backdraft

简明释义

英[ˈbækdrɑːft]美[bækdræft]

n. 倒转（回程）；反向气流

英英释义

单词用法

同义词

反义词

例句

1.Two other poses were tried and I emerged from the booth to find photos of me as indiana Jones a fireman from backdraft and a wrestler being strangled in a headlock.

又试了两个其它的姿势后，我从拍照亭里出来，看到了我扮印第安纳·琼斯的照片——《回火》中的一个消防队员和一个被紧紧卡住脖子的搏斗者形象。

2.The simulation experiment and theoretical analysis show that backdraft is able to break out in the underground roadway network fire.

采用实验模拟和理论分析的方法证明了煤矿井巷火灾过程中同样存在回燃现象。

3.Two other poses were tried and I emerged from the booth to find photos of me as Indiana Jones, a fireman from Backdraft and a wrestler being strangled in a headlock.

又试了两个其它的姿势后，我从拍照亭里出来，看到了我扮印第安纳·琼斯的照片——《回火》中的一个消防队员和一个被紧紧卡住脖子的搏斗者形象。

4.Two other poses were tried and I emerged from the booth to find photos of me as Indiana Jones, a fireman from Backdraft and a wrestler being strangled in a headlock.

又试了两个其它的姿势后，我从拍照亭里出来，看到了我扮印第安纳·琼斯的照片——《回火》中的一个消防队员和一个被紧紧卡住脖子的搏斗者形象。

5.Industries we have fabricated Backdraft Dampers for include the petrochemical, power generation and construction industries.

我们制造回转阻尼器适用于行业包括石化，发电和建筑业。

6.During the training session, we learned how to identify signs of a backdraft 回流火 before attempting to extinguish the flames.

在培训课程中，我们学习了如何在试图扑灭火焰之前识别回流火的迹象。

7.The closed windows created the perfect conditions for a backdraft 回流火 in the house.

关闭的窗户为房子内的回流火创造了完美的条件。

8.After the explosion, the fire chief explained that the rapid influx of oxygen caused a backdraft 回流火 that endangered the crew.

爆炸后，消防队长解释说，氧气的快速涌入导致了一个回流火，这使得队员们处于危险之中。

9.Understanding the dynamics of a backdraft 回流火 is crucial for effective firefighting.

理解回流火的动态对于有效灭火至关重要。

10.The firefighter warned the team about the potential backdraft 回流火 as they entered the burning building.

消防员在他们进入燃烧的建筑时警告团队关于潜在的回流火。

作文

Firefighters often face numerous challenges when battling blazes, and one of the most dangerous phenomena they encounter is known as backdraft. A backdraft occurs when a fire in a confined space has consumed all the available oxygen and is on the verge of extinguishing. If fresh air is suddenly introduced—such as when a door or window is opened—the fire can reignite explosively. This sudden influx of oxygen can cause the flames to flare up violently, creating a hazardous situation for anyone nearby. Understanding the mechanics of a backdraft is crucial for firefighters and emergency responders in order to minimize risks and save lives.The science behind a backdraft is rooted in the principles of combustion. Fire needs three elements to ignite: heat, fuel, and oxygen, commonly referred to as the fire triangle. In a typical fire scenario, these elements work together to sustain the blaze. However, when a fire burns in a closed environment, it can deplete the oxygen supply, leading to a phase where the fire seems to die down. At this point, the temperature remains high, and combustible materials are still present. When a door is opened, allowing fresh air to enter, the sudden surge of oxygen can trigger a rapid combustion reaction, resulting in a violent explosion known as a backdraft.Firefighters are trained to recognize the signs that a backdraft may occur. These signs can include smoke that is thick and dark, an absence of visible flames, and an unusual buildup of heat near the ceiling. Additionally, firefighters are taught to use tactics such as ventilation to safely manage the situation. Proper ventilation techniques can help to reduce the risk of a backdraft by allowing smoke and heat to escape before introducing fresh air into the environment.In recent years, there have been several notable incidents involving backdrafts that highlight the dangers they pose. For instance, during a residential fire in a suburban neighborhood, firefighters opened a door to search for trapped occupants. Unbeknownst to them, the fire had been smoldering in the attic, and the sudden rush of air ignited the accumulated gases, resulting in a massive explosion. Fortunately, the firefighters were trained to recognize the signs, and they managed to escape without serious injuries. This incident serves as a stark reminder of the importance of understanding backdrafts in firefighting operations.In conclusion, the phenomenon of backdraft is a critical concept in fire safety and firefighting. It illustrates the complex interplay between fire dynamics and the environment in which a fire occurs. By recognizing the signs and employing strategic ventilation techniques, firefighters can effectively reduce the risks associated with backdrafts. As we continue to learn more about fire behavior, it is essential to prioritize training and education to ensure the safety of both firefighters and the communities they serve. Understanding backdrafts not only enhances firefighting strategies but also contributes to the overall effectiveness of emergency response efforts.

消防员在扑灭火灾时常常面临许多挑战，其中一个最危险的现象被称为回流火。回流火发生在一个封闭空间内，火焰消耗了所有可用的氧气，并即将熄灭。如果突然引入新鲜空气，比如打开门或窗户，火焰可能会以爆炸性的方式重新点燃。这种氧气的突然涌入可能导致火焰猛烈地重新燃烧，给附近的任何人创造了危险的局面。理解回流火的机制对于消防员和应急响应人员至关重要，以便最大限度地降低风险，拯救生命。回流火的科学原理根植于燃烧的基本原理。火焰需要三个元素才能点燃：热量、燃料和氧气，通常被称为火三角。在典型的火灾场景中，这些元素共同作用以维持火焰。然而，当火焰在封闭环境中燃烧时，它可能会耗尽氧气供应，导致火焰似乎熄灭的阶段。在这一点上，温度仍然很高，易燃材料仍然存在。当一扇门被打开，引入新鲜空气时，氧气的突然涌入可以触发快速的燃烧反应，导致被称为回流火的剧烈爆炸。消防员接受过识别回流火可能发生的迹象的培训。这些迹象包括烟雾浓厚且黑暗、没有可见的火焰，以及靠近天花板的不寻常的热量积聚。此外，消防员还被教导使用通风等战术来安全管理这种情况。适当的通风技术可以帮助减少回流火的风险，通过让烟雾和热量在引入新鲜空气之前逃逸。近年来，有几起涉及回流火的显著事件突显了它们所带来的危险。例如，在一个郊区社区的住宅火灾中，消防员打开一扇门寻找被困的居民。他们不知道，火焰在阁楼中一直在冒烟，空气的突然涌入点燃了积聚的气体，导致了一次巨大的爆炸。幸运的是，消防员经过训练能够识别这些迹象，他们设法在没有严重受伤的情况下逃脱。这一事件清晰地提醒我们，在消防行动中理解回流火的重要性。总之，回流火现象是消防安全和灭火中的一个关键概念。它展示了火焰动态与火灾发生环境之间复杂的相互作用。通过识别迹象并采用战略性通风技术，消防员可以有效降低与回流火相关的风险。随着我们对火焰行为的了解不断加深，优先考虑培训和教育以确保消防员及其服务社区的安全至关重要。理解回流火不仅增强了灭火策略，还促进了应急响应工作的整体有效性。