Study of full and truncated aerospike nozzles on performances at different working conditions

6th ModTech International Conference - Modern Technologies in Industrial Engineering

Dumitrescu, O.^1 ; Gherman, B.^1 ; Dragan, Valeriu^1

National Research and Development Institute for Gas Turbines, COMOTI, 220 D Iuliu Maniu Bvd., Bucharest, Romania^1

关键词: Aerospike nozzle;    CFD analysis;    Laval nozzles;    Optimum performance;    Plug truncation;    Pressure variations;    Propulsion system;    Space-launching;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/400/4/042017/pdf
DOI  :  10.1088/1757-899X/400/4/042017

来源: IOP

【 摘 要 】

Aerospike nozzles have been a spinoff the plug nozzle alternative for propulsion systems that require adaptation for outside pressure variations. Their capacity to adapt their aerodynamics without the need of moving parts makes them very interesting for space launching vehicles. Conventional Laval nozzles have to trade-off performance as they cross the atmosphere from sea level to their maximum altitude. In this study, the flow simulation is carried out for full and truncated nozzle. Three cases for the truncated length are chosen: 40%, 50% and 60% plug in different working conditions. In over-expansion conditions, with the increase of plug truncation a loss of thrust is observed, compared with the under-expansion conditions, were the nozzle truncation has a negligible effect. CFD analysis shows which plug truncation is giving the optimum performances and how great is the influence of altitude and temperature on this type of propulsion system.