Session: 32-08 Fan & Propulsor Design

Paper Number: 103856

103856 - Part I: Validation and Verification of Cfd Analysis for Nasa Sdt Transonic Fan Stage Test Rig 

The airframe and engine are a tightly coupled system that are unfortunately designed in isolation.  It is only during a final installation testing that the interaction effects of the airframe and the engine are quantified.  There are many reasons for the separation of effort, but one blocker is a validated model that incorporates best practice methodologies for both the airframe and engine as well as the amount of time it takes to run the simulations.

 

The NASA SDT (Source Diagnostic Test) was used for CFD code validation as it provides data that spans from an operating map of a standard turbomachinery rig to a fully coupled nacelle/fan configuration with multiple operating lines.

 

In this paper, the geometry for the NASA SDT transonic fan stage with baseline OGV geometry was  analyzed using standard best practice methodologies for turbomachinery.  The results are compared against experimental 1D mean performance and 2D radial profiles at multiple operating lines and used to validate a the CFD model for turbomachinery rig.

 

Extending the validated model for the turbomachinery, the nacelle geometry with baseline nozzle position is included into the analysis and compared against experimental operating line.  Multiple free stream operating conditions are executed, and distortion sensitivity is evaluated.  Coupled nacelle analysis showed that effects of higher boundary layer buildup and changes in the stagnation point on flow entering the nacelle can cause efficiency losses between 1% and 3% or more.

 

Turnaround time was substantially increased using GPGPU acceleration enabling a full turbomachinery operating map to completed in under 6.5 hours and a single operating point of the nacelle/turbomachinery simulation completed in 5 minutes.

The validation and verification of the NASA SDT gives us the opportunity to use our best practices and go from a standard turbomachinery analysis to a coupled nacelle/fan simulation with confidence as we build up the model.

Presenting Author: Gregorio Robles Vega ADS CFD Inc

Presenting Author Biography: Gregorio is a senior CFD engineer at ADS CFD Inc. He has an MS in mechanical engineering from the University of Kentucky

Authors:

Gregorio Robles Vega ADS CFD Inc
Daryl Y. Lee ADS CFD Inc
Michael Ni ADS CFD Inc.
Ron Ho Ni ADS CFD Inc