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从“阿波罗”任务到航天飞机项目,美国国家航空航天局(NASA)一直以液态氢作为运载火箭上面级的燃料。其原因很简单:氢能是最有效的推进剂,能够提供比其它燃料更强的推力。但是,液氢燃料的使用需要雄厚的专业技术作为支撑。首先,氢必须在低于-253℃的温度下才能保持液态。因此,在发射期间,液态氢必须与外部热源隔绝,以避免液态氢蒸发。其次,液态氢的使用还
From the “Apollo” mission to the space shuttle project, NASA has been using liquid hydrogen as a carrier rocket fuel above. The reason is simple: hydrogen is the most effective propellant and offers stronger thrust than other fuels. However, the use of liquid hydrogen fuels requires strong technical expertise as a support. First, hydrogen must remain liquid at temperatures below -253 ° C. Therefore, liquid hydrogen must be isolated from external heat sources during firing to avoid vaporization of liquid hydrogen. Second, the use of liquid hydrogen also