Turbomachinery Applications with STAR-CCM+ Turbomachinery Sector Manager

Transcription

1 Turbomachinery Applications with STAR-CCM+ Fred Mendonça Fred Mendonça Turbomachinery Sector Manager

2 An Integrated Solution The applications of the software seem to be infinite. The user-friendly A single integrated software environment interface makes it easy to learn and a very powerful tool. Sean Alexander, Solar Turbines Incorporated Having used several industrial CFD codes over the past 18 years, I have always found CD-adapco to be the best all round provider. As well as producing high quality software, their training and support is consistently excellent and ahead of the competition Dr Allan Thomson, Wood Group Geometry handling, CAD fixing, automated meshing Pre-processing, multi-physics and post processing Integrated into existing process Seamless integration with other software Blade modeling Optimization

3 from interaction Across the Industry STAR-Konferenz Deutschland 2009, Berlin 9-10 Nov. 2009

4 The Solution of Choice for Turbomachinery Applications

5 Simulation in the Turbo Industry: Templated and automated meshing FOR DESIGN - Templated mesher for axial and radial devices with tip clearances FOR ANALYSIS - 3D CAD import, surface repair, surface re- meshing and automated volume meshing based on trimmed hexahedra and polyhedra

6 Simulation in the Turbo Industry: Applications Turbomachinery and hydropower Compressors and turbines Steady-state and efficient transient Using segregated and coupled solvers Single and multistage devices Primary, internal and leakage flows Conjugate Heat transfer Complete performance map Periodic flows including flutter Combustion Transitional flows Aero-hydroacoustics Under nacelle

7 Some recent validations and case studies

8 Validated Simulation: Radial Compressor Comparison with rig measurements Full performance curve RPM range Pres ssure Ratio (t/t) P2 2c/P1c rpm rpm rpm rpm rpm 200k181kpa rpmchoke rpm95kpa Corrected Air Flow (Kg/s)

9 Validated Simulation: Radial Compressor Installation effects! Curved inlet duct Diffuser outlet RPM RPM

10 Validated Simulation: Axial Compressor NASA Rotor37 AGARD-AR-355 Comparison of High-Re and Low-Re wall resolution Comparison of turbulence models Pressure ratio Isentropic efficiency

11 Innovative Designs: Axial Compressor NASA Rotor37 Groove analysis Aimed at improving low mass-flow performance Pressure ratio Isentropic efficiency STAR-Konferenz Deutschland 2009, Berlin 9-10 Nov. 2009

12 AITEB-2 WP4.2 turbine blade end-wall cooling Solution Timescales from blind start CAD to CHT Polyhedral mesh : 3 HOURS CHT Polyhedral Volume solution : 2 DAYS Hexahedral solution (fluid only) : 3 rd DAY Volume Meshes CAD Solutions Surface remesh STAR-Konferenz Deutschland 2009, Berlin 9-10 Nov. 2009

13 Blade Pressure Distribution AITEB-2 WP4.2 turbine blade end-wall cooling Blade Outer wall Absolute Pressure Comparison 1.1 Blade outer wall plane at z = 96.8% Ps / P CFD - FLUENT (Non-Conjugate) EXPERIMENT CFD - CCM+ (Conjugate) CFD - CCM+ (Non-Conjugate) X-Coordinate (m) STAR-Konferenz Deutschland 2009, Berlin 9-10 Nov. 2009

14 Wind Turbine Blade sections - NACA The NACA profile is chosen because it demonstrates a bucket-feature in the C D -C L curve. Trimmed mesh 40,000 cells STAR-Konferenz Deutschland 2009, Berlin 9-10 Nov. 2009

15 Wind Turbine Blade sections - DU 91-W2-250 The DU 91-W2-250 profile is a dedicated wind turbine airfoil with a relative thickness of 25%. STAR-Konferenz Deutschland 2009, Berlin 9-10 Nov. 2009

16 Harmonic Balance Rational for fast transient analysis of periodic flows Devices are commonly multi-row and multi-stage Stator/mounts and rotors commonly have unequal pitches Steady-state methods mix-out or freeze the interaction between stator and rotor. This is inaccurate, but efficient Transient methods overcome the inaccuracies by sliding the mesh at the interface between stator and rotor. This is accurate, but inefficient, especially when the number of stators and rotors are unequal Harmonic Balance, specifically for periodic flows affords both benefits of efficiency and accuracy. Typically costs 1/10 th of equivalent transient Current implementation is for ideal gases only STAR-Konferenz Deutschland 2009, Berlin 9-10 Nov. 2009

17 Harmonic Balance: Stator-Rotor Wake Interaction D4 compressor Hodson turbine

18 Harmonic Balance: Flutter Flutter implementation For aerodynamic damping Imposed flutter modes Distorting mesh Variable Inter-blade phase angle

19 Harmonic Balance: Flutter Flutter implementation For aerodynamic damping Imposed flutter modes Distorting mesh Variable Inter-blade phase angle

20 Summary 1st level CD-adapco continues to pursue 2nd Level Integrated, Automated, Innovative» 3rd Level solutions for the Turbomachinery Industry - 4th Level Many thanks for your Attention