Pressurizer Stall Signal Analysis
Wei Li · 2024
High pressure ratio, high efficiency and high stability are the typical characteristics of axial-flow pressurizer, but when the boost ratio reaches a certain value under a certain rotational speed, the pressurizer enters into an unstable working state, which leads to a dangerous situation such as stall or wheezing, so it is especially important to analyze the stall signal of the pressurizer and the stall prediction. Compared with the traditional Fourier transform, wavelet analysis can decompose the signal in the frequency domain and analyze the mutation of the detailed signal in the time domain. Therefore, this paper adopts the time-frequency-wavelet method to analyze the three kinds of working conditions of the pressurized gas engine at the near-design point, the near-stall point and the complete stall, and the results show that when the pressurized gas engine enters into the stall state, the static pressure at the trailing edge is negatively correlated with that at the leading edge; at the beginning of the stall, the static pressure at the leading edge shows a negative correlation with that at the beginning of the stall. The results show that when the pressurizer enters the stall state, the static pressure at the trailing edge and the static pressure at the leading edge are negatively correlated numerically, and the sharp impulse sign before the start of the stall can be the early warning for judging that the pressurizer enters the stall state.