该发动机推力达到120吨级,于2012年6月由航天科技集团六院研制成功,以液氧煤油为推进剂,绿色环保优点突出;首次6ES5705-4CB01采用补燃循环、自身起动、变工况调节技术,填补了国内多项技术空白。
其研制成功,缩短了我国液体火箭发动机技术水平与国外的差距,奠定了我国未来航天动力系统发展的技术基础。我国于上世纪90年代开始研制新型的液氧煤油火箭发动机和氢氧发动机,并与2010年前后先后定型,作为长征五号火箭的发动机使用。
6ES5705-4CB01其中,推力50吨的YF-77火箭发动机就是其中的一种主力发动机。氢氧发动机因为携带的燃料种类最轻(得益于液氢的低密度)而具备最大的比冲和最好的性能。尽管氢氧发动机的技术难度较大,但各主要航天大国均在氢氧火箭发动机的开发商取得了不小的进展。
6ES5705-4CB01目前美、俄、日、欧都有各自独立的大推力氢氧发动机型号,其最大推力都在100吨以上。美国的SSME引擎甚至达到了213吨之多。而美国研制之中的RS-68型大推力氢氧发动机推力更是达到338吨。
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