Influence of combined compressor and turbine deterioration on the overall performance of a jet engine using RANS simulation and Pseudo Bond Graph approach

Jan Goeing,Hendrik Seehausen,Sebastian Lueck,Jens Friedrichs,Vladislav Pak,Joerg R. Seume

doi:10.33737/jgpps/131109

Abstract

In this study, numerical models are used to analyse the influence of isolated component deterioration as well as the combination of miscellaneous deteriorated components on the transient performance of a high-bypass jet engine. For this purpose, the aerodynamic impact of major degradation effects in a high-pressure compressor (HPC) and turbine (HPT) is modelled and simulated by using 3D CFD (Computational Fluid Dynamics). The impact on overall jet engine performance is then modelled using an 1D Reduced Order Model (ROM). Initially, the HPC performance is investigated with a typical level of roughness on vanes and blades and the HPT performance with an increasing tip clearance. Subsequently, the overall performance of the jet engines with the isolated and combined deteriorated domains is computed by the in-house 1D performance tool ASTOR (AircraftEngine Simulation for Transient Operation Research). Degradations have a significant influence on the system stability and transient effects. In ASTOR, a system of differential equations including the equations of motion and further ordinary differential equations is solved. Compared to common ROMs, this enables a higher degree of accuracy. The results of temperature downstream of the high-pressure compressor and low-pressure turbine as well as the specific fuel composition and the HP rotational speed are used to estimate the degree and type of engine deterioration. However, the consideration of the system stability is necessary to analyse the characterisation in more detail. Finally, a simplified model which merges two engines with individual deteriorated domains into one combined deteriorated engine, is proposed. The simplified model predicts the performance of an engine which has been simulated with combined deteriorated components.

Highlights

The degradation of jet engines results in performance losses, higher emissions, decreasing safety limits, and shortening of life cycles
Many sub projects are working together to produce a digital twin of a turbofan jet engine to analyse the impact of deteriorated components on the overall performance, aerodynamics, aeroelastics, and structural dynamics for the virtual repair process (Schwerdt et al, 2019; Goeing et al, 2020)
This study investigates the V2500-A1 turbofan by International Aero Engines (IAE)

Summary

Introduction

The degradation of jet engines results in performance losses, higher emissions, decreasing safety limits, and shortening of life cycles. Goeing et al | Influence of deterioration on jet engine performance http://www.journalssystem.com/jgpps/,131109,0,2.html. These methods are exemplified using the V2500-A1, a mature high-bypass turbofan jet engine operated by the Institute of Jet Propulsion and Turbomachinery (IFAS) (Spuhler et al, 2019). In the CRC 871, the full regeneration process is formed by a real and a virtual repair process (Denkena et al, 2019). Many sub projects are working together to produce a digital twin of a turbofan jet engine to analyse the impact of deteriorated components on the overall performance, aerodynamics, aeroelastics, and structural dynamics for the virtual repair process (Schwerdt et al, 2019; Goeing et al, 2020)

Methods

Results

Conclusion