氢泵预冷的数值模拟

NUMERICAL STIMULATION OF CHILLDOWN HYDROGEN PUMP

In this paper, the finite element method is used to calculate transient temperature field distribution of hydrogen pump chilldown in liquid rocket engine before the engine starts. Chilldown flux and cnilldown time are related to consuming of liquid hj'drogen. If chilldown flux or time is not enough, it may produce bad effect on engine start's reliability. If excessive liquid hydrogen were consumed, payload would be diminished. Therefore, eifectively reducing chilldown time has important engineering value. In order to simplify the complicated structure of hydrogen pump, this paper establishes a two-dimension axial symmetry mathematical model, the results obtained by this model fit well with the experimental data, it is confirmed that the mathematical and physical model are correct, and calculation method and computer program are reliable. It is possible to diminish chilldown time in present engineering condition. The numerical calculation analyses transient temperature changing regular pattern of inner wall of hydrogen pump. This result plays an active part in researching chilldown time. In addiation, this paper achieves a good experience by numerical calculation partially replacing material model experiment It will serve the ground experiment much better.