Презентация на тему Power Requirements of A Vehicle

vehicle in km/h is:

rwheel = Wheel Rolling Radius (meters)
Ideal

capacity of Powering Engine:

Cycle Work to be done by an Engine Directly Powering the Vehicle

Ideal cycle work of A Powering Engine:

the resisting forces to motion are comprised of :
Acceleration

forces (Faccel = ma & Iα forces)
Aerodynamic loads (Faero)
Gradeability requirements (Fgrade)
Chassis losses (Froll resist ).

of:
Turbulent air flow around vehicle body (85%)
Friction of air

over vehicle body (12%)
Vehicle component resistance, from radiators and air vents (3%)

≈ 1.2 kg/m3
A = projected frontal area (m2)
f(Re) =

Reynolds number
v = vehicle velocity (m/sec)
V0 = head wind velocity

a drag coefficient of between 0.30 and 0.35.
SUVs,

with their flatter shapes, typically achieve a Cd of 0.35–0.45.
Notably, certain cars can achieve figures of 0.25-0.30, although sometimes designers deliberately increase drag in order to reduce lift.
0.7 to 1.1 - typical values for a Formula 1 car (downforce settings change for each circuit)
0.7 - Caterham Seven
at least 0.6 - a typical truck
0.57 - Hummer H2, 2003
0.51 - Citroën 2CV
over 0.5 - Dodge Viper
0.44 - Toyota Truck, 1990-1995

Spitfire Mk IV, 1971-1980
0.42 - Plymouth Duster, 1994

0.39 - Dodge Durango, 2004
0.39 - Triumph Spitfire, 1964-1970
0.38 - Volkswagen Beetle
0.38 - Mazda Miata, 1989
0.374 - Ford Capri Mk III, 1978-1986
0.372 - Ferrari F50, 1996
0.36 - Eagle Talon, mid-1990s
0.36 - Citroën DS, 1955
0.36 - Ferrari Testarossa, 1986
0.36 - Opel GT, 1969
0.36 - Honda Civic, 2001
0.36 - Citroën CX, 1974 (the car was named after the term for drag coefficient)
0.355 - NSU Ro 80, 1967

F40, 1987
0.34 - Chevrolet Caprice, 1994-1996
0.34 -

Chevrolet Corvette Z06, 2006
0.338 - Chevrolet Camaro, 1995
0.33 - Dodge Charger, 2006
0.33 - Audi A3, 2006
0.33 - Subaru Impreza WRX STi, 2004
0.33 - Mazda RX-7 FC3C, 1987-91
0.33 - Citroen SM, 1970
0.32064 - Volkswagen GTI Mk V, 2006 (0.3216 with ground effects)
0.32 - Toyota Celica,1995-2005
0.31 - Citroën AX, 1986
0.31 - Citroën GS, 1970
0.31 - Eagle Vision
0.31 - Ford Falcon, 1995-1998
0.31 - Mazda RX-7 FC3S, 1986-91
0.31 - Renault 25, 1984
0.31 - Saab Sonett III, 1970
0.30 - Audi 100, 1983
0.30 - BMW E90, 2006
0.30 - Porsche 996, 1997
0.30 - Saab 92, 1947