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Vehicular Engines
Published in G. K. Awari, V. S. Kumbhar, R. B. Tirpude, Automotive Systems, 2021
G. K. Awari, V. S. Kumbhar, R. B. Tirpude
There are three types of superchargers in use:Centrifugal typeIn this type, the impeller rotates in a closed casing. It operates on the principle of centrifugal force. Due to centrifugal action, the pressure of inlet air increases. Considerable quantity of air can be delivered by relatively small size of centrifugal type superchargers.Roots typeIt consists of two cylindrical lobes rotating in opposite directions, and in same casing. One rotor is connected to the other by gears so both rotors rotate at the same speed. The roots blower operates on the principle of gear pump. The mixture supplied to the outlet has more pressure compared to the inlet mixture.Vane typeIt consist of a drum on which a number of vanes mounted enclosed in a casing. Against the spring force, the vanes slide in and out and maintain continuous contact with the body. The space between the drum and the inner surface of the body decreases from the inlet to the outer side of the body. The quantity of air which enters at the inlet decreases in volume, which increases outlet pressure.
Internal Combustion Engines
Published in D. Yogi Goswami, Frank Kreith, Energy Conversion, 2017
David E. Klett, Elsayed M. Afify, Kalyan K. Srinivasan, Timothy J. Jacobs
Two types of superchargers are in use: the positive displacement type (Roots blower) and the centrifugal type. Roots blowers may be classified as: (1) straight double lobe; (2) straight triple lobe; and (3) helix triple lobe (twisted 60%). The helix triple-lobe type runs more quietly than the others and is generally recommended, especially for Diesel engines operating under high torque at various speed conditions. Because of its high capacity and small weight and size, the centrifugal type is best suited for applications in which power and volumetric efficiency improvement are required at high engine speed, e.g., with aircraft engines. A centrifugal blower will also survive a backfire more readily than a Roots blower in SI applications. Because superchargers are directly driven from the engine output shaft, no inherent lag in the rate of pressure increase with engine speed is present, as is typically the case with turbochargers.
Automotive Trends in Europe
Published in Leslie R. Rudnick, Synthetics, Mineral Oils, and Bio-Based Lubricants, 2020
Many European heavy-duty diesel engines (and an increasing number of passenger car diesel engines) are either turbocharged or supercharged. These engines use forced induction of air in order to improve combustion efficiency. This is achieved by blowing air into the inlet manifold under pressure. A turbocharger is a turbopump which is driven by the engine’s exhaust gases, while a supercharger is a mechanical pump driven from the engine’s crankshaft. Larger diesel engines tend to be supercharged. Turbocharging and supercharging increase the specific power output of the engine by improving “breathing,” so that more oxygen is available for combustion.
Performance characteristics of air intake pleated panel filters for internal combustion engines in a two-stage configuration
Published in Aerosol Science and Technology, 2018
Figure 8 shows the predicted mileage (for various dust concentrations in the air) for a truck with a Vss = 12.88 dm3 internal combustion engine with a supercharged air cooler with a single-stage filtration system (filter paper or non-woven fabric) or a two-stage filtration system (cyclone–filter paper or cyclone–non-woven fabric).