Presentation on delta wing
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This document discusses Mahesh Patil's thermal science research project which involves analyzing the flow over a delta wing using computational fluid dynamics (CFD). The project has two phases: a literature review phase involving five research papers on vortex breakdown and control over delta wings, and a CFD analysis phase. The research papers investigate vortex breakdown using experiments, Reynolds-averaged Navier-Stokes equations with different turbulence models, and particle image velocimetry (PIV) to analyze flow structures. The CFD analysis will evaluate the thermal performance of an automobile radiator with a delta wing configuration.
Presentation on delta wing
- 1. Mahesh Patil M130379ME Thermal Science
- 2. Phase I ï‚žIntroduction ï‚žResearch papers Phase II ï‚žCFD analysis
- 3. Research Paper 1  Progress in Aerospace Sciences 37 (2001) 385– 418  Anthony M. Mitchell, Jean Delery  Vortex breakdown detrimental or beneficial effects, depending on the application.  Diverse control methods developed  Still a superior efficiency or effectiveness in controlling either the vertical flow structure or the vortex breakdown location? – not fully understood
- 4.  In a water tunnel over a slender delta wing as a result of the emission of colored dye near the apex  The control and exact location vortex breakdown- requires basic understanding and physics of the phenomenon  Techniques- mechanical, pneumatic  Major obstacles in vortex breakdown implementation in new generation aircrafts like delta winged.
- 5. Research Paper 2 ï‚ž The numerical simulation of the flow around a 65â—¦ delta wing configuration with rounded leading edges is presented ï‚ž Numerical solutions: RANS ( Reynolds-Averaged Navier-Stoke eqs.) using different turbulent models ï‚ž How flow topology depends on angle of attack and Reynolds no.
- 6. Wilcox k-w model (k-w) Spalart Allmaras model (SA) CFD simulations around a 65◦ delta wing with rounded leading edges and angle of attack α = 13.3◦ carried out inner vortex is generated out of a vorticity layer moving downstream inner vortex occurs before the outer vortex is generated
- 8. Research Paper 3 Azize Akcayoglu (2011) Experimental study of flow structure in horizontal equilateral triangular ducts having double rows of half delta-wing type vortex generators mounted on the duct’s slant surfaces Flow field measurements using PIV (particle image velocimetry)
- 9. ï‚žCFU & CFD ( common flow up & common flow down ) ï‚žContradictory results in earlier litterature ï‚žSo verified through experiment
- 10. ï‚žReynolds no. varied from 1000 to 8000 ï‚žDuct 1 : pair of CFU (common flow up) ï‚žDuct 2: CFU + CFD ï‚žMotivation: which duct gives larger vortex formation ï‚žResult: duct 2 gives larger vortex formation & greater induced vorticity
- 11. Research Paper 4 ï‚ž A. Joardar, A.M. Jacobi (2005) ï‚ž Experimentally verified the effectiveness of delta wing type vortex generators using full scale wind tunnel ï‚ž Compact heat exchanger is used (eg. Automobile radiator)
- 12. ï‚žAverage heat transfer enhancement by 21% ï‚žPressure drop penalty of 6%
- 13. Reseach Paper 5 Russell M. Cummings, Andreas Schütte (2013)  International VFE (vortex flow experiment) Numerical solution within for VFE-2 delta wing with rounded leading edge  Simulation software: Cobalt Navier-Stoke solver SA, SARC, DES, DDES
- 14. ï‚ž CFD calculation with the unstructured Cobalt code are presented ï‚ž Used various turbulent models and compared with experimental data available (surface pressure, PIV) ï‚ž RANS simulation results close to experimental results than DES, DDES.
- 15. ï‚žCFD analysis of flow over delta wing to evaluate the thermal performance of automboile radiator