Aerodynamic Design And Optimization Of Low-pressure Compressor For A Intercooled Gas Turbine

Gas turbine has the advantages of small volume,high output power,and low emission.Compressor is one of the essential components of gas turbine.For dual-rotor gas turbines,the low-pressure compressor is at the forefront of the compression system compared to the core compressor(high-pressure compressor),and the requirements for its aerodynamic performance and stable operating range are more stringent.For the intercooled circulation method of a driven gas turbine particularly,the intercooler's intervention makes it difficult to ensure a stable operating margin for the gas turbine under low operating conditions.This brings great difficulty to the aerodynamic design of the low pressure compressor.It is necessary to study the aerodynamic design method of the low pressure compressor with stable work over a wide working range,so as to realize the improvement of the overall performance index of the gas turbine.The design and research process of this paper is mainly based on the compressor automatic pneumatic design platform of Harbin Engineering University.This paper focuses on a compressor aerodynamic design including 1D design and analysis,S2 flow surface inverse design,blade modeling,full 3D CFD analysis and the arrangement of variable guide vane schedule by adoption of modern CFD technology and optimize algorithm.Firstly,a large number of experimental data were compiled based on the DOE method,and the regression equation equation was simulated.The quantitative relationship between the one-dimensional aerodynamic parameters and the overall compressor efficiency was summarized,and a parameter distribution with guiding significance was obtained.Secondly,this dissertation fulfilled the aerodynamic design of a multi-stage low pressure compressor and gives the full flow field analysis of the compressor.As the result of the 3D CFD analysis,the efficiency of the LPC is 88.98% with a surge margin of 11.6% at the off-design condition which meet the design specification.Finally,the study of the off-design condition performance of the designed LPC and variable guide vane schedule design was carried out.By combine 1D character analysis program and modern optimize software,a variable guide vane schedule optimize system was built and provide a good reference to the design and verification of the arrangement of variable guide vane schedule.