a Hydrogen-Turbopump-Powered Thrust Vector Control Servo System For High Thrust LH2/LOX Rocket Engines

摘要

A TVC (Thrust Vector Control) Servo System for high thrust LH2/LOX engines is described, including its architecture, technical characteristics and flight test results. Ultra high speed turbopumps are used to draw high pressure hydrogen gas from the engines and to transform them to hydraulic powerto drive electro-hydraulic servomechanisms. Meanwhile, the low temperature hydrogen gas exhausted from the turbines, where they have expanded and worked, are utilized to exchange heat with and cool down the hydraulic oil, whose temperature is stabilized at the desired range to meet the requirements of long duration flight missions. The simplicity of this power approach also guarantees the system's inherent reliability. Another characteristic of the system is its redundancy design, including triple redundancy in the control loop and dual redundancy in the hydraulic power supply, with SPFs (single point failure) eliminated in critical junctions to improve flight reliability further. The system structure is unique in that power and control components are highly integrated and gas/liquid passages embedded, with simple outside interfaces for convenient maintainability. The system has been tested by hot firing girriballing tests of engines and flights of launch vehicles, showing a highly data consistency with design computations.