Design and experiment of the turbopump bearing used in reusable liquid rocket engines
The demand for the development of reusable liquid rocket engines has put forward higher re-quirements for the reliability design of turbopump structures.Aiming at the problem of failure of bearings in turbopumps under harsh working conditions such as low temperature,high speed,heavy load,and re-peated start-stop,a certain type of reusable liquid oxygen kerosene rocket engine turbopump was taken as the research object,the design and dynamic simulation analysis of turbopump bearings were carried out from the aspects of structure,material,and retainer.Based on the working conditions of the turbopump,a low-temperature and room-temperature bearing operation test system was designed,and repeated start-stop operation tests were conducted.During the test,the bearing temperature and operating speed were monitored to determine the bearing status.After the test,the bearing steel balls and raceways were checked to be normal,and the bearing design parameters were retested and found to have no significant deviation.The experimental results show that the designed turbopump bearings can complete the prede-termined repeated start-stop operation at the design speed,and at the same time,the same batch of bear-ings were successfully tested with engines,and ignition was repeated more than ten times.
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维普
