The final pressure of air after supercharging is 1.5 – 2 times the pressure of entry air. Thus, the temperature of supercharging air is much higher than the atmospheric temperature and this causes the knocking in the petrol engine. At higher altitude, where the density is of air is less, supercharging increases the airflow rate thus fuel consumption rate decreases.
This set of Automobile Engineering Assessment Questions and Answers focuses on “Supercharging of IC Engines”. The engine crankshaft is coupled with the air compressor of the supercharger which drives the air compressor in the supercharger. To practice all areas of Automobile Engineering Assessment Questions, here is complete set of 1000+ Multiple Choice Questions and Answers.
If an engine equipped with a supercharger that compresses externally is running under boost conditions, the pressure inside the supercharger remains at ambient pressure; air is pressurized only downstream of the supercharger. Since the size of the supercharger is chosen to produce a given amount of pressure at high altitudes, the supercharger is oversized for low altitude. In addition to increasing the cost of running the aircraft a supercharger has the potential to reduce its overall range for a specific fuel load. As opposed to a supercharger driven by the engine itself, a turbocharger is driven using the otherwise wasted exhaust gas from the engine.
Superchargers are mechanically, electrically, or hydraulically driven pumps, compressors, or blowers employed to boost the pressure of the charge air in diesel engines or of the intake charge mixture in spark ignited engines. Most superchargers have traditionally been built around positive displacement compressors. With the focus to develop improved drives early in the 21st century, there has been a growth in interest in using superchargers based on centrifugal compressors.
Supercharger, in piston-type internal-combustion engines, air compressor or blower used to increase the intake manifold pressure of the engine. In aircraft piston engines, supercharging compensates for the reduced atmospheric pressure at high altitudes. Development of the gas turbine, which requires constant flow of air and fuel, brought the introduction of the turbosupercharger, or simply turbocharger, a centrifugal blower driven by a small gas turbine powered by the exhaust gases from the engine cylinders.
The aftercooler increases engine specific power output by providing the engine with a denser intake charge, and for s.i. engines the lower temperature also helps in preventing detonation, or knock. The net result is that turbocharged engines have lower brake specific fuel efficiencies than engines of equal size, but can provide some efficiency benefit when compared to engines of equal mid-range or top end power. If the VG turbocharger is used to enhance engine braking, it is very desirable to have knowledge of the exhaust and intake pressures, so that braking torque can be produced repeatably despite manufacturing variations in the engine or turbocharger, variations in ambient conditions, and lifetime changes in engine and turbocharger.
Common usage restricts the term supercharger to mechanically driven units; when power is instead provided by a turbine powered by exhaust gas, a supercharger is known as a turbocharger or just a turbo – or in the past a turbosupercharger. Because a supercharger uses the engine’s own power to spin itself, it siphons power more and more of it as the engine revs climb. Here a centrifugal supercharger is a winner, operating with superior efficiency over a positive displacement supercharger particularly at higher boost levels.
supercharging air compressor is driven by Related Question:
What drives the supercharger compressor?
Superchargers are typically driven via a mechanical drive—usually a belt—connected to the engine’s crankshaft. An electric motor can also be used to drive the supercharger, especially if the vehicle already has an electrical system with sufficient capacity.
How does a supercharger compressor work?
Superchargers increase intake by compressing air above atmospheric pressure without creating a vacuum. This forces more air into the engine, providing a boost. With the additional air, more fuel can be added to the charge, and the power of the engine is increased.
How is an aircraft supercharger driven?
A supercharger relies on an engine-driven air pump or compressor, while a turbocharger gets its power from the exhaust stream that runs through a turbine, which in turn spins the compressor. Aircraft with these systems have a manifold pressure gauge, which displays MAP within the engine’s intake manifold.
How is the air compressor driven in a piston engine supercharger?
supercharger, in piston-type internal-combustion engines, air compressor or blower used to increase the intake manifold pressure of the engine. Higher pressure increases the mass of air drawn into the cylinders by the pumping action of the pistons during each intake stroke.
Are superchargers belt driven?
Any supercharger is belt driven off of your accessory belts. As such its driven speed is directly connected to engine speed. If you double the engine speed the superchargers driven speed doubles.
Where does a supercharger mount?
The centrifugal supercharger is generally attached to the front of the engine with a rigid bracket and driven via a belt-drive or gear-drive from the engine’s crankshaft.
Whats a supercharger do?
A supercharger is an air compressor that increases the pressure of air supplied to an internal combustion engine. This aids in higher power output as the engine gets more oxygen in each of its intake cycles and helps it to burn more fuel.
What is meant by a supercharger?
Definition of supercharger : a device (such as a blower or compressor) for pressurizing the cabin of an airplane or for increasing the volume air charge of an internal combustion engine over that which would normally be drawn in through the pumping action of the pistons.
How is the air compressor driven in a position engine turbocharger?
A turbocharger consists of a compressor wheel and exhaust gas turbine wheel coupled together by a solid shaft and that is used to boost the intake air pressure of an internal combustion engine. The exhaust gas turbine extracts energy from the exhaust gas and uses it to drive the compressor and overcome friction.
What is a two stage supercharger?
A two stage supercharger used a compressor with two or more compression stages, often with an inter cooler between them, driven by a transmission with different gear ratios to control the compressor speed. A schematic of this type of supercharger can be seen here on a Rolls Royce Eagle engine.
What is external supercharger?
Externally driven superchargers (turbosuperchargers) are designed to deliver compressed air to the inlet of the carburetor or fuel/air control unit of an engine.
What type of pump is a supercharger?
Superchargers are mechanically, electrically, or hydraulically driven pumps, compressors, or blowers employed to boost the pressure of the charge air in diesel engines or of the intake charge mixture in spark ignited engines. Most superchargers have traditionally been built around positive displacement compressors.
Is compressor same as supercharger?
Yes. A supercharger and a turbo are both air compressors. They force air extra air into the engine by compressing it.
What is a supercharger blower?
A blower is just another name for a supercharger, particularly roots-type supercharger, which is probably one of the oldest styles of supercharger. At the heart of the roots-type supercharger are two counter-rotating meshed lobed rotors.
Does a supercharger need an intercooler?
Intercoolers are required for superchargers to ensure peak performance and longevity of your engine. The compressed air coming from the supercharger is too hot for combustion – it has to be cooled by intercoolers first.
