Lab 07: System Analysis 3 (Wind Tunnel Testing) Advanced Energy Vehicle

Piaggio Avanti! Fun Fact: The P.180 Piaggio Avanti’s wings, canard and propeller were designed and tested at The Ohio State University helping make this plane one of the world’s most efficiency propeller driven planes in the world! These tests were similar to the ones that will be conducted in today’s lab!

AEV Project Objective (Problem Definition) INITIAL CONCEPTS (Brainstorming) EXPERIMENTAL RESEARCH ANALYZE DESIGN DECISION RESEARCH COMPARE FINAL DESIGN Present AEV Design PT 1 PT 2 PT 3 PT 4 (System Analysis) (Programming)

Lab Objectives/Goals  The objectives of this lab are: Become familiar with propulsion system efficiency Become familiar with wind tunnel testing equipment  How to relate AEV to real-life objects  How to link wind tunnel testing to the AEV

Propulsion Efficiency

Power

Units  Output Power is a Mechanical System Typical Units are: ??? Hint: when you ask for a car’s power is it given in units of … ??  Input Power is an Electrical System Typical Units are: ??? Hint: when you look up your light bulb’s power, it is given in units of … ?? Answer: Horsepower Answer: Watts  Watts does NOT equal horsepower so the need to convert horsepower to watts using the AEV Lab Manual

Advance Ratio

How does this relate to AEV?  Looking at a plot of Propulsion Efficiency vs Advance Ratio Increasing Voltage

How does this relate to AEV?  Looking at a plot of Propulsion Efficiency vs Advance Ratio  Where is the 2 volts A or B?  2 volts divided by a 7.4 volt battery is approximately equivalent to 27% MotorSpeed A B

Configuration Selection Puller (Tractor) Configuration Pusher Configuration  Looking back at Piaggio Avanti back on the second slide, what is its configuration? Answer: Pusher!  Also look at the affect of the two sides of the propeller, there is a right and wrong way to put on a propeller! Thrust Line

Quick Introduction on Setup Power Supply Velocity Speed Indicator Thrust Stand Data Acquisition Arduino Control System Wind Tunnel Speed Control

Questions to think about...  Things to think about during the Lab: How do the values you obtain for power available of the AEV’s motors compare to a typical car? Are the values reasonable? How do the values you obtain for input power of the AEV compare to a household light bulb? Are the values reasonable? What is the advance ratio needed to obtain the highest efficiency and how does that relate to power needed? Do all propellers have the same performance for all voltages/configurations?

Questions?