Some people say that body mud can save 2 fuels, is it true?

Cars with mud do save fuel, the more mud, the more fuel, at least 10% can be saved, this is not nonsense, nor is it ironic,True from an aerodynamic point of view, this is known as the golf effect.

The main drag of any object, including cars, is wind resistance, which is easily felt. When the car is driving at high speeds, you can feel a noticeable force that sticks your hands vertically out of the car。This force is less than the force you can release.

The hand can also move freely, but it consumes energy during the activity, such as steamed buns.

When the palm of the hand is placed from vertical to flat or compared to seven, a significant decrease in the force is felt, that is, the wind direction changes, while the collision surface decreases at the same time, and the drag decreases。Of course, this shape will consume less energy, perhaps just a slice of bread. The same concept was changed to a car, which is why the wind resistance is rigorously calculated and tested during the design process.

But in order to reduce the wind resistance, the car becomes more and more straight, while the mud car increases the wind resistance. Why is it fuel-efficient?

Applying this concept to cars, the effect of mud coating the car is to constantly change the flow curve of the air to reduce the negative impact of the turbulence zone at the tail, and then change the downforce of the wind resistance, this shape will consume less energy, perhaps just a slice of bread. The same concept has been changed to a car, which is why the wind resistance is rigorously calculated and tested during the design process, and it is possible to convert this force into lift, allowing the vehicle to reduce the load and save fuel while driving, but at the same time, the reduction in tire adhesion can also create potential hazards.

Such a statement is certainly not true. Because if the quality is large, it will cost a lot of oil.

I think it's very likely, on the contrary, that more mud will be more fuel-guzzling.

This argument is actually unworkable, and it is very bad for the body.

And the palm of the hand from vertical to flat or more than seven, you will feel that the force is significantly reduced, which is the change in the direction of the flow of the wind, the impact of the wind surface is reduced and the drag is reduced, and the energy consumed in this shape will naturally be less, maybe just a piece of toast. But the oil sludge itself has weight, if you remove the weight of the oil sludge and consume the amount of gasoline, it really means that it is fuel-efficient. Simple hand, that is, I boxed with you, you let me have one hand, and the two of us were tied, then in fact, you won, the same reason.

After all, this kind of fuel saved will not be too much, in fact, the high fuel consumption of our driving is actually more of our usual operating habits, the same car, why is there a difference between you driving and others driving fuel consumption? So even if you can save fuel, but you don't save much fuel, so why is it more than a car covered with oil sludge compared to the dirty body? In fact, this test is the first to say the "Elf effect".

Why does the surface of the elf ball have to be pitted and bumpy? This is because a ball with a pit on the surface travels farther in the air than a ball with the same surface but a surface.

This is suitable for automobiles, golf balls, trains running on the ground, bullet trains, and other vehicles, as well as airplanes and missiles. Why not on this? The speed greater than 120 per hour is sometimes dominant, and in most working conditions, the rolling resistance of the tire plays a leading role, and the vast majority of the output of the work is used here; Take another 10,000 steps back, the mud affects the rolling resistance coefficient, you have seen the tires on the ground and there has always been mud in the limbs, and it has long been gone!

After being struck, the front of the ball will hit the wind and create a high-pressure area, and the space will be knocked out from the front of the ball in a shape similar to a sonic boom cloud, and then the air will flow through the ball 360° without dead ends, and separate from the ball when it is behind the ball. In addition to the streamlined shape of the body, in addition to the deflector, there is also a concave and convex golf surface. It is true that the wind resistance is small, and it is really fuel-efficient to run at high speed.

It's just weird to look at.

This is all caused by other people's wrong cognition, and many people are willing to listen to others and don't think about problems at all, so no matter how misleading, they all believe it.

When the car is driven to the mud, sometimes you can't get out of the bad side of the brigade, and in this predicament, you can drive the wide car out in 10 minutes. It will only rub in place. That's why there is such a saying about removing rubber.

This is because there are many people who don't call to accompany the car that knows how to guess the chain car, so they will use this method when judging a car, but this way is not scientific at all.

That's because people have a wrong view of these things, which is why they can say such irresponsible things.

The role of the fender is mainly to block the sediment thrown up in the process of forming, and more importantly, to prevent some newly repaired asphalt that has not dried well on the body, because the asphalt is difficult to wash in the usual car wash. The use of fenders can protect the body of your car, reduce muddy splashing in rainy days, reduce the number of car washes, and reduce the damage to the car caused by the crushed stones on the road surface due to the rolling of the wheels.

The purpose of the <> fender is to block the sand and dirt brought up by the wheels during driving, so as to avoid the splashing of sand and gravel and mud to cause damage to the paint of the wheel wings. Protecting the inside of the car Some rear-wheel drive models are on muddy roads or stuck in potholes. The muddy water and small stones brought by the strong power can be driven into the body of the car or the brake discs.

Cause severe wear or malfunction effect, so it is still very effective to have fenders. After all, the cost is not high, as long as there are professional materials.

Reducing muddy splashing in rainy days can reduce the damage to the car caused by the crushed stones on the road due to the rolling of the wheels, and can prevent the mud from splashing to the tie rod and ball head causing premature rust. But it will increase wind resistance and noise. After the fender is installed, it will be about 5 cm more convex than the body, which can protect the body well, reduce the muddy splash in rainy days, and reduce the damage to the car stove due to the rolling of the wheels.

There is phoenix noise, the second is that there is snow where it is easy to hang snow and ice, the third is that it is easy to hang up uneven road sections such as speed bumps and road teeth, don't ask me how I know, it has been hung up a few, if it is often in the afternoon in the south and does not often travel high-speed places can be installed, although the car mud baffle is not very good-looking, but it is very practical. The main function is to prevent the stones from falling out of the tires from hitting the paint surface, damaging the paint surface of the car, and causing damage to the car.

The effect of coating the vehicle with mud is to constantly change the air flow curve to reduce the negative effect of the tail turbulence area, followed by changing the downforce of wind resistance and changing this force into lift force with a probability, so that the vehicle can reduce the load while driving, when Hui Tang will save fuel, but at the same time, the reduction of the adhesion of the old tires in front of the wheel may also cause potential dangers. If there is mud in the body, it will have a golf effect, and theoretically, the dirty body will be more fuel-efficient.

The vehicle is covered with mud, which will constantly change the flow of air, reduce the negative effect of the tail turbulent flow area, and reduce the negative size of the vehicle in the driving mode key, and the tung load will save fuel. This is what people call the golf effect.

There is a popular science TV program in the United States that has done a test specifically for this statement, that is, in a car full of "biabia" full of thick oil sludge, and then to test the fuel consumption of the car, the test results found that the fuel consumption of the car is the same as before the oil sludge was not applied, but the oil sludge itself has weight, and if the amount of gasoline consumed by the weight of the oil sludge is removed, it does mean that it is fuel-efficient. If there is mud in the body, it will have a golf effect, and theoretically, the body will be dirty and more fuel-efficient.

This is because if there is more mud on the car, then he will always maintain a constant temperature, the car is not easy to heat, and it is not easy to emit the Dongkai oil, so if there is more in the car, you can save two fuels.

<> "Nonsensical car knowledge, being covered in mud can save fuel, what is the reason?"

Some car owners do not wash their cars all year round, and the body panels and chassis positions are covered with mud; The mud attached to the body of the car will theoretically increase fuel consumption, because the mud also has mass. To put it bluntly, the body has become heavier and affected the "lightweight fuel saving", but some vehicles are stuck with mud after the fuel consumption has decreased, aside from the impact of the engine, gearbox, transmission system before and after the regular maintenance, as well as the impact of tire pressure and other factors, it is true that some cars have a decline in fuel consumption because of sticky mud, what is the principle?

In fact, if the body is coated with mud and the depression of the "crater" is evenly pressed, the fuel consumption of the vehicle can really be reduced, and the highest standard can be reduced by about 10%! Isn't it an exaggeration......It's just that such a car does get in the way.

What is the maximum running resistance in the driving of a vehicle.

The biggest resistance when driving at high speeds is wind resistance, that is, the resistance of air; Factors such as the density of the air, the wind impact surface of the vehicle, and the speed of the vehicle directly determine the size of the resistance, because the air is covered on the ground without dead angles under the action of gravity, and the moving car must constantly push away the "qualitative and invisible" (invisible but the fact that Sun Socks exist) in order to drive.

The uneven mud can reduce wind resistance, which can be understood to change the direction of the air flow and increase the "lift".

The golf ball effect could explain this phenomenon.

The surface design of a golf ball is potholed, so why not design it for a smooth surface? The reason is that the smooth surface cannot form enough friction with the air, and at the same time, it will be wrapped in the roundness of the airflow; The air impact surface on the front of the sphere will collide and squeeze the air to form a high-pressure area, and the air will form an airflow around the surface of the sphere, and form a turbulent flow (turbulence) at the tail after passing through the sphere. This will cause the flight distance to become shorter and the flight altitude will drop rapidly.

If the surface of the sphere is designed to be uneven but regular, the airflow on the front will be cut, and the airflow around the sphere will also be cut; The point is that the turbulence zone at the tail is reduced, and the degree of counteraction of the turbulence on the inertial force of the sphere will also be reduced, so that the golf ball can fly farther.

Epilogue. Some seemingly bizarre practices have the possibility of saving fuel, but the fuel-saving method of sticky mud on the body is not advisable; Not to mention that the dirty body will be unsightly, and the mud on one leg and one hand will also feel uncomfortable when getting on and off the car, and the point is that it will "affect the cityscape" ......Some dirty vehicles may be punished, and large vehicles must be cleaned before entering the city.

However, the thickness of the varnish is only about 40 microns, and the polishing process is poor, and the varnish can be damaged two or three times; Therefore, it is better to wash the car as soon as possible after off-road or rainy and snowy weather, which is an important way to protect the paint surface.

As for the rubber, it can react with acids and alkalis, the tires are made of rubber, and the body seals are also made of rubber, so it is better not to rely on these muds to save fuel.

<>If it weren't for laziness or lack of time, I don't think anyone would want to make their car look dirty and clean up. But I've seen this saying on the Internet: the dirtier the body, the more fuel-efficient, and it's better to be covered with mud if you don't open it.

The principle is the same as that of a golf ball, which has a pit on the surface and flies farther than a smooth ball. Is that really the case? Not necessarily!

It has been said that the first golf balls had a smooth surface, and later golf players found that balls with scarred surfaces could fly farther. So golf became what it is now. Let's not talk about the authenticity of the story, let's talk about the principle first.

The object will be subjected to air resistance during motion, and the air on the windward side of the object will not have time to be discharged, creating a high-pressure area. The area behind the object does not have time to fill in with air, creating an area of low pressure. There is a pressure difference between the front and back.

The greater the pressure difference, the greater the resistance. A golf ball with a smooth surface is laminar between the airflow and the ball during flight, and the airflow can easily break away from the ball. In the first case in the diagram above, the air flow of the Bicha shirt circulates around the sphere and spreads straight to the sides, so that there is very little air behind the ball.

After the surface of the ball is uneven, the airflow will produce a lot of small vortices when it passes through the sphere, so that the airflow is not easy to separate from the sphere, so that more airflow is added to the back of the ball, the pressure difference between the front and back is reduced, and the resistance becomes smaller. As a result, a golf ball with an uneven surface flies farther than a golf ball with a smooth surface.

But the car is different, and the frontal area of the car accounts for a smaller proportion. In addition, there is a lot of leeway in the design of the car body, which can be reasonably designed to guide the airflow to the rear to fill quickly. And as a qualified golf ball, it must be a serious ball, good guy, no matter which direction you look at it, almost the whole face is a windward side.

This necessitates the addition of pits to properly direct the airflow.

And the car is much larger than a golf ball. This has to consider the problem of air friction resistance. If the car is covered with uneven craters, it will create a lot of irregularly oriented cyclones on the surface of the body, called turbulence.

This increases the frictional resistance experienced by the body. And the golf ball surface is full of pits, so why not be afraid to increase the frictional resistance? This is because the positive effect of increased pits on reduced drag is greater than the negative effect on increased friction after a golf ball increases.

To put it simply, the golf ball is small, and increasing the dimple can reduce the resistance by 20% by reducing the pressure difference between the front and back. But adding a pit increases frictional resistance by 5%. In contrast, the overall resistance has fallen.

Therefore, for objects with a relatively regular shape, if the windward surface is large, sometimes the surface is rough, although it increases the friction resistance, but it can greatly reduce the differential pressure resistance. In the case of automobiles, this theory does not work.