UTSR Fellowship Christopher J. Paul 05/23/ /12/2011

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1 UTSR Fellowship /23/ /12/2011 Christopher J. Paul Ph.D. Student Department of Mechanical Engineering College of Engineering Michigan State University COPYRIGHT PARKER. YEAR OF COPYRIGHT IS FIRST YEAR INDICATED ON THIS DOCUMENT. ALL RIGHTS RESERVED. August 12 th,

2 Projects Valve Leakage Analysis Airblast Atomizer Parameter Study Spray Cup Analyses References pg.3 pg.4 pg.5 pg.20 2

3 Valve Leakage Analysis Summary A valve cartridge exhibits leakage flows that may impact assembly of the valve during production. The leakage flow calculation in the current valve flow model does not have sufficient refinement to accurately model leakage flow rate. A more sophisticated leakage model was created using CFD analysis. Actual geometries, operating conditions, and results, being proprietary, have not been released. 3

4 Airblast Atomizer Parameter Study Summary A more accurate tool to predict the discharge coefficient of airblast atomizers for a range of geometric parameters was created. The data for the tool was generated by varying geometric parameters and determining the discharge coefficient using 3D CFD analyses. The tool is to be validated with empirical data. Actual geometries, operating conditions, and results, being proprietary, have not been released. 4

5 Tool Spray Cup Analyses New LES analysis of macro-laminated (ML) cup using original mesh to characterize the flow field (original RANS (kωsst) analysis done in 2003) New LES analysis of ML spray cup using a refined mesh with increased resolution The analyses are to be continued due to the length of time needed to generate enough data 5

6 Tool Spray Cup Analyses ML spray cup swirler geometry 6

7 Swirler Spray ACd Cup Prediction AnalysesTool CFD Methodology Fixed 4% pressure drop across circuit Atmospheric conditions Incompressible flow (suitable for 4% p) Analyses run in OpenFoam 7

8 Spray Cup Analyses ML Cup: Original Mesh 2.0 million hexahedral cells Element edge length from m to m Increased resolution of mesh to capture swirler geometry 8

9 Spray Cup Analyses ML Cup: New Mesh 49 million tetrahedral cells Element edge length from m to m Increased resolution of mesh to capture swirler geometry and boundary layers 9

10 Spray Cup Analyses ML Cup New Mesh: Section through swirler 10

11 Z (mm) Z (mm) Spray Cup Analyses ML Cup RANS Flow Field: Mean Axial Velocity in xz plane X (mm) X (mm) LDV Measurement [1] Original CFD (RANS) [1] 11

12 Spray Cup Analyses ML Cup LES Flow Field: Time Averaged Axial Velocity in xz plane LES Analysis Original Mesh 12

13 Spray Cup Analyses ML Cup LES Flow Field: Time Averaged Axial Velocity in xz plane LES Analysis (short time average, run in progress) New Fine Mesh 13

14 Spray Cup Analyses ML Cup LES Flow Field: Velocity Magnitude in xz plane LES Analysis Original Mesh 14

15 Spray Cup Analyses ML Cup LES Flow Field: Velocity Magnitude in xz plane LES Analysis (run in progress) New Fine Mesh 15

16 Y (mm) Y (mm) Spray Cup Analyses ML Cup RANS Flow Field: Mean Axial Velocity at z = 7mm downstream X (mm) Uz (m/s) X (mm) LDV Measurement [1] Original CFD (RANS) [1] 16

17 Spray Cup Analyses ML Cup LES Flow Field: Time Averaged Axial Velocity at z = 7mm downstream LES Analysis Original Mesh 17

18 Spray Cup Analyses ML Cup LES Flow Field: Time Averaged Axial Velocity at z = 7mm downstream LES Analysis (short time average, run in progress) New Fine Mesh 18

19 Lessons Learned Pro-Engineer CFD Software: CFX Fluent OpenFoam Meshing Turbulence Modeling 19

20 Reference 1. J. Cai, S.-M. Jeng, and E. Steinthorsson, Experimental and Numerical Investigation of a Macro-Laminated Radial Swirler, AIAA 41 st Aerospace Sciences Meeting & Exhibit,