MAE2_Lecture13

MAE2_Lecture13 - Propulsion I Propellers Piston Engines...

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Propulsion I Propellers Piston Engines Thrust Equation Jet Engines MAE 2 NASA Image
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2 MAE 2 Propellers The propeller is made up of a series of rotating wings or “blades”. Propeller theory is more complex than simple wings. The blades may have complicated shapes that vary with span. The aerodynamic flow around each blade may interact. r V r V Airflow direction over propeller blade Velocity from propeller rotation Propeller blade pitch angle Freestream velocity r = blade radial position = propeller angular velocity = r = blade pitch angle
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3 MAE 2 Propeller Forces Engine power is used to overcome drag forces on the propeller blades. Lift from each propeller blade creates a thrust force to propel the airplane forward. r V T L D T = L cos − D sin =− L = lift D = drag T = thrust force
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4 MAE 2 Propeller Efficiency The propeller efficiency is the ratio of power available from the propeller (to move the airplane) to the power delivered by the engine. = T
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MAE2_Lecture13 - Propulsion I Propellers Piston Engines...

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