1. Turbine-less Ducted Fan Jet Engine Subsonic Propulsion
Wind Tunnel Team
Long Ly
Garrick Gregory

2. Overview Objective Background Turbine Engine
Turbine-less Ducted Fan Engine
Prototype
CFD Analysis
Wind Tunnel Testing and Validation
Applications
Future Objectives
Questions?

3. Objective
To perform simulation, testing, and validation of a conceptual Turbine-less Ducted Fan Jet Engine design.
Analyze:
Axial Flow Patterns
Pressure Differences
Thrust, Performance, and Efficiency
Design:
Outlet Nozzle

4. Background Conventional Turbine engine Air Inlet Compressor
Combustion Chamber
Turbine
Nozzle
* Images from NASA – Glenn Research Center

5. Turbine-less Ducted Fan Jet Engine
What is a ducted fan?
A fan or compressor installed inside a duct
Why Turbine-less?
No need for a turbine to drive the compressor
Compressor is driven by electric motor
Advantages:
Less fuel consumption
Less expensive
Not difficult to manufacture
Solar panel or fuel cell for electricity
Hydrogen from fuel cell for combustion
Quiet propulsion; suitable for undetected surveillance

6. CAD Model Complete Engine & Wind Tunnel Mounting
Adaptor, Stator, Streamline injector
Wind Tunnel Engine Mount

7. Rapid Prototype Adaptor, Stator, Streamline injector
Complete Engine & Wind Tunnel Mounting
Wind Tunnel Engine Mount
*High grade plastic for quick prototype and aerodynamic testing

8. CFD Analysis Computational Fluid Dynamics
Solidworks /CosmosFloworks
Ansys 12.0 / ICEM / Fluent
Navier Stokes Equations
Finite Volume Method
Navier-Stokes Flow Governing Equations (General / Vector Form)
Continuity Equation:
Momentum Equation:
Internal Energy:

9. Flow Governing Equations (scalar form)
Axisymmetric Flow
Flow Governing Equations (scalar form)
Continuity Equation:
r Momentum Equation:
θ Momentum Equation:
z Momentum Equation:

10. Finite Volume Method Finite Difference Equations
Taylor Series Expansion

11. CFD Progress CosmosFloworks Ansys 12.0 Technical Difficulties
Complex geometry
Software Crash
Overnight Simulations
Ansys 12.0
Ease importing geometry from other CAD Software
Design Modeler – Parametric Solid Modeling
Gambit obsolete
Replaced with ICEM CFD
Mesh creation slightly different
CFD Solver - Fluent

12. Wind Tunnel Testing Static Test Subsonic Wind Tunnel
Single axis force transducer
1 pitot tube, 2 pressure transducers
T-fitting: dynamic & static pressure
LabVIEW Data Acquisition
A Pratt and Whitney turbofan engine for the F-15 Eagle

13. Pressure Pitot Tube Pressure Transducers Bernoulli’s Equation:
Static pressure + dynamic pressure = Stagnation pressure
*Pitot tube image from NASA – Glenn Research Center

14. Power Input Electrical Power Input 2 Digital Multi-meters Voltage
Current
Brushless Motor
Controller
Battery
Receiver
DMM
V (v)
I (A) + + + - + -
Transmitter

15. RPM measurement

16. Photo Sensor Tachometer
Impeller RPMs
Photo Sensor Tachometer
Laser Tachometer
Strobe Tachometer

17. Static Test – Voltage Input

18. Static Test – Power Input

19. Static Test – Exit Velocities

20. Static Test - Thrust
Test 1
Test 2

21. Thrust = F = ṁeVe - ṁiVi + (Pe-Pi)Ae
Nozzle Design Pi ṁi Vi Pe ṁe Ve Ae
Thrust = F = ṁeVe - ṁiVi + (Pe-Pi)Ae

22. Applications High speed UAV’s V/STOL UAV’s
LADF: Lift Augmented Ducted Fan;
combines high speed and VTOL
Bell X-22A
Aero-web.org

23. Future Objectives Complete CFD Analysis Dynamic Wind Tunnel Testing
Design Nozzle
More Testing

24. Thank You Advisors Support Dr. Boussalis Dr. Wu Dr. Guillaume Dr. Pham
Nhan Doan
Solomon Yitagesu
Yacine Sahnoun
Shing Chan
Johanna Lopez
Sara Esparza
Roland Chen

25. ?