Thesis Seminar DAVID S. MARTIN 3/2/2017

Transcription

1 Thesis Seminar DAVID S. MARTIN 3/2/2017

2 Presentation Overview I. Background II. Previous Work III. Project Goals IV. Project Workflow V. Work So Far VI. Remaining Tasks VII. Future Studies CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 2

3 Background To date, studies of winglet design have not accurately replicated avian wingtip geometry pelican wings, for example Studies detailing the effectiveness of distributed, cascading winglets at reducing drag typically have yielded mixed results using highly simplified geometries Still from video footage provided by the BBC CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 3

4 Previous Work Studies to determine drag reduction of a single vortex vs. smaller distributed vortices created at the wing tip have generally been inconclusive or contradictory Minimal biomimicry present CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 4

5 Example - Coiro et al. Series of studies performed by Coiro, Nicolosi, Scherillo and Maisto (2007, 2008) CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 5

6 Project Goals 1. Use 3D scanning and 3D printing technologies to develop a process to create a biologically accurate aerodynamic test model of a Brown Pelican wing 2. Fabricate a wind tunnel test model to validate the model creation process 3. Characterize sections of a 3D scanned pelican wing and compare to previous studies 4. Perform wind tunnel testing using Cal Poly s low speed wind tunnel Smoke and laser visualization Pressure measurement CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 6

7 (e) Wing grid Nazarinia et al. Coiro et al. CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 7

8 Project Workflow Obtain 3D Scan Data Import 3D Scan Data Into CAD and Refine 3D Print Models and Improve Surface Finish Perform Wind Tunnel Testing Analyze and Compile Data CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 8

9 Work So Far - 3D Scanning 3D scans of: Pelican primary feather Santa Barbara Museum of Natural History Pelican wing Los Angeles Natural History Museum CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 9

10 CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 10

11 MATLAB MATLAB code developed to create sections from raw point cloud 3D scan data CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 11

12 3D Modeling MATLAB sections used to recreate simplified wing and feather shapes from scratch CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 12

13 CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 13

14 CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 14

15 Airfoil Characterization Brown Pelican (Pelecanus occidentalis), left wing Section 1 (proximal) Section 9 Section 3 Section 11 Section 5 Section 13 Section 7 Section 15 (distal) CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 15

16 3D Printing Initial small-scale prototype created to troubleshoot the preliminary model creation process CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 16

17 Lessons Learned ABS was not suited to this application, new material required Surface finishing techniques needed refinement Smoke machine output was inconsistent 1:1 scaling not currently possible with available technology CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 17

18 Final Test Model CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 18

19 CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 19

20 Remaining Tasks Finish airfoil characterization and comparison Continue wind tunnel testing: o Smoke and laser visualization o Pressure rake o Investigate feather deflection CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 20

21 Future Studies Establishing a process to create biologically accurate wing models opens the door to numerous possibilities: o Different primary feather configurations o Different surface textures o Other birds (California Condor, Australian Pelican, Turkey Vulture) California Condor (Gymnogyps californianus) CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 21

22 CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 22

23 References Slide 1: Graham Doig, Slide 3: Slide 4: Slide 5: Coiro, Nicolosi, Scherillo, Maisto, Single Versus Multiple Winglets: Numerical and Experimental Investigation, ICAS 2008, 26 th International Congress of the Aeronautical Sciences. Slide 7: Coiro, Nicolosi, Scherillo, Maisto, Single Versus Multiple Winglets: Numerical and Experimental Investigation, ICAS 2008, 26 th International Congress of the Aeronautical Sciences. Nazarinia, Soltani, Ghorbanian, Experimental Study of Vortex Shapes Behind a Wing Equipped With Different Winglets, JAST 2006, Vol. 3 No. 1, pp Slide 21: Slide 22: CALIFORNIA POLYTECHNIC STATE UNIVERSITY - DAVID S. MARTIN 23