Surging Behavior of Gas Turbines

Abstract

Using the lumped-parameter Greitzer model, most compressor surging behavior (for classic or deep surge) can be estimated. However, this model is too simple, since, in general, the rotor flow passage length is longer for high-pressure compressors than that for low-pressure ones, and modern high-pressure compressors have a strong axial pressure gradient distribution in the flow passage. Dealing with the above, this paper aims to suggest a multielement model to which a Greitzer model is applied for each element, and explain relationships between the surging behavior and compressor flow field time constant, by comparing the results from the Greitzer model and the experiments of the aircraft gas turbine with a relatively high-pressure compressor.