NUMERICAL SIMULATION OF THE INFLUENCE OF STEAM INGESTION ON COMPRESSOR STABILITY USING A CORRECTED CORRELATION METHOD

摘要

In order to simulate the stall boundary of a compressor more accurately under steam ingestion condition, a two-dimensional stability analysis model is developed. The model simulates compressor flow by solving compressible, two-dimensional, unsteady Euler equations with appropriate source terms. Normally, viscosity is considered for compressor flow when compressor characteristics, expressed by the Navier-Stokes equations or experiments, are used to calculate the source terms, and engineering applications pay more attention to compressor characteristics rather than detailed flow field. Therefore, the control equations are assumed to be non-viscous in this work. A corrected correlation method that does not need numerous computations under different proportions of steam is proposed at present. The method reflects the effects of gas properties on the compressor characteristic lines - a quality absent in traditional correlation method. It is most significant for the paper to adopt the proposed corrected correlation to reduce the number of independent parameters that describe compressor characteristics under different proportions of steam compared with the traditional correlation. Then the source terms associate with compressor inlet parameters by adopting the corrected correlation method to establish a modified model. The model is used to calculate the stall boundary under steam ingestion, and the results are compared with clean condition to investigate the effects of steam properties on stall boundary. As more steam is ingested, the corrected similar flow increases at the stall point while the total pressure ratio decreases when total temperature distortion remains constant. If you want to describe compressor characteristics under ingesting other gases, just modify these parameters related to gas properties in the corrected correlation.