【摘要】 液体火箭发动机是空间活动的重要技术基础。为了满足下世纪空间活动商业化的需要，航天运载器对推进系统提出了更高的要求，液体火箭发动机正面临着新的发展机遇和挑战。概述了液体火箭推进系统的主要技术问题，指出需要进行的一些改进和发展，以适应未来的需要。更多还原

【Abstract】 The progress in space technologies is based on rocket propulsion technologies to a great extent. Nowadays liquid rocket engines become main power of launch vehicles in terms of their inherent merits in performance, reliability, economy and flexibility. In order to meet the requirements for space commercialization in the coming century, the space transportation needs more advanced rocket propulsions, that presents significant challenges and opportunities to liquid rocket engines. The paper briefs the main technical issues and trends related to liquid propulsion systems for launch vehicles.更多还原