idw – Informationsdienst Wissenschaft

Nachrichten, Termine, Experten

Grafik: idw-Logo
Science Video Project
idw-Abo

idw-News App:

AppStore

Google Play Store



Instance:
Share on: 
07/16/2024 10:43

Increased fire risk during astronautic space missions

Birgit Kinkeldey Presse- und Öffentlichkeitsarbeit
Zentrum für angewandte Raumfahrttechnologie und Mikrogravitation (ZARM)

    A research team from the Center of Applied Space Technology and Microgravity (ZARM) at the University of Bremen has investigated the risk of fire on spacecraft in a recent study. The results show that fires on planned exploration missions, such as a flight to Mars, could spread significantly faster than e.g. on the International Space Station (ISS). This is due to the planned adjustment to a lower ambient pressure on spacecraft.

    "A fire on board a spacecraft is one of the most dangerous scenarios in space missions," explains Dr. Florian Meyer, head of the "Combustion Technology" research group at ZARM. "There are hardly any options for getting to a safe place or escaping from a spacecraft. It is therefore crucial to understand the behavior of fires under these special conditions."

    The ZARM research team has been conducting experiments on the propagation of fires in reduced gravity since 2016. The environmental conditions are similar to those on the ISS - with an oxygen level in the breathing air and an ambient pressure similar to that on Earth, as well as forced air circulation. These earlier experiments have shown that flames behave completely differently in weightlessness than on Earth. A fire burns with a smaller flame and spreads more slowly, which means it can go unnoticed for a long time. However, it burns hotter and can therefore also ignite materials that are basically non-flammable on Earth. In addition, incomplete combustion can produce more toxic gases.

    Oxygen and air flow as fire boosters

    Future space missions are currently being planned with modified atmospheric conditions. The crew will be exposed to lower pressure. This offers two crucial advantages: The astronauts can prepare for an external mission more quickly and the spacecraft can be built lighter, i.e. with less mass, which saves fuel. The disadvantage: at lower pressure, the crew needs a higher proportion of oxygen in the breathing air - and this can have dangerous consequences in the event of a fire. We know from various everyday situations that the speed of the air flow also has a strong influence on the spread of fire, from lighting barbecue charcoal to fighting wild fires.

    The current series of experiments on which the study is based was carried out under microgravity conditions in the Drop Tower Bremen. Florian Meyer and his team observed the propagation of flames after lighting acrylic glass foils and investigated how the fire reacts when one of the three parameters - ambient pressure, oxygen content and flow velocity - is changed in different proportions. The results of the experiments are clear: although the lower pressure has a dampening effect, the fire-accelerating effects of the increased oxygen level in the air predominate. Increasing the oxygen level from 21 percent (as on the ISS) to the planned 35 percent for future space missions will cause a fire to spread three times faster. This means an enormous increase of the danger to the crew in case of a fire accident.

    Florian Meyer emphasizes: "Our results highlight critical factors that need to be considered when developing fire safety protocols for astronautic space missions. By understanding how flames spread under different atmospheric conditions, we can mitigate the risk of fire and improve the safety of the crew."


    Contact for scientific information:

    Dr. Florian Meyer
    florian.meyer@zarm.uni-bremen.de


    Original publication:

    https://www.sciencedirect.com/science/article/pii/S1540748924001664


    More information:

    http://YouTube: https://youtube.com/shorts/ONZ63dkLr3k?si=pDVIKWjPkL75L0l_


    Images

    Fire on a spacecraft
    Fire on a spacecraft
    AI generated
    ZARM, University of Bremen

    The image shows an ignited acrylic glass sheet during a microgravity experiment in the Drop Tower Bremen (left: sideview; right: front view).
    The image shows an ignited acrylic glass sheet during a microgravity experiment in the Drop Tower Br ...
    Florian Meyer
    ZARM, University of Bremen


    Criteria of this press release:
    Business and commerce, Journalists, Scientists and scholars, Students, Teachers and pupils, all interested persons
    Mechanical engineering, Physics / astronomy, Traffic / transport
    transregional, national
    Research results, Transfer of Science or Research
    English


     

    Fire on a spacecraft


    For download

    x

    The image shows an ignited acrylic glass sheet during a microgravity experiment in the Drop Tower Bremen (left: sideview; right: front view).


    For download

    x

    Help

    Search / advanced search of the idw archives
    Combination of search terms

    You can combine search terms with and, or and/or not, e.g. Philo not logy.

    Brackets

    You can use brackets to separate combinations from each other, e.g. (Philo not logy) or (Psycho and logy).

    Phrases

    Coherent groups of words will be located as complete phrases if you put them into quotation marks, e.g. “Federal Republic of Germany”.

    Selection criteria

    You can also use the advanced search without entering search terms. It will then follow the criteria you have selected (e.g. country or subject area).

    If you have not selected any criteria in a given category, the entire category will be searched (e.g. all subject areas or all countries).