21_22_23_Oil System.pdf - AVIATION HIGH SCHOOL Basic...

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AVIATION HIGH SCHOOL Revision D Basic / Advanced Jets October 2013 “It’s What You Need” to Know on : The Oil System a.n.c Name :_______________________________________________. Date :______________ Lesson # :______. Aim : What are the Purposes of the Oil System on a Gas Turbine Engine, & How does it accomplish them ? Lesson Introduction : Lubricating oil is often considered to be the life blood of an engine. Without it, the friction and wear produced between moving parts would cause an engine to deteriorate at a very rapid rate. In addition to reducing friction, lubricating oil is responsible for removing a great deal of engine heat. Additional functions of oil include creating a seal between moving parts, cushioning impact forces and compressive loads, cleaning the engine and protecting against corrosion. I. Oil. A. Definition : Oil is a fluid lubricant which is used primarily to reduce friction between moving parts and to prevent rust and corrosion. B. A lubricant is any natural or synthetic substance having greasy or oily properties which can be used to reduce heat, wear & friction between moving parts or to prevent and corrosion on metallic surfaces. II. Origins of Oil. A. Animal C. Vegetable B. Synthetic ( man made) D. Mineral ( a petroleum based mixture of hydrocarbons or oil from dead dinosaurs & plant matter) III. Functions of Oil A. The primary function of oil is to lubricate (reduce friction) & wear between moving parts. This primary purpose of oil is based on the separation of surfaces by a continuous, unbroken film of oil so that no metal to metal contact occurs. Metallic friction is replaced by the internal friction of the oil. B. Acts as a cushion between parts. C. Helps cool the engine by absorbing heat. 1. On a turbine engine, oil picks up the most heat from the turbine bearings. D. Aids in sealing / acts as a seal between two surfaces. 1. Oil coats / wets a surface really well, and this makes a good sealing surface between moving parts. E. Helps clean the engine by picking up debris and carrying them to the filter where they are removed. 1. The oil in a lubrication system reduces engine wear by serving as a cleaning agent. As the oil circulates it picks up foreign particles such as dirt, metal particles and carbon. These particles are held in suspension by the oil and carried to the filer where they are trapped and removed. F. Provide resistance to oxidation / corrosion by coating parts. 1. An oil film on metal surfaces forms a barrier against corroding substances reaching the metal . Page 1 of 10 Notebook page #:______
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IV. Oil Properties Introduction : Theoretically the perfect engine oil is thin enough to flow freely yet heavy or thick enough to stay in place and maintain an oil film between moving parts. A. Viscosity. Viscosity is the internal fluid friction of the oils molecules OR a measure of the oil’s resistance to flow.
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