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International researchers have discovered a new type of burning cold flame that may lead to cleaner, more efficient engine technology. This discovery was completed by the team of the University of California, San Diego, on the International Space Station, and the leader is Professor William Fors, a professor of mechanical and aerospace engineering. A better understanding of the cold flame can help improve the internal combustion engine of the car, for example by developing homogeneous charge compression ignition, which is currently not used in automobiles. The fuel burns at a lower temperature, which brings less pollutants such as soot, nitric oxide and nitrogen dioxide.
In the experiment, the researchers ignited a drop of heptane fuel. At first, the flame looked like it was extinguished, but the sensor showed that heptane was still burning, but this cold flame was invisible to the naked eye. Toxic products from the combustion reaction, such as carbon monoxide and formaldehyde, are completely burned. The researchers believe that the cold flame is only the result of a chemical reaction within a short period of time. The difference between Earth and space station is gravity. After the fuel on the earth burns, the gas evaporates due to the high temperature, and under the microgravity, the gas stays around the fuel and continues to participate in the chemical reaction.
The researchers emphasized that this study is only possible on the International Space Station, where scientists have access to a microgravity environment. The lab is full of sensors and is equipped with camera records. Using an experimental setup called the Combustion Integrated Rack, it is similar to the 5.5-foot bookshelf and weighs close to 560 pounds. The recorded data is transmitted to the ground.
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