Internal Combustion Engine

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[pic]Unit 1 Title: Types of engines General objective: To understand the structure and various types of engines. Specific objectives: At the end of this unit you should be able to: 1. define and classify internal combustion engine. 2. draw and label four stoke and two stoke cycle. 3. explain four stroke cycle engine. 4. explain two stroke cycle engine. 5. explain the process of four and two stroke compression ignition engine. 6. explain the process of the Wankel engine ( Rotary ), 7. explain the process of opposed-piston engine 8. explain the process of turbine gas engine. [pic]Input This section introduces the subject matter that you are going to learn. 1.0 Introduction In this unit we are to discuss the spark ignition (SI) and compression ignition (CI). These are internal combustion ‘ heat engine’. Their function is to convert potential heat energy contained in fuel into mechanical work. An internal combustion engine can be classified in two different ways and they are spark ignition (SI) and compression ignition (CI). 1. Types of ignitions for the internal combustion engine. a. Spark Ignition (SI). An SI engine starts the combustion process in each cycle using a spark plug. The spark plug gives a high-voltage electrical discharge between two electrodes which ignites the air-fuel mixture in the combustion chamber surrounding the plug, Many forms of torch holes are used to initiate combustion from external flame. b. Compression Ignition (CI). The combustion process in a CI engine starts when the air-fuel mixture self-ignites due to high temperature in the combustion chamber caused by high compression. 1.2 Four Stroke Cycle 1.2.1 Induction stroke The air-plus-fuel charge is induced into

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