Improvement of the Parallel Compressor Model and Application to Inlet Flow Distortion

This paper introduces a semi-analytical approach which enables one to deal with distorted inflow in axial fans or compressors. It is inspired by the classical parallel compressor (PC) theory but relies on a local flow-loading coefficient formalism. It is applied to non-uniform flow conditions to study the aerodynamic behavior of a low-speed fan in response to upstream flow distortion. Experimental measurements and 3D RANS simulations are used to evaluate the prediction of fan performance obtained with the local PC method. The comparison proves that, despite its simplicity, the present approach enables to correctly capture first order phenomena, offering interesting perspectives for an early design phase if different fan geometries are to be tested and if the upstream distortion maps are available.

[1]  H. Pearson,et al.  Wakes in Axial Compressors , 1959 .

[2]  V. Pachidis,et al.  A Loss and Deflection Model for Compressor Blading at High Negative Incidence , 2019, Journal of Turbomachinery.

[3]  James L. Felder,et al.  Conceptual Design of a Single-Aisle Turboelectric Commercial Transport With Fuselage Boundary Layer Ingestion , 2016 .

[4]  Devaiah Nalianda,et al.  Discretized Miller approach to assess effects on boundary layer ingestion induced distortion , 2017 .

[5]  Milton Davis,et al.  Validation of a Modified Parallel Compressor Model for Prediction of the Effects of Inlet Swirl on Compressor Performance and Operability , 2015 .

[6]  Jonathan C. Gladin,et al.  Conceptual Design of a BLI Propulsor Capturing Aero-Propulsive Coupling and Distortion Impacts , 2019, AIAA Scitech 2019 Forum.

[7]  K. Mathioudakis,et al.  Axial Compressor Mean-Line Analysis: Choking Modelling and Fully-Coupled Integration in Engine Performance Simulations , 2021, International Journal of Turbomachinery, Propulsion and Power.

[8]  Milt Davis,et al.  DYNamic Turbine Engine Compressor Code (DYNTECC) - Theory and capabilities , 1992 .

[9]  Roger L. Davis,et al.  Computational Approach for Predicting Stall Inception in Multistage Axial Compressors , 2007 .

[10]  Fully Coupled Body Force–Engine Performance Methodology for Boundary Layer Ingestion , 2021 .

[11]  Riti Singh,et al.  Performance Analysis of a Distributed Propulsion System with Boundary Layer Ingestion , 2015 .

[12]  Jens Friedrichs,et al.  Modelling of A Boundary Layer Ingesting Propulsor , 2018 .

[13]  Ye-Bonne Maldonado,et al.  Fuel burn evaluation of a turbo-electric propulsive fuselage aircraft , 2019, AIAA Propulsion and Energy 2019 Forum.

[14]  William T. Cousins,et al.  Evaluating Complex Inlet Distortion With a Parallel Compressor Model: Part 1—Concepts, Theory, Extensions, and Limitations , 2011 .

[15]  Numerical investigation of the effects of fuselage upsweep in a propulsive fuselage concept , 2021, CEAS Aeronautical Journal.

[16]  Anestis I. Kalfas,et al.  Development of a Method for Enhanced Fan Representation in Gas Turbine Modeling , 2011 .

[17]  William T. Cousins,et al.  Evaluating Complex Inlet Distortion With a Parallel Compressor Model: Part 2—Applications to Complex Patterns , 2011 .

[18]  Peter Schmollgruber,et al.  Multidisciplinary Design and performance of the ONERA Hybrid Electric Distributed Propulsion concept (DRAGON) , 2020, AIAA Scitech 2020 Forum.

[19]  A. M. Martínez Fernández,et al.  Effect of a fuselage boundary layer ingesting propulsor on airframe forces and moments , 2020, Aerospace Science and Technology.

[20]  H. Melick.  Analysis of inlet flow distortion and turbulence effects on compressor stability , 1973 .

[21]  Guillaume Dufour,et al.  Body Force Modeling of the Aerodynamics of the Fan of a Turbofan at Windmill , 2016 .

[22]  R. S. Mazzawy,et al.  Multiple Segment Parallel Compressor Model for Circumferential Flow Distortion , 1977 .

[23]  V. Pachidis,et al.  Body-force and mean-line models for the generation of axial compressor sub-idle characteristics , 2020, The Aeronautical Journal.

[24]  Edward M. Greitzer,et al.  Analysis of Fan Stage Conceptual Design Attributes for Boundary Layer Ingestion , 2017 .

[25]  Guillaume Dufour,et al.  Body Force Modeling of the Aerodynamics of a Low-Speed Fan under Distorted Inflow † , 2019, International Journal of Turbomachinery, Propulsion and Power.