유체베어링을 적용한 액체로켓엔진 터보펌프 설계: 적용가능성 연구

Abstract

Liquid rocket engine turbopumps are a critical component of launch vehicle technology. Corrosion-resistant ball bearings have been used widely in tycial turbopump designs. However, large friction at high speed and limited lifespan of ball bearings pose challenges to reusability and durability. As an alternative, externally pressurized fluid film bearings have been considered, with successful implementation in turbopumps of liquid rockets developed in some parcicular engine applications. This study investigates the design cases of fluid film bearing-supported turbopump rotor systems. The design considerations include the characteristics of various journal and thrust bearing types, the rotordynamic coefficients required in cryogenic propellant environments, internal bearing geometry design, and surface coating. Accurate analysis of operating requirements, including propellant properties, operating conditions, and the influence of seals on rotordynamic behavior, are discussed. This study aims to contribute to the development of liquid rocket engine turbopumps with enhanced lifespan, durability, and reusability through the application of fluid film bearing technology.