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Download Mixture Formation in Spark-Ignition Engines by Univ.-Prof. Dipl.-Ing. Dr. sc. techn. Hans Peter Lenz PDF

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By Univ.-Prof. Dipl.-Ing. Dr. sc. techn. Hans Peter Lenz (auth.)

Twentyfour years have passed by because the ebook of ok. Lohner and H. MOiler's comprehen­ sive paintings "Gemischbildung und Verbrennung im Ottomotor" in 1967 [1.1]. clearly, the sphere of blend formation and combustion within the spark-ignition engine has wit­ nessed nice technological advances and lots of new findings within the intervening years, in order that the time appeared ripe for providing a precis of contemporary study and advancements. There­ fore, I gladly took up the recommendation of the editors of this sequence of books, Professor Dr. H. record and Professor Dr. A. Pischinger, to write down a publication summarizing the current state-of-the-art. a middle of job of the Institute of Internal-Combustion Engines and car Engineering on the Vienna Technical collage, which i'm heading, is the sphere of combination formation -there­ fore, many new effects which were completed during this quarter in collaboration with the respective were incorporated during this quantity. the fundamental rules of combustion are mentioned purely to that volume which appeared useful for an figuring out of the consequences of combination formation. the focus of this quantity is the combination formation in spark-ignition engines, overlaying either the idea and real layout of the aggregate formation devices and acceptable consumption manifolds. additionally, the comparable size expertise is defined during this work.

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Additional info for Mixture Formation in Spark-Ignition Engines

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32, a specific swirl motion of the charge is generated during the compression stroke. The spark plug is located at the outer circumference of the combustion chamber portion which extends below the exhaust valve. There is a great number of commonly known configurations of divided combustion chambers for spark-ignition engines. Fig. 33 shows a cross-sectional view of a Volkswagen PCI (PreChamber-Injection) engine. A gasoline nozzle directly injects into the prechamber, where ignition is also initiated.

A central spark-plug location is made possible by providing four valves per cylinder; this arrangement ensures fast and uniform combustion. Fig. 31 shows the effect of squish area on burning time. By changing from combustion-chamber design A, with a 43% squish area portion, to design B (73%), it has been possible to reduce the burning time from 55° crank angle to 35° crank angle. In the May-Fireball combustion chamber, Fig. 32, a specific swirl motion of the charge is generated during the compression stroke.

27. 50 ';"" E 40 0 "a. =, Q) L- 20 Q) L- 10 :J fIJ fIJ a.. 5 ~\ I ms i N 1\. '" ~. t.. --...... -::. 4 ms ~ ~- i 19nition point -125-100 -75 -50 -25 TDC 25 50 75 100 125 Degrees crank angle Fig. 27. 4. 6. Combustion Knock The terms "knocking" or "pinking" are used to describe a near detonating combustion as compared to a normal combustion process. An extremely steep pressure rise - up to about 8 bar per degree crank angle or up to 50,000 bar per second- is observed during this event. Combustion knock is caused by spontaneous oxidizing reactions in the hot unburned charge portion.

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