Modeling Of Turbofan Engine Performance At Steady State Based On Test Cell Data

Modeling and simulation of aeroengine have been widely applied during the whole life cycle of aeroengine,and it is of great significance for engine condition monitoring,performance analysis and new type engine research,etc.A component-level modeling of the turbofan engine at steady state is completed by using MATLAB/Simulink simulation software,and object-oriented method is used according to the test cell data of a hybrid exhaust turbofan engine.First,a design point,which is also named cycle reference point,is selected from the engine test cell data with the reference of the engine manufacturer's data.All the unknown performance data for the design point is calculated by using the reverse engineering method,and the Newton-Raphson method is used for solving the common working equation.The simulation modeling converges quickly,the iteration result is accurate which can reach an accuracy up to 10^-6.Then,appropriate component maps are selected.At the design point,scaling method is applied by multiplying the component map data with the scaling factor.The component map is preliminary corrected.For the off-design point,multi-point matching is carried out between component map and the test cell data,and component maps with good accuracy are obtained.With the multi-point matching correction method,the average difference of the steady-state model is reduced from 5.0283%to 1.3776%,and the maximum difference of performance parameters is reduced from 17.97%to 2.58%.The difference of all performance parameters is less than 3%,which meet the engineering requirement of engine modeling.Finally,the interpolation calculation of component maps is performed,and a steady-state model is established.A Varied-Newton-Raphson method is used for calculating the common working equation.And all the engine performance data can be obtained when the iteration finished.The difference of the model is less than 3%,which meets the engineering requirements.Further,the steady-state model is corrected with the real working condition considered,such as,airborne gas extraction,power extraction and installation effects,etc.so that the steady-state model is more accurate and much closer to the working environment.