Engine Conversion from Combustion to Compressed Air.
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Transcript of Engine Conversion from Combustion to Compressed Air.
![Page 1: Engine Conversion from Combustion to Compressed Air.](https://reader036.fdocuments.in/reader036/viewer/2022062321/56649ee05503460f94beff3f/html5/thumbnails/1.jpg)
Pressurized Air Vehicle
Engine Conversion from Combustion to Compressed Air
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Ordinary gasoline combustion engine converted to run on compressed air
Drivable, proof-of-concept car◦5-10 minutes◦10-15 mph
Three groups: engine modification, vehicle integration, testing and theory
Project Goals
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Four stroke engine vs. two stroke engine
Golf cart, go-kart, building a chassis, mini Baja
Engine and Chassis Choice
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Chose to modify thetiming by CNC machiningcam lobes.
Norfolk Machine Shop
Engine Modification
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1. Remove Timing Case – 5 bolts
2. Place camshaft – line up timing mark
3. Remove old gasket material, and place new gasket
4. Re-attach Timing Case
5. Check all plugs are sealed
6. Add oil 7. Attach intake
manifold
Engine Assembly
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Engine Troubleshooting Engine running backwards
Intake valve being blown open
Low airflow
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Vehicle Integration
Intake Adapter Tanks Ball valve (Throttle) 5/16” Line Original design too restrictive Met basic flow requirements after post-
install modifications
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Relatively Light Weight Available Locally
(Low Lead Time) Price High Pressure Common Regulator Easy Filling Low Price For Used
Scuba Tank Selection
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Available at ODU motorsports lab.
Consulted with Dr. Ash about use.
Crank shaft was too large so adapter was machined to allow for use with Baja engine.
Dynamometer Testing
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Dyno run #1 0.1 horsepower at 600 rpm
Dyno run #2 0.2 horsepower at 950 rpm
Results
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Using ideal gas assumptions
After manipulation:
Gas Dynamics Thermo Model
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Engine Efficiency
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Comparing EfficienciesInternal
Combustion [1] Hybrid [1] Electric [2] Pressurized AirEngine Efficiency,% 21 30 11
Motor Efficiency, % 79 78
Battery & Battery Charger Efficiency, %
81
Total Efficiency, % 21 24 21 4
Heat Rate, Btu/kWh Efficiency, %
Coal 10444 32.67Petroleum 10826 31.52Natural Gas 8152 41.85Nuclear 10464 32.61
[1] N. D. a. J. Deutch, "Hybrid Cars Now, Fuel Cell Cars Later," Science Magazine, vol. 305, pp. 974-976, August 13, 2004 2004.[2] U. S. D. o. Energy. (2013, April 22). Electric Vehicles (EVs). Available: http://www.fueleconomy.gov/feg/evtech.shtml[3] U. S. E. I. Administration. (April 21). Table 8.1. Average Operating Heat Rate for Selected Energy Sources. Available: http:// www.eia.gov/electricity/annual/html/epa_08_01.html
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Future Improvements•Larger air capacity and flow rate
•Better valve and camshaft design
•Use a more efficient engine type
•Lighter chassis
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https://www.facebook.com/groups/PAVprojectdesign/?hc_location=stream
Completed Engine Conversion
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Gantt Chart
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Questions?