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氢和氧反应能放出大量的热,燃烧生成物的分子量很小,该反应提供的比推力比任何化学推进剂都大,且不破坏生态循环,不污染环境。因此,液氢是理想的洁净燃料。目前,中、苏、日、法(欧洲13国)、美等国家,都先后在宇宙开发中使用了液氢-液氧发动机(氢-氧发动机,即第二代发动机)。
The reaction of hydrogen and oxygen can release a large amount of heat, and the molecular weight of the combustion product is very small. The specific thrust provided by this reaction is larger than that of any chemical propellant and does not damage the ecological cycle and does not pollute the environment. Therefore, liquid hydrogen is the ideal clean fuel. At present, China, the Soviet Union, Japan, France (Europe 13 countries), the United States and other countries have all used liquid hydrogen-liquid oxygen engines (hydrogen-oxygen engines, ie second-generation engines) in the development of the universe.