For many years, the aerospace industry has worked on the development of rockets powered by solid fuels. These have many advantages, such as simplicity, long life and high thrust-to-weight ratio. However, they have a huge drawback. Once these fuels start burning, they continue to do so until they are spent. There is no way to stop and restart the reaction, as is normally done in space maneuvers.
Despite everything, a group of scientists from the Aerospace Corporation, the University of Southern California and the Naval Postgraduate School has been working in the development of new generation solid fuels, in which there are solutions for each of these drawbacks. At the moment, they only have a proof of concept in the laboratory, but that first experimental development has given very good results.
The problem. Solid fuels are blocks of solid propellant that already include within them the oxidizing substance that, with the necessary spark, starts the combustion reaction. The problem with these fuels is that, once they start burning, there is nothing to stop them and restart them. It would be useful to use electricity to dictate when combustion starts and stops, but until now that has not been possible.
An ingredient and a mechanism. These scientists have developed their solid fuel with the help of an ionic liquid polymer. Although this is manipulated to form part of a solid matrix, it retains the electrical conductivity properties of the molten salts with which it was manufactured.
On the other hand, this new solid fuel undergoes a process known as nanosecond pulsed plasma discharge (NPPD). In this process, very short, very high voltage pulses are generated, lasting less than 100 nanoseconds, giving rise to an ionization process in which we obtain plasma as a product.
Then what? NPPD plasma is generated in the gas of the combustion zone. During ionization, electrons and free radicals are generated that, thanks to the ionic conductivity of the propellant, can interact with the flame front and control combustion. This can be stopped or reactivated by activating or interrupting the electrical pulses.
Other advantages. Other great advantages of these fuels is that, due to their compact shape, they can be integrated into all types of space platforms, from CubeSats even large ships.
The most benefited. Although many agencies and companies could jump on the solid fuel bandwagon if they become viable, the small ones will benefit the most. satellite operatorssince they normally cannot afford a complex liquid propellant-based upper stage in their rockets.
Although they are simpler, they also need to maneuver, turning combustion on or off in steps such as orbit insertion. Solid fuel engines are simpler and can be cheaper. If the problems they already have are solved, they will become a real revolution for big and small fish.
Image | 中央通訊社
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