AME 230 Lecture Notes - Lecture 3: Engine Knocking, Isentropic Process, Compression Ratio
16 Mar 2016
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Am e 2 3 0 - 1 2 nov 1 0. Page 1 of 2 - today 8:3 4 am. Homework is now 9. 1 and 9. 2 only: more for extra credit. Otto cycle has a spark, diesel cycle combustion comes by compression. Modeling otto cycle: constant volume combustion isentropic expansion: 3-4 isentropic compression: 1-2. 4-1: the exhaust, pushing it out so quickly that it"s at constant volume. The processes cant be adiabatic because there is heat transfer to the walls, thats why you need a radiator. Compression ratio higher than about 9:1 can create preignition, which is the fuel combusting before the spark. It may be possible to add ethanol to prevent preignition. Diesel engine: compression ignition engine, constant pressure engine area enclosed is the important value diatomic: 1. 4 air: n2 monotonic: M ade w i t h not es plus ipad app - ht t p:// not esplusapp. com.
