion of the hazardous area; while under ventilated conditions, it is desired that the gas in the hazardous area is discharged by the air outlet as soon as possible through the action of wind flow. In order to study the effect of the gas baffle on the hazardous area, the following simulations were carried out. Figure 7: The relationship between CH\({}_{4}\) concentration and time change at monitoring points at different leakage locations. (1) No wind  
In order to study the effect of adding a gas baffle on the CH\({}_{4}\) hazardous area (mass fraction not less than 0.005) under non-ventilated conditions, the leak hole was located at the midpoint of the two monitors, and a simulation was carried out with a ventilation wind speed of 0 m/s, a leak velocity of 50 m/s, and a baffle height of 0.5 m. The distribution of the gas chamber danger zone for a leak duration of 10 s is shown in Figure 8 (marked at the downstream monitoring point in the figure). By comparing Figure 8a,b, it can be seen that under unventilated conditions, the gas leak spreads uniformly to both sides after diffusion. With the addition of gas baffles, the dangerous area of gas concentration will be confined to the zone between the gas baffles for a certain period of time due to the blocking effect of the gas baffles, and the expansion rate of the dangerous area will be reduced. At the same time, with the addition of the gas baffle, in the event of a leak in the gas cabin, the leaking gas will be confined to the leak detection zone formed between two adjacent gas baffles, but as the zone does not constitute a confined space, the safety can be guaranteed to a certain extent. However, it should be noted that, depending on the requirements of the gas cabin, the air venting requirements, etc., the zone formed by the two gas baffles cannot be confined to the gas all the time and, at a certain length, the gas will continue to spread downstream outside the zone. (2) Normal wind  
Considering the effect of the additional gas baffle on the CH\({}_{4}\) hazardous area under normal ventilation, the ventilation air velocity was adjusted to 1.38 m/s. The distribution of the hazardous area in the gas cabin when the leak lasts for 10 s is shown in Figure 8.  
By comparing Figure 8 and 9, it can be seen that under normal ventilation conditions, as opposed to unventilated conditions, no dangerous areas of gas concentration appear upstream of the leak source, which also verifies the effectiveness of the ventilation measures. Additionally, based on the safe area that appears at the top in Figure 9, it can be judged that the position of the monitor that first alarms is subject to multiple factors such as ventilation wind speed, gas density, and the location of the leak hole, there is a possibility that the position of the monitor that first alarms is shifted back and may not be the closest downstream. According to Figure 9a,b, under normal ventilation conditions, a continuous leak for 10 s will result in the hazard area spreading 31 m without the baffle and 37 m with the addition of the baffle, creating a larger safety zone on the leeward side of the baffle, while the gas that would have been stored in this area continues to spread downstream, to a certain extent facilitating the spread of the gas and preventing it from collecting inside the corridor. At the same time, the location of the second monitoring point where an alarm response occurs is shifted back due to the enlargement of the top safety zone.