高压进气离心压气机失速特性数值模拟研究OA

To investigate the influence of unsteady flow on the operating range of a centrifugal compressor,a high-pressure inlet centrifugal compressor is selected as the research subject for a detailed analysis.This compressor employs a closed impeller design,and numerical simulations are conducted using CFX to examine the stall phenomenon at low flow rates and its impact on performance.The study explores the causes of stall under high-pressure inlet conditions and its behaviors during transient operations.The results indicate that the stall phenomenon primarily originates from flow separation at the leading edge of the blades,which subsequently affects the stability of the flow within the passage.Further analysis of both steady-state and transient flow fields reveals the nonlinear characteristics of pressure fluctuations during stall conditions,and investigates the relationship between low-frequency oscillations induced by stall and the blade passing frequency.These findings provide a theoretical foundation for optimizing the design of centrifugal compressors and enhancing their performance,while also laying the groundwork for future exploration of stall control strategies.