Analysis of Instability Force Mechanism of Ultra High Speed and Ultra High Pressure Non-contacting Seal under Two Phase Flow

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Development of ultra high speed and ultra high pressure turbo-machinery is needed in liquid fuel pump of rocket engine, ultra conductive generator and so on. However nonsynchronous vibration is occured by the instabillity force of non-contacting seal because seal clearance is reduced in order to prevent the leakage loss. In this paper analysis instability force and instability analysis of high performance rotor are experimentally and theoretically perforemed in the case of two phase flow of turbo-pump. From this point of view the following studies are carried out ;(1) Analysis of static and dynamic characteristics of double spiral seal and comparison of the characteristics with experimental results.(2) Analysis of static and dynamic characteristics of two phase flow force through non-contacting seal and stability of rotor under the two phase flow.As the result, the followings are obtained ;(1) Idea of equivalent clearance can be avairable in the analysis of non-contacting seal.(2) Static and dynamic characteristics of two phase flow seal can be theoretically obtained, then stability of pump rotor in the two phase flow can be analyzed.