drag coefficient: air resistance is the largest and most important external forces encountered when the vehicle is traveling. Air resistance coefficient, known as the drag coefficient is a significant coefficient calculation automobile air resistance. It is a mathematical parameter determined by wind tunnel tests and glide experiments, it can calculate the air resistance when the car is traveling. Drag coefficient depends on the size of shape of the car. Greater drag coefficient, the greater the air resistance. Hyundai drag coefficient is typically between 0.3-0.5. .
noun 1 drag coefficient interpretation
drag coefficient: air resistance is the largest and most important external forces encountered when the vehicle is traveling. Air resistance coefficient, known as the drag coefficient is a significant coefficient calculation automobile air resistance. It is a mathematical parameter determined by wind tunnel tests and glide experiments, it can calculate the air resistance when the car is traveling. Drag coefficient depends on the size of shape of the car. Greater drag coefficient, the greater the air resistance. Hyundai drag coefficient is typically between 0.3-0.5.
2 reason drag formation
from the drag resistance of the air when the vehicle is running, air resistance generally has three forms a first resistance to gas flow is generated in the vehicle frontal collision, take a piece of wood as the wind the line, the resistance experienced by almost all the impact resistance generated by the airflow. The second is the friction, air and across the body will produce the same friction, however, with the fastest speed of the vehicle can travel in general, the friction is small to negligible. The third is the shape resistance, in general, high-speed driving, the appearance of resistance is the main source of air resistance. Exo vacuum zone created by the resistance from the rear of the vehicle, the greater the vacuum zone, the greater the resistance. In general, good resistance RV of San Xiangshi will be smaller than the hatchback SUV.
3. Common windage
● vertical plane body drag coefficient of about 1.0
● spheres drag coefficient of about 0.5
● general car drag coefficient of 0.28-0.4
● better in sports car 0.25
● car can reach 0.15
● birds 0.1-0.2 [ 123]
● aircraft reaches 0.08
● current drag coefficient raindrops minimum of about 0.05
4. windage vehicle
windage from the air when the vehicle is traveling resistance, air resistance generally has three forms:
the first gas stream is generated in the vehicle frontal impact resistance, take a piece of wood as the line wind, the air flow resistance experienced by almost all the impact resistance generated.
The second frictional resistance, across the vehicle body as the air and produces a frictional force, however, is generally the fastest speed of the vehicle can travel, the small frictional resistance is almost negligible.
The third shape is a resistance, in general, high-speed driving, the appearance of resistance is the main source of air resistance. Exo vacuum zone created by the resistance from the rear of the vehicle, the greater the vacuum zone, the greater the resistance. Generally, resistance RV of San Xiangshi appearance will be lower hatchback RV
5. Measurement of the drag coefficient
the drag coefficient can be measured by the wind tunnel. When the vehicle is tested in a wind tunnel by the vehicle speed at the wind speed to simulate the cars, and then to test equipment to measure how much force needs to know the car took to resist the wind speed, the car will not retreat in the wind. After the measured force required, after deducting the wheel friction with the ground, the rest is a drag, then a so-called drag coefficient of a formula can be calculated from the aerodynamic.
= drag coefficient of a front wind resistance × 2 ÷ (density of air x x front of the front projection area of the vehicle speed squared).
drag coefficient
car is fixed, the vehicle suffered the resistance at various speeds can be calculated in accordance with the drag coefficient.
6. Relationship drag coefficient and vehicle performance
the vehicle is traveling, to be overcome resistance of the organic member loss resistance, rolling resistance of tires produced (generally referred to as road resistance) and the air resistance. With increasing vehicle speed, the air resistance is becoming the main traveling resistance, when the speed of 200km / h or more, the air resistance accounts for almost 85 percent of all of the traveling resistance.
Usually the vehicle is forward, the wind resistance by substantiallyFrom the front, side wind speed unless particularly large. Or will not have much impact on the vehicle, even if it has, it can be corrected by the steering wheel. Effects of drag on the performance of the car is very large. Drag coefficient is smaller, it is subject to the influence of air resistance, and vice versa, therefore the drag coefficient as small as possible. Generally, the stronger the linear flow cars, smaller drag coefficient. Currently, the most drag coefficient cars we see on the road in between 0.28-0.4; linear better car as a sports car, with its drag coefficient of up to about 0.25, and even some of the car can reach about 0.15.