Computational analysis of flow field characteristics of a liquid rocket unshrouded impeller

29th IAHR Symposium on Hydraulic Machinery and Systems

Negishi, H.^1 ; Ohno, S.^2 ; Fukuda, T.^3 ; Ogawa, Y.^4

Research Unit III, Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA), Tsukuba, Ibaraki

305-8505, Japan^1

Ryoyu Systems Co. Ltd., Minato-ku, Tokyo

108-0074, Japan^2

Daiichi System Engineering Co. Ltd., Sakae Naka-ku, Nagoya, Aichi

460-0008, Japan^3

H3 Project, Space Technology Directorate I, Japan Aerospace Exploration Agency (JAXA), Tsukuba, Ibaraki

305-8505, Japan^4

关键词: Computational analysis;    Flow coefficients;    Flow field characteristics;    Liquid rocket engines;    Liquid rockets;    Reynolds-averaged navier-stokes simulations;    Shrouded impeller;    Unshrouded impellers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/3/032048/pdf
DOI  :  10.1088/1755-1315/240/3/032048

来源: IOP

【 摘 要 】

The unshrouded impeller applicable to liquid rocket pumps is a new technology compared to the conventional shrouded impeller widely used in existing liquid rocket engines. Although many past studies have investigated head/suction performance, the rotordynamic and axial forces acting on unshrouded impellers, the detailed flow field in unshrouded impellers, and particularly the influence of the compressibility of hydrogen have yet to be discussed. This paper describes the application of three-dimensional compressible Reynolds-averaged Navier-Stokes simulations to investigate the detailed flow field in a liquid rocket hydrogen pump with an unshrouded impeller. First, the computed results were validated relative to the experimental results obtained in the LE-X hydrogen pump test. Then, the detailed flow field was investigated by comparing the computed results at two different flow coefficients. The computed results agreed well with the experimental results, and revealed several key features of the flow field in the unshrouded impeller.