Problem#5 Aircrafts propellers performance is characterized by the power coefficients, c, and advance ratio, / which are

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Problem 5 Aircrafts Propellers Performance Is Characterized By The Power Coefficients C And Advance Ratio Which Are 1 (72.21 KiB) Viewed 12 times

Problem#5 Aircrafts propellers performance is characterized by the power coefficients, c, and advance ratio, / which are the non-dimensional power required, PW), to derive the propeller and non-dimensional linear velocity, respectively. The power coefficient is a function of the propeller blade pitch angle at three quarters the blade radius deg the flight speed V [m/s] the propeller rotational speed n/res/star density plkg/ml, and diameter. Den] Hence, Po(npDV #₁) Scanned by CamS L Use dimensional analysis to obtain expressions for cpand J. Use p.n and D as repeating parameters. (The advance ratio is the second non-dimensional group obtained by combining the flight velocity, V. with the repeating parameters) 11. Consider an aircraft flying at 230 km/hr at sea level. A propeller with a 1.0m diameter is attached to the engine. If the design advance ratio is/= 0.9 and the 8/4 = 25, using the chart below calculate. a. The propeller's power coefficient, cp. and efficiency. b. The propeller's rotational speed n c. The engine power if np Prequired/Pactual = 0.5- 04-4 0.3 40 35 -0.90 30° 021 25 0.1 20 15% 0 D 02 04 06 08 10 12 14 16 18 20 2 0.30 -0.40 -0.50 -0.50 0.70 - -0.25 -0.80- -0.85-