Friends who like self-priming don't have to worry. The conclusion just mentioned is based on household use and small displacement. If the power level is similar, why don't small-displacement turbocars be better than large-displacement self-priming?
There is a paper in the journal of Mechanical Science and Technology. In the numerical analysis of turbo-charging hysteresis effect based on AMESim, it is mentioned that the greater the inertia and A/R value of the turbine, the more obvious the turbo-charging hysteresis phenomenon is. If you want to use a turbine to squeeze a small-displacement engine out of a large-displacement engine, you need a turbine to generate higher supercharging pressure. The greater the turbine inertia and A/R value, the more obvious the lag. To put it simply: the more power is pressed, the more obvious the turbine lag is. For example, the farther you want to jump, the longer the run-up distance. Compared with large displacement self-priming, small displacement turbine can squeeze out almost the same power, but the lag is more obvious, so it is not as good as self-priming.
The displacement is similar, and the turbine power is strong.
But now there are mainly small-displacement cars on the market. According to the statistical data given by China Automobile Industry Association in 20 18, passenger cars with small displacement below 1.6L account for 66.4% of the total passenger car sales, less than 70%, and all of them are small displacement.
For small displacement vehicles, the power advantage of turbocharging is quite obvious. There is a paper in Automobile Engine magazine, which mentioned the present situation and market forecast of automobile engine supercharging technology.
As early as 1923, the turbocharger produced by Swiss ABB company can increase the engine power by 40%. 1923! Today's more advanced turbines are even much larger than this figure. The turbine is a bit like a stimulant can of an engine. For small displacement vehicles, the power output of turbocharging is not as linear as that of natural inhalation, but at least there is power. If you step on the accelerator, the engine can respond positively.
In contrast, the natural inspiratory power of small displacement is too weak, and the output is linear and stable. As soon as you step on the accelerator, the energy that the engine can explode is so much and limited, right? What's this feeling? You are hungry, and there are two cakes in front of you: one is very big and can fill your stomach, but it tastes ordinary; The other piece tastes quite good, but it's only this small.
Stronger power means that turbo cars are easier to drive than self-priming cars when they need to accelerate and overtake in daily life.
As I said in the video before, if you want to have a high overtaking success rate in urban areas and ensure safety and comfort, you need to accelerate more than 0.3G The translation is: the acceleration from 0 to 100km/h should be within 9.45s Take Yinglang, which sells well, as an example: naturally aspirated engine models accelerate from 0 to 100km/h,/kloc- The throttle pedal will be turbocharged. Although the displacement is smaller, the acceleration from 0 to 100km/h can reach 9.85s, which is closer to the figure we just calculated, and it will be easier to drive when overtaking.
The shortcomings of turbo cars are covered up by technical means.
Moreover, some faults of the turbine have been solved a lot now, and the experience will not be worse than that of natural inhalation, as if it were day by day, in the clouds and fog. Nowadays, the lag of turbines is very small, for example, the lag of turbo cars is very small, mainly because of the use of new technologies. More common: small inertia turbine, to put it bluntly, makes the turbine smaller and lighter, and is more easily driven by exhaust gas.
Just like blowing a paper windmill, it turns with a whoosh. An iron windmill, you whimper, but it turns slowly. Isn't it just a little dull? So, if you want to relax and slow down, change the iron ones into paper ones and the big ones into small ones.
Hunan University has a paper "Vehicle Fuel Economy Performance Improvement and Experimental Research", which says: Small inertia supercharger, small turbine rotor size and small moment of inertia can effectively improve low-speed responsiveness. Some more advanced turbochargers even adopt new technologies such as variable cross-section technology and electronic turbine technology, and cooperate with small inertia turbines to solve the turbine lag problem.
Some luxury brands, such as Ferrari and Audi, can even reduce the turbine response time to a few tenths of a second. This is about the same as the blink of an eye. It's not that an old driver doesn't feel much different from natural inhalation at all.
Life is long, too
In recent years, the application of various new materials has greatly improved the reliability of turbines, which is no longer the impression of old drivers and friends: 50,000 kilometers to be repaired and 65,438+100,000 kilometers to be replaced. There is a paper in Casting Technology magazine, which mentioned the present situation of casting alloy and production technology of turbocharger shell. Now some manufacturers have replaced gray cast iron and ordinary ductile iron with new materials such as heat-resistant stainless steel and high-nickel austenitic ductile iron.
The life of turbocharger housing is greatly improved. Toys, for example, used to be made of plastic, but now they are more resistant to playing with alloys. Even if it is not resistant to hitting, it is more resistant to falling, right?
Turbo cars have great potential.
Finally, the potential of turbo cars is far greater than self-priming, and only a relatively simple upgrade is needed to gain more powerful power and improve the driving experience. There is a paper in the Journal of Agricultural Machinery, which mentioned the method of measuring the charging efficiency of gasoline engines according to fuel consumption and air-fuel ratio.
The inflation efficiency of an engine directly affects its power and torque, which are important indicators to measure the engine power. Inflating efficiency refers to the ratio of the air volume flow of the intake pipe to the air volume flow discharged by the piston during the intake stroke.
Don't remember, the higher the inflation efficiency, the more air the engine "er" inhales at a time, and the stronger the power. The longer you can hold it, the longer you stay in the water, and the worse you feel anyway. Turbocharged cars only need to brush the computer to improve the turbocharging value within the range that the engine body material can bear. It can greatly improve the air inhaled by the engine every time to improve the inflation efficiency, and the power will come up.
If the self-priming engine wants to increase power, it will be more complicated and the effect will not be so obvious. Of course, the family car does not allow us to upgrade the power system, but on the court, turbocharging has gradually replaced the naturally aspirated engine and become a better choice.
Turbocharged cars recommend small household displacement.
Generally speaking, due to the development of family cars to small displacement, turbocharged cars are indeed more advantageous and easier to drive than self-priming cars. If it is for home use, with small displacement, it is recommended to use a turbo car now.
What is the displacement of the family car?
What is the displacement and power of buying a car at home? What is "small displacement"? People often say, "How many seconds does it take to accelerate from 0 to 100km/h/h"? How many seconds is fast? How many seconds is enough? How many seconds do you think, "Oh, my God"? This power is a bit poor. I sorted out the information for you, found the paper and made a small form.