ロケットエンジン用タービンの高信頼性化に関する研究

抄録

To improve the launch capability of rocket, rocket engine turbines are required to have high efficiency and high reliability. In reality it is quite difficult to achieve these two goals at the same time. In quest for highly efficient and reliable rocket turbine, the present authors have performed time-accurate calculation using Transient Blade Row (TBR) method of the commercial software ANSYS CFX to investigate unsteady flow behaviors in the two types of turbine stages (so called reference turbine and optimized turbine). This study then attempts to conduct detailed structural analyses of the 1^st and 2^nd stage turbine blades under the influence of unsteady fluid forces caused by rotor-stator interaction phenomena. Frequency response analysis is performed using the unsteady fluid forces calculated by ANSYS CFX, and the structural analyses are executed by use of MSC Nastran. In the analyses, two materials (Inconel 718 and Ti-6Al-4V) are adopted as blade material.