Optimization of the process chain for the design of axial compressors

W. Riéra, A. SchmitzDLR - Institute of Propulsion Technology - Fan and Compressor

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Contents

Introduction

I. Axial compressor design1. The existing tools2. The design process

II. Duct optimization1. Fundamental principles for the duct optimization2. The duct optimization process

III. From a duct to a 3D blade1. Automated profile optimization2. 3D blade creation

Conclusion & outlook

Introduction

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Contents

Introduction

I. Axial compressor design1. The existing tools2. The design process

II. Duct optimization1. Fundamental principles for the duct optimization2. The duct optimization process

III. From a duct to a 3D blade1. Automated profile optimization2. 3D blade creation

Conclusion & outlook

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The existing tools

Axial compressor design

ACDC-2D (Advanced Compressor Design Code)

Solves the differential equations of the radial equilibrium and the continuity equation of a duct

Correlations for :• the total pressure losses • the deviation for a profile

Second order computation

Real gas module in option

Still in development…

Writes the boundary conditions and the first draft profiles for MISES

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The existing tools

Axial compressor design

MISES

Solver for airfoils in cascades from the M.I.T.

Coupled viscous / inviscid Eulermethod for profile design

AutoOpti

Automatic optimizer from the DLR

Based on an evolutionary algorithm

6Axial compressor design

The design process

ParamVar / ACDC-1D

ACDC-2Dor Ductflow

MISES(solver for blade profiles)

BladeGenerator(from profiles to a 3D blade)

G3Dmesh(meshing)

GMC (pre-processing)TRACE (solver)

Automatic optimization

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Contents

Introduction

I. Axial compressor design1. The existing tools2. The design process

II. Duct optimization1. Fundamental principles for the duct optimization2. The duct optimization process

III. From a duct to a 3D blade1. Automated profile optimization2. 3D blade creation

Conclusion & outlook

8Duct optimization

Fundamental principles for the duct optimization

Find the best duct configuration : • Increase the pressure ratio for the compressor• Decrease losses

by changing :• The duct geometry• The flow turning of each blade (input for ACDC-2D)

Based mainly on already existing tools

9Duct optimization

The duct optimization process

UserDefinedRestrictionUserDefinedFunction :

Manage the geometrical changes

Python program :Check geometry

Bash script and Regions of interest :

Check results

ACDC-2D solver

S2Generator Mesh modifier

Changeflow turning

Change geometrical

values

Original mesh

Modified mesh

Computed solution

AutoOpti

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Contents

Introduction

I. Axial compressor design1. The existing tools2. The design process

II. Duct optimization1. Fundamental principles for the duct optimization2. The duct optimization process

III. From a duct to a 3D blade1. Automated profile optimization2. 3D blade creation

Conclusion & outlook

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Automated profile optimization

From a duct to a 3D blade

Profile in MISESConfiguration settings automated for a profile

optimization with AutoOpti•Fits the boundary conditions •Adapts to the geometry of each profile

Automatic launch of the optimization on the cluster •Reduce the losses•Reach the required exit angle from ACDC-2D

Second operating point available in option

Optional : export only one k-line and/or one blade

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3D blade creation

From a duct to a 3D blade

Post processing

Use the optimized profiles and BladeGenerator to create a 3D blade

3D blades are adapted to the duct and ready for a 3D computation

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Outcome :

A program for the parameter study of axial compressors was written and implemented in ACDC-1D.

The preliminary compressor design was optimized with :• a process chain for a duct optimization • an automated profile optimization• an automated creation of 3D blades from the optimized profiles

Next steps :

Focus on the post processing

Implement other options for users and improve the code

Intensive tests on different compressor configurations

Conclusion & outlook

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Thank you for your attention!