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Liquid hydrogen engine: power selection for future flight Liquid hydrogen engine is Global trade resource librariesa high efficiency, sustainable power selection, which has been widely used in the field of future flight because of its excellent performance. Unlike traditional fuel power, liquid hydrogen engines release energy through the reaction of liquid hydroxidation. The only exhaust gas produced is water vapor, which also has the advantages of high energy density, cleanliness, safety and so on. In the future aviation field, liquid hydrogen engines will become an irreplaceable power option. The principle of the liquid hydrogen engine is to burn liquid hydrogen and liquid oxygen in the engine to produce water and a large amount of heat energy, transfer high-temperature and high-pressure gas to the turbine, and push the aircraft forward to accelerate. Compared with traditional fuel power, the energy density of liquid hydrogen engines is higher, and the liquid hydrogen fuel itself does not pollute the air and does not produce harmful gases, so the engine's emissions are extremely clean. Moreover, liquid hydrogen engines also have high power and high efficiency because of their high combustion temperature and high mechanical efficiency.The application fields of liquid hydrogen engines are very wide. In the future aerospace field, liquid hydrogen engines are a commonly used propulsion method, such as the propulsion system of rockets, the power system of long-distance space flight, and the orbit adjustment system of space probes, all adopt liquid hydrogen engines. In the field of long-distance flights, liquid hydrogen engines are also widely used. For example, the Boeing 777-200LR, which has the longest flight record, uses a liquid hydrogen engine. In the future, with the continuous progress of science and technology, the advantages of liquid hydrogen engines will be further exerted. At the same time, there will be more and more application scenarios for liquid hydrogen engines. For example, the liquid hydrogen power of electric locomotives, that is, liquid hydrogen fuel cell locomotives, will become one of the new options for urban transportation in the future. In addition, liquid hydrogen engines still have a lot of room for application, which is medium and short-distance flights.Due to the characteristics of high efficiency, low exhaust emissions and low noise of liquid hydrogen engines, it will become an indispensable power choice in the field of medium and short-distance flights. With the development of liquid hydrogen engine technology, not only will there be more small liquid hydrogen engines installed on aircraft in the future, but also more efficient liquid hydrogen engine technology may appear, so as to further improve the performance of liquid hydrogen engines. Although liquid hydrogen engines have a wide range of applications in the future and have many advantages, there are still some challenges to overcome. Among them, the cost of hydrogen production and hydrogen storage are the main bottlenecks in the development of liquid hydrogen engines. At present, the cost of liquid hydrogen production is very high, and the storage of liquid hydrogen requires high pressure and temperature, which is expensive. In order to solve these problems, scientists need to constantly explore new technological ways to reduce the cost of liquid hydrogen production and storage.At the same time, more support is also needed from the government and enterprises, including increasing investment, formulating more liquid hydrogen engine policies, etc., to accelerate the application of liquid hydrogen engines in the future flight field. In a word, liquid hydrogen engines, as an efficient and sustainable power option, have been widely used in the field of future flight. Despite the challenges and bottlenecks, the development of liquid hydrogen engines is still unstoppable. I believe that with the continuous progress of science and technology, liquid hydrogen engines will definitely become an indispensable power choice in the future aviation field.

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