Engineering, 08.10.2020 01:01 jadenweisman1
We wish to do a preliminary design sizing of a propeller that uses the Clark-Y airfoil with properties described in NACA TR-640. design calls for flight at 155 m/s at an altitude 3 where rho = 0.85 kg/m . Assume the engine provides 300 kW of power to the propeller and the rotational speed is 2500 rpm. Compare the required diameters, propulsive efficiency, and blade pitch at 0.75R for 3- and 4-bladed propellers. What is the corresponding thrust in each case? Calculate the Mach number based on air speed relative to the blade tip (VR, tip/a) for the 3- and 4-bladed propellers assuming the air temperature is 265 K.
Answers: 3
Engineering, 03.07.2019 15:10
Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.
Answers: 1
Engineering, 04.07.2019 18:10
Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise
Answers: 3
Engineering, 04.07.2019 18:10
Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way
Answers: 2
Engineering, 04.07.2019 18:10
The higher the astm grain size number, the finer the gran is. a)-true b)-false
Answers: 2
We wish to do a preliminary design sizing of a propeller that uses the Clark-Y airfoil with properti...
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