What is the effect of various parts of the car on wind resistance?

Let me start by explaining a few reasons for the air resistance of a car. Wind resistance, also known as air resistance, consists of two parts, pressure resistance and frictional resistance. Pressure resistance is divided into shape resistance, interference resistance, internal circulation resistance, and induction resistance.

And what you're talking about is mostly shape resistance. The shape resistance is the main component of the air resistance of the car. The shape resistance is composed of two parts: the windward side and the negative pressure generated by the driving behind the car.

Therefore, reducing the area of the windward side and reducing the negative pressure behind the vehicle are the keys to reducing the air resistance of the vehicle. For example, some concept cars have eliminated the rearview mirror (Volkswagen L1). There is also the overall shape of the body, which is now recognized as a teardrop-shaped body that can effectively reduce air resistance, and the more famous concept car like the logo EX1.

But as far as air resistance is concerned, you can't blindly pursue a low-body Shenma, Mercedes-Benz has launched a bionic concept car, the length of the car is like a fathead fish, but the air resistance is very small, so I still think that the overall shape of the car is the key, and each part can only play a role in optimization. For example, the spokes are made as a whole, such as covering the rear wheels, and reducing the gap from top to bottom when designing the body sheet metal, etc., are all ways to reduce the air resistance of the vehicle. I hope it can help you, I have been thinking about this question for a long time, and I think you should be asking about the relationship between the car body and wind resistance.

In fact, I think that the overall architecture of the car body is streamlined, so it is difficult to talk about the wind resistance relationship of a certain part of the body. Imagine a car cutting through the air like scissors while it is moving, and you will understand that wind resistance is mainly in terms of friction and pressure. <>

The car is not ideal streamlined This is because of the functional needs This is why the air resistance of the car is mostly not because of the smoothness of the surface of the vehicle For the general car, the aerodynamic resistance is mainly the differential pressure resistance The pressure difference caused by the pressure difference between the pressure of the vortex formed by the tail airflow and the front windward pressure This is the main factor Of course, there will be some such as induced resistance and friction resistance are not the main influencing factors and weaken the aerodynamic resistance at the same time It is also necessary to reduce the aerodynamic lift brought by the shape of the car (the formation mechanism of the aerodynamic lift of the car is similar to that of the aircraft wing), then, from the head, the front air dam is to increase the front end downforce, of course, with the front deflector, the airflow is smoother to the rear, the front air vent of the wheel chamber is also to reduce the formation of vortex in the wheel, resulting in pressure differential resistance, the side skirt is to prevent the side from flowing to the bottom, affecting the chassis airflow, rear spoiler. <>

The main factors affecting the wind resistance of the car are as follows: 1. The biggest influencing factor of the wind resistance coefficient of the car is the appearance of the car: smooth streamlined design, reducing the accessories of the body (such as the outdoor reflector, etc.) can effectively reduce the wind resistance coefficient.

2. The design of the bottom of the body will affect the size of the drag coefficient: the reasonable slag layout of the exhaust pipe and other parts, and the flatness of the bottom of the body can effectively reduce the drag coefficient. 3. The design of the grille at the front of the car will also have a certain impact on the drag coefficient

The reasonable design of the air intake grille can not only reduce the drag coefficient, but also be able to return to maintain the air intake normally, and will not affect the cooling of the car engine and brake discs.

Wind resistance is the resistance of the wind. In general, when a vehicle is moving forward, the wind resistance is generally from the front, unless the side wind speed is particularly strong. Otherwise, it will not have much impact on the vehicle, and even if there is, it can be corrected by the steering wheel.

Wind resistance has a significant impact on a car's performance. According to tests, when a sedan travels at 80 km/h, 60% of the fuel consumption is used to overcome wind resistance. What are the factors that affect the wind resistance of the car?

Also listen to my careful analysis.

The drag coefficient cd is a measure of how much a car is affected by air resistance. The smaller the drag coefficient, the less it is affected by air resistance, and vice versa, so the smaller the drag coefficient, the better. Generally speaking, the stronger the flow line, the smaller the drag coefficient.

The drag coefficient can be measured in a wind tunnel. When the vehicle is tested in the wind tunnel, the speed of the car is simulated by the wind speed of the car, and then the test instrument is used to measure how much strength the car needs to resist the wind speed, so that the car will not be blown backwards by the wind. After measuring the required force, and then deducting the friction between the wheel and the ground, the rest is the wind resistance, and then the so-called drag coefficient can be calculated using the aerodynamic formula.

There are three main forces that affect the driving of the car: the power output of the engine, the frictional resistance of the road surface, and the wind resistance. When the car is driving, the amount of wind resistance is related to the drag coefficient and driving speed of the car, and for a car, its drag coefficient is fixed. The drag coefficient of most family cars is about, and the drag coefficient of a streamlined car such as a sports car can be as low, while the drag coefficient of some racing cars can be reached.

Reducing the drag coefficient can improve the fuel economy of the car, so how to reduce the drag coefficient of the car?

The biggest influencing factor of a car's drag coefficient is the exterior styling of the car. The smooth streamlined design and the reduction of the body accessories (such as the outdoor reflector) can effectively reduce the drag coefficient.

The wide wheels and the deep arc space of the part where the wheels are installed will increase the drag coefficient of the car, so in the design and manufacture of the car, we cannot blindly pursue wide tires, and the space for wheel installation should not be too wide.

The design of the underbody affects the magnitude of the drag coefficient. The reasonable layout of the exhaust pipe and other components, and the flatness of the bottom of the body, can effectively reduce the drag coefficient.

The design of the grille at the front of the car will also have a certain impact on the drag coefficient. Reasonable grille design can not only reduce the drag coefficient, but also maintain the air intake normally, and will not affect the cooling of the car engine and brake discs. (Photo by photo:.)

Zou Ting1) @2019

The ways to reduce the wind resistance of the car are: 1. Flat chassis: A flat chassis can not only reduce the resistance of air flow through it, but also reduce the lift generated by turbulence.

The ideal chassis consists of a complete lightweight chassis armor, but it is generally not cost-effective from a cost point of view. Electric vehicles do not have an exhaust system, so the chassis design itself is relatively flat, and then through a reasonable part layout crack ruler, you can generally obtain better aerodynamic performance. 2. Make full use of the ground effect

The ground effect is to use the baffle around the body to divert the airflow from the bottom of the car to both sides of the body, and at the same time reduce the airflow on both sides into the bottom of the vehicle, so that a lower air pressure area is generated between the car and the ground, and finally form a pressure difference between the body and the bottom of the car, resulting in additional downforce, so as to enhance the grip of the tire, reduce the rolling friction of the tire, and improve the energy economy. 3. Various airflow guidance devices: In places where the angle of the vehicle body changes by more than 12 degrees (such as the rear of the car), the use of tail wing stuffy width, diffuser and other diversion devices can improve the aerodynamic performance of the vehicle.

Their general principle is to direct the airflow through the body more smoothly and prevent turbulence around the body. 4. Closed wheels: Friends who often watch F1 are certainly no strangers to this, in fact, this design has existed for a long time, but it has been rarely used in traditional car design, the reason is that closed wheels will greatly affect the heat dissipation performance of the brake system.

Due to the action of air in the driving of the car, the aerodynamic force in three directions such as longitudinal, lateral and vertical is generated around the center of gravity of the car at the same time, which will have different effects on the high-speed car, among which the longitudinal aerodynamic force is the largest, accounting for more than 80% of the overall air force, therefore, the component of the air force in the driving direction when the car is driving in a straight line is called air resistance.

Wind resistance is the resistance from the air when the vehicle is driving, and there are generally three forms of air resistance: Qi Hall.

The first is the drag caused by the air flow hitting the front of the vehicle, which is like taking a wooden plank against the wind, and the resistance is almost all the resistance caused by the air flow.

The second is frictional resistance, which produces the same frictional force as air passing through the body, but at the fastest speed of the general vehicle with high ceiling hidden energy, the frictional resistance is so small that it is almost negligible.

The third is the external resistance, generally speaking, when the vehicle is driving at high speed, the external resistance is the most important air resistance**. The resistance caused by the appearance comes from the vacuum zone behind the car, and the larger the vacuum zone, the greater the resistance. Generally speaking, a sedan has less external resistance than a hatchback.

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1.Use a flat chassis. Using a flat chassis reduces turbulent lift and wind resistance.

2.Device guides. Wind resistance can reduce the flow of air on both sides by installing a posture baffle or spoiler at the appropriate location of the vehicle.

3.Install the tail and diffuser. At the rear of the car, we can install rear wings, diffusers and other deflectors, so that the steering airflow will be smoother when passing through the body.

4.Use closed wheels. Closed wheels can reduce wind resistance, but affect the heat dissipation performance of the braking system.

5.Lower the chassis. Lowering the chassis of a car reduces the lift generated by turbulence and wind resistance.

6.Reduces side protrusion. Make a hidden door handle, so that the handle of the car can be integrated with the body, which shot to reduce the side protrusions, which helps to reduce wind resistance.

7.Reduce the speed. If you reduce your driving speed, your wind resistance will also decrease.

Wind resistance is the air resistance experienced by the car during driving, and the wind resistance coefficient is the magnitude of the air resistance.

Wind resistance affects the performance of a car. The greater the wind resistance, the greater the air resistance of the car, and the higher the fuel consumption of the car.

When designing a car, it is possible to reduce the protruding body attachments, and the wind resistance can be effectively reduced through the appropriate arc transition of each part. Millions of car purchase subsidies.

What is the drag coefficient on the parameters of the car? What is the impact on the car? You can see it at a glance.

The most simple and easy-to-understand, the most intuitive impact is fuel consumption, the wind resistance coefficient is large, the resistance of the car is large, and the car needs more power, so it is more fuel-intensive, just like a person running against the wind!

Then there is to increase the wind noise, the wind blows on the car body, there will be noise.

There is also a decrease in the stability of the vehicle, because the size and direction of the wind will affect the balance of the vehicle.

The drag coefficient refers to the impact of the wind resistance on the driving of the car when the car is driving, the size of the drag coefficient has a great impact on a car, and the smaller the drag coefficient, the lower the fuel consumption of the car may be.

Air resistance is the largest and most important force encountered by a car while driving. The air resistance coefficient, also known as the drag coefficient, is an important factor for calculating the air resistance of a car, which is determined by wind tunnel experiments and glide experiments. The magnitude of the drag coefficient depends on the shape of the car, the higher the drag coefficient, the greater the air resistance.

At present, the drag coefficient of automobiles is generally in between.