| Citation: | CHEN Yidan，CHEN Hongyu，LIU Yazhou.Cavitation modeling and start⁃up under⁃rated pressure simulation of liquid rocket engine［J］.Journal of Aerospace Power，2022，37（8）：1654‑1663. doi: 10.13224/j.cnki.jasp.20210232
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The NPSH （net positive suction head） was used instead of the inlet pressure as the criterion of cavitation condition for liquid rocket engine cavitation process，and the model with the head drop of 1.25% as occurrence point of fracture cavitation had good prediction accuracy by comparing the simulation with the test results.Subsequently，the engine start⁃up simulation was performed.The results showed that the rated pressure of 62% and above can start normally；the rated pressure of 45% and below failed because the gas generator temperature was too high.There were three periods of severe cavitation in 0.4-0.6 s，0.4-0.85 s and 0.4-1.2 s，respectively，correspondingly to the opening of the main oxidant valve，the rapid climb of the main turbine speed and the fluctuation of the gas generator parameters.The cavitation of the oxygen main pump mainly affected the gas generator and the thrust chamber，secondly affected the fuel supply path assembly，and slightly affected the main turbine.
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