What is the use of a car turbocharger liner
The main role of the automotive turbocharger is to increase the intake of the engine, thereby increasing the output power and torque of the engine, so that the vehicle gets more power . Specifically, the turbocharger uses the exhaust gas energy from the engine to drive the compressor, and compresses the air into the intake pipe, increasing the intake density, enabling the engine to burn more fuel, thereby increasing the power output .
How a turbocharger works
Turbocharger is mainly composed of two parts: turbine and compressor. When the engine is working, exhaust gas is expelled through the exhaust pipe, pushing the turbine to spin. The rotation of the turbine drives the compressor and compresses the air into the intake pipe, thereby increasing the intake pressure and improving the combustion efficiency and power output .
Advantages and disadvantages of turbochargers
Advantages :
Increased power output : Turbochargers are able to increase the intake of air, allowing the engine to produce more power and torque for the same displacement .
Improved fuel economy : Engines with turbocharged burn better, typically saving 3%-5% of fuel, and have high reliability, good matching characteristics and transient response .
adapt to high altitude : turbocharger can make the engine maintain high power output at high altitude, to solve the problem of thin oxygen at high altitude .
Disadvantages :
Turbine hysteresis : due to the inertia of the turbine and intermediate bearing, when the exhaust gas suddenly increases, the turbine speed will not increase immediately, resulting in power output hysteresis .
low speed effect is not good : in the case of low speed or traffic jam, the effect of turbocharger is not obvious, even better than the naturally aspirated engine .
Automotive turbochargers are made of different materials such as wheels, bearings, shells and impellers . Wheels are usually made of superalloy materials, such as Inconel, Waspaloy, etc., to meet the requirements of high temperature and pressure .
Bearings are often made of cermet and other materials to improve wear and corrosion resistance .
For the shell part, the compressor shell is mostly aluminum alloy or magnesium alloy to reduce weight and improve efficiency, while the turbine shell is mostly cast steel .
The impeller and shaft are mainly made of steel, especially the compressor impeller often uses superalloy, which has excellent high temperature oxidation resistance, strength and corrosion resistance .
Materials of different parts and their functions
wheel hub : the use of high-temperature alloy materials, such as Inconel, Waspaloy, etc., to meet the requirements of high temperature and pressure .
bearing : usually used metal ceramic and other materials to improve wear and corrosion resistance .
shell :
compressor shell : mostly aluminum alloy or magnesium alloy, to reduce weight and improve efficiency .
turbine shell : mostly cast steel material .
impellers and shafts : mostly steel, especially compressor impellers often use superalloy, this alloy has excellent high temperature oxidation resistance, strength and corrosion resistance .
Influencing factors of material selection
The selection of turbocharger materials mainly considers the following factors:
High temperature and high pressure : the internal temperature and pressure of the turbocharger are high, and it is necessary to choose materials with good high temperature and high pressure resistance .
wear resistance : the stressed parts need to have a certain wear resistance to improve the service life .
mechanical properties : materials need to have sufficient strength and toughness to meet the needs of high-speed operation .
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