It looks like this is a boring topic, but please be patient after reading it, it's really full of dry goods!
Text/Car Tutu
This article first appeared in the car totem, please indicate the source for reprinting!
So many questions and answerscarAspect of the problem, but there is a problem that has been stumping the car suddenly: the car’sexhaust pipeWhy does it grow on the ass?
Therefore, Che Tutu consulted a friend who is an automotive engineer, and he told Che Tutu: To put it simply-this is because the exhaust system of the car is too long, so it has to extend from the front to the rear.
It turns out that all this is just because it is too long! It’s too long!
The composition of automobile exhaust pipe
With such simple words, how many men and women yearn for? But as a good young man with knowledge, culture, connotation and female votes, how could answer the question be so simple and sloppy?
So, the car suddenly researched the knowledge about the exhaust pipe, and then found that the reason why the exhaust pipe is on the bottom is indeed because of it! very! long! (Isn't this nonsense?)
Don't worry, after reading the following content, you will understand that the car is suddenly abrupt. Let's start with the structure of the exhaust pipe-
The exhaust system is so complicated, what does it contain?
This is because the exhaust system of a car is mainly composed of three sections:Three-way catalytic converterPredominant frontsilencerThe main middle section and the rear section mainly with a rear muffler. The exhaust pipe we often talk about actually refers to the three-way catalytic converter, the front silencer, the rear silencer, and the steel pipe connecting them.
So, what role do they all play?
Exhaust gas from automobile engines contains more harmful substances, so most automobiles nowadays have three-way catalytic converters installed behind the engine. It is the most important external purification device installed in the exhaust system of a car. It can convert harmful gases such as CO, carbon monoxide, HC hydrocarbons, and NOx nitrogen oxides discharged from car exhaust into harmless carbon dioxide through oxidation and reduction. Water and nitrogen. Because this kind of catalytic converter can simultaneously convert the three main harmful substances in the exhaust gas into harmless substances, it is called a three-way catalytic converter.
When the exhaust gas of a car leaves the engine, the pressure is very high, and the noise it produces may make people feel crazy, which can also cause noise pollution. Therefore, a muffler device is needed to eliminate or reduce the noise decibels.
Why is the car exhaust system so long?
One muffler cannot effectively eliminate noise, so two or more mufflers need to be installed to reduce the noise generated by the engine exhaust as much as possible.
It's like a rocket, a multi-stage rocket shoots farther.
In addition, due to the small chassis space of most cars, it is impossible to install all the devices in a certain area. They can only be connected by a steel pipe, extending from the engine at the front of the car to the end, and exhausting from the rear of the car.
Does the exhaust pipe have to be so long that it protrudes from the rear of the car?
Maybe you don’t know, there are also some cars in the world whose exhaust pipes are not on the buttocks.
for example,BenzThe exhaust pipe of a performance sports car like SLR is on the side of the body;
Another example is the exhaust pipe of a large off-road vehicle such as the Mercedes-Benz G500 is also on the side of the body;
Also, for trucks like Optimus Prime, the exhaust pipes are also on the side of the body and go straight to the sky.
This question car suddenly cannot interpret the idea of an automotive engineer intuitively, but it seems a bit close to why a person's chrysanthemum grows on the ass.
Intuitively speaking:
The rear-engined Ferrari exhaust pipe is very short, and the exhaust is fast and smooth, like a fart with a fart, which is cool.
The front-engine Mercedes-Benz SLR exhaust pipe is on the side of the car, like farting sideways, and the sound is deep and powerful.
The front-engine Lexus LS400 exhaust pipe is at the rear of the car, like squatting fart, moisturizing things silently but elegantly.
As for a truck like Optimus Prime, what would it feel like to fix your brain and fart on your stomach?
Common car exhaust pipes protrude backwards from the bottom of the car. Isn’t it like jet airplanes and rockets, the exhaust gas from the engine is sprayed backwards, pushing the airplane forward?
NO! NO! NO!
This almost stumped the car suddenly.
Although the power source of the car is the same as the airplane, it comes from the engine, but the driving force of the car isNotThe reaction force of the engine jetting backwards,ButtireThe reaction force between the rolling resistance to the ground and the ground when rolling.
So why are the exhaust pipes of most cars at the rear of the car body and a few cars have the exhaust pipes on the side of the car body?
This starts with the layout of the body structure and the car engine.
Since the engine of a common car is located in the front of the vehicle, in order to arrange the three-way catalytic converter and the muffler in a limited space, it can only extend from the front to the rear of the vehicle.
Super sports cars such as Ferrari and Lamborghini are all rear-mounted rear-drive models. The engine is originally behind the body, so shorter exhaust pipes are used to protrude from the buttocks.
The Mercedes-Benz SLR is also a super sports car. It uses a front-engine layout. In order to make the exhaust smooth and improve performance, a shorter exhaust pipe is used. Therefore, it does not extend from the rear of the body, but directly extends from the rear of the engine compartment. .
Of course, there is another fatal disadvantage of this layout:too hot.
Of course, there are also great people who have installed jets of super-large chrysanthemums for their cars. The power has reached an astonishing 42,500 horsepower, and the maximum design speed has reached 1,336 km/h.
Didn't you expect that a small car exhaust pipe still has such a big knowledge?
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