What is the main fuel of the rocket, what are its advantages and disadvantages, and the current development direction is. . .

Fuel is nitrogen oxides, including: Co, H2, C2H2, CH4, C2H4, CH3H2OH, N2H4 and advanced borosilane (all fuels in rocket propulsion). Ignition and principle are the same as kicking, except that the top layer is not gunpowder but rocket head (there is a satellite-like thing inside). Aviation kerosene is colorless and transparent, smells no different from ordinary kerosene and is non-volatile. The ignition point is around 300C, let alone flint, even if there is an open flame, it is nonflammable! What power does the launch vehicle use to send the spacecraft into space? Long before the invention of launch vehicles, people used oil and steam as fuels, and cars, ships and planes were driven by these fuels. Later, scientists invented a launch vehicle powered by chemical energy. The launch vehicle uses kerosene, alcohol, unsymmetrical dimethylhydrazine and liquid hydrogen. As a combustion agent, the oxidant provided by nitric acid and liquid nitrogen is used to support combustion. People are used to calling combustibles and oxidants the fuels or propellants of rocket engines.

Physically speaking, there are two forms of propellant used in rocket engines, one is liquid and the other is solid. An engine in which both combustion agent and oxidant are liquid is called a liquid fuel engine or a liquid rocket engine, and both are solid, so it is called a solid fuel rocket engine or a solid rocket engine. If one of the two fuels is solid and the other is liquid, it is called a solid-liquid rocket engine or a rocket engine named directly after its substance. Such as hydrogen-oxygen rocket engines. Because the energy produced by solid combustion agent is higher than that produced by liquid oxidant, most of the rocket engines developed at present are solid-liquid rocket engines. The two fuels meet and burn to form high-temperature and high-pressure gas, which is ejected from the nozzle, generating huge thrust and sending the launch vehicle into space.