Study on Unsteady Flow and Pressure Pulsation in a High-Pressure Fuel Aviation Turbine Pump

To understand the unsteady flow characteristics of a high-pressure aviation turbine pump across its entire operating range, numerical simulations were conducted to analyze the internal pressure pulsation. The validity of the simulation method was verified by comparing the predicted results with experimental performance data of the pump. Pressure at key locations within the pump was monitored, and time-frequency characteristics of the pressure pulsation were analyzed using Fast Fourier Transform (FFT). Additionally, changes in the unsteady flow structures within the pump were analyzed using indicators such. The results showed that under the design flow condition, the dominant frequency of pressure pulsations in the impeller flow passage was the rotational frequency. Different monitoring points exhibited similar fluctuation patterns. On the other hand, the overall flow within the pump was relatively stable under the design flow condition. However, under low flow conditions, vortex flows appeared in the impeller flow passage, primarily near the exit region close to the volute tongue.