martin buchan pmw2014 - tuning akademie · private vln team vln class d3t/at from ingolstadt...
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Martin Buchan PMW2014
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Who we are
Race cars in summer 2013
Methods to verify aerodynamic performance
◦ Cotton threads
◦ Flow visualisation paint
◦ Data logging
◦ Laser sensor
Simulation knowledge
Future RS5
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Private VLN Team
VLN class D3T/AT
From Ingolstadt
Founded in 2007
Members: Audi Employees from Ingolstadt
Philosophy:
Using knowledge of different departments of AUDI AG Ingolstadt. Scientific development on the racetrack
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Cotton Threads
Data Logging
Flow-Viz-Paint
Laser Sensors
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- Simple - Cheap - Camera or photographer to watch - Good colour: neon pink - Difficult in rainy conditions
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2013
2014
Changes: - Larger flaps - Smaller angle - Smooth surfaces
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No separation at brake cooling inlet
Outlet becomes inlet
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outlet interior
new outlet interior
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petroleum + chalk particles = flow visualisation paint
- Cheap - Easy to produce - Should dry while driving - Not working on hot surfaces - Using brush or spray
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Separation at leading edge
Separation behind screw
Separation
Outlet becomes inlet
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Separation
Vortex
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Airflow to the outside
Vortex caused by different pressure areas
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Separation at the lower side Full length: 330mm Separation: from 278mm (16%, should be <=5%)
Longer Endplate to improve performance
Separation at the edge
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Separation caused by fold
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Important data for aerodynamics: - Vehicle speed - Water temperature - Charged air temperature - Laser sensors
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Front Rear
- Measurement of ride height at front and rear - Comparison of standstill and highspeed - Calculation of downforce - Identified bad downforce balance
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Source: Rennwagentechnik, Michael Trzesniowski, Springer Vieweg 2012
front wing
rear wing
undertray
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Wing in free air stream Wing close to ground - Little increase in cd - cl more than doubled
Source: www.runxbuys.com
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-Covered rear axle for more _downforce and less drag
-Less cooling for rear differential
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- Rear axle covered - NACA ducts for rear differential - Maximum size diffusor with 4 _ diffusor fins
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- Smaller rear wing for less drag _and better downforce balance
2013
2014
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- Expanding outlet area from 600cm² _to 2800cm² - Additional 20mm gurney for more _downforce and cooling performance
2013
2014
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Inlet interior
New position
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- Expanding to maximum size of __200mm - Possebility to use bigger flaps
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Brake cooling
Engine cooling Brake cooling
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- Different temperature areas - Better cooling performance - Less drag - Lower air temperature (engine)
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Driving direction Outlet for less drag
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…after 4800km racing Comparison summer 2013 vs. summer 2014 - Topspeed +10km/h - Downforce +11% - Coolant temperature -10K - Improved downforce balance
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- Audi RS5 body - 3.0 V6 TDI BiTurbo - 400hp - 800Nm - quattro
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