YF-79

YF-79
Country of origin	China
Designer	Beijing Aerospace Propulsion Institute
Associated LV	Long March 9
Predecessor	YF-75D
Status	In development
Liquid-fuel engine
Propellant	Liquid oxygen / Liquid hydrogen
Mixture ratio	6.0
Cycle	Closed Expander Cycle
Configuration
Chamber	1
Nozzle ratio	160
Performance
Thrust, vacuum	250 kilonewtons (56,000 lbf)
Chamber pressure	7.0 MPa (1,020 psi)
Specific impulse, vacuum	455.2 seconds (4.464 km/s)
Used in
	Long March 9
References
References

The YF-79 is a liquid cryogenic rocket engine burning liquid hydrogen and liquid oxygen in a closed expander cycle. It is China's fourth generation of upper stage cryogenic propellant engine, after the YF-73, YF-75 and the YF-75D. It can do multiple restarts thanks to an electric spark igniter and a prototype was tested at 60% and 100% (25 tonnes-force (250 kN; 25 LTf; 28 STf)) thrust levels in December 2021.¹

It will be used on the third stage of the Long March 9.

References

Xin, Zhang. "我国重型运载火箭25吨级膨胀循环氢氧发动机首台推力室挤压试验取得圆满成功" [First thrust chamber test firing of China's heavy launch vehicle 25-tonne hydrogen-oxygen expansion cycle engine a complete success] (in Chinese). Archived from the original on 2021-12-22. Retrieved 2021-12-22.
Brügge, Norbert (2021-12-22). "An overlook to China's new generation of Rocket Engines". b14643.eu. Archived from the original on 2021-12-22. Retrieved 2021-12-22.
崔荣军,何伟锋. "25吨级膨胀循环发动机技术方案研究". 导弹与航天运载技术2015年06期. Retrieved 2021-12-23.
褚宝鑫,赵海龙,陈旭扬,龚杰峰 (2022-01-05). "25tf膨胀循环氢氧发动机研制进展" (in Simplified Chinese). 《火箭推进》2022年02期. Archived from the original on 2024-11-11. Retrieved 2022-06-05.{{cite web}}: CS1 maint: multiple names: authors list (link)

External links

Engine Manufacturer Archived 2020-02-18 at the Wayback Machine

[weixin202112221228-1] Xin, Zhang. "我国重型运载火箭25吨级膨胀循环氢氧发动机首台推力室挤压试验取得圆满成功" [First thrust chamber test firing of China's heavy launch vehicle 25-tonne hydrogen-oxygen expansion cycle engine a complete success] (in Chinese). Archived from the original on 2021-12-22. Retrieved 2021-12-22.

[b14643-chinanewengines-2] Brügge, Norbert (2021-12-22). "An overlook to China's new generation of Rocket Engines". b14643.eu. Archived from the original on 2021-12-22. Retrieved 2021-12-22.

[yf79-3] 崔荣军,何伟锋. "25吨级膨胀循环发动机技术方案研究". 导弹与航天运载技术2015年06期. Retrieved 2021-12-23.

[rocketpropulsion-4] 褚宝鑫,赵海龙,陈旭扬,龚杰峰 (2022-01-05). "25tf膨胀循环氢氧发动机研制进展" (in Simplified Chinese). 《火箭推进》2022年02期. Archived from the original on 2024-11-11. Retrieved 2022-06-05.{{cite web}}: CS1 maint: multiple names: authors list (link)

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