To find the problem, I decided to set 1 MPa sequentially. And I found the problem. After 8 MPa, a negative fluid current occurs at the outlet and the rotation wheel begins to oscillate strongly, judging by the moment. Earlier, I immediately set 12 MPa at the output and did not understand where the error was. I conclude that setting the outlet pressure above 8 MPa is critical for the pump and impeller.
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