A modern jet engine has a temperature after combustions of about 1500 K at 32 00 kPa as it enters the turbine section (see state 3, Fig, P4.77). The compressor inlet is at 80 kPa , 260 K (state 1) and the outlet (state 2) is at 3300 kPa , 780 K ; the turbine outlet (state 4) into the nozzle is at 4 00 kPa , 9 00 K and the nozzle exit (state 5) is at 8 0 kPa, 64 0 K Neglect any heat transfer and neglect kinetic energy except out of the nozzle. Find the compressor and turbine specific work terms and the nozzle exit velocity.
A modern jet engine has a temperature after combustions of about 1500 K at 32 00 kPa as it enters the turbine section (see state 3, Fig, P4.77). The compressor inlet is at 80 kPa , 260 K (state 1) and the outlet (state 2) is at 3300 kPa , 780 K ; the turbine outlet (state 4) into the nozzle is at 4 00 kPa , 9 00 K and the nozzle exit (state 5) is at 8 0 kPa, 64 0 K Neglect any heat transfer and neglect kinetic energy except out of the nozzle. Find the compressor and turbine specific work terms and the nozzle exit velocity.
A modern jet engine has a temperature after combustions of about
1500
K
at
32
00
kPa
as it enters the turbine section (see state 3, Fig, P4.77). The compressor inlet is at
80
kPa
,
260
K
(state 1) and the outlet (state 2) is at
3300
kPa
,
780
K
; the turbine outlet (state 4) into the nozzle is at
4
00
kPa
,
9
00
K
and the nozzle exit (state 5) is at
8
0
kPa, 64
0
K
Neglect any heat transfer and neglect kinetic energy except out of the nozzle. Find the compressor and turbine specific work terms and the nozzle exit velocity.
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The cantilevered spandrel beam shown whose depth tapers from d1 to d2, has a constant width of 120mm. It carries a triangularly distributed end reaction.Given: d1 = 600 mm, d2 = 120 mm, L = 1 m, w = 100 kN/m1. Calculate the maximum flexural stress at the support, in kN-m.2. Determine the distance (m), from the free end, of the section with maximum flexural stress.3. Determine the maximum flexural stress in the beam, in MPa.ANSWERS: (1) 4.630 MPa; (2) 905.8688 m; (3) 4.65 MPa
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A concrete wall retains water as shown. Assume that the wall is fixed at the base. Given: H = 3 m, t = 0.5m, Concrete unit weight = 23 kN/m3Unit weight of water = 9.81 kN/m3(Hint: The pressure of water is linearly increasing from the surface to the bottom with intensity 9.81d.)1. Find the maximum compressive stress (MPa) at the base of the wall if the water reaches the top.2. If the maximum compressive stress at the base of the wall is not to exceed 0.40 MPa, what is the maximum allowable depth(m) of the water?3. If the tensile stress at the base is zero, what is the maximum allowable depth (m) of the water?ANSWERS: (1) 1.13 MPa, (2) 2.0 m, (3) 1.20 m
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A short plate is attached to the center of the shaft as shown. The bottom of the shaft is fixed to the ground.Given: a = 75 mm, h = 125 mm, D = 38 mmP1 = 24 kN, P2 = 28 kN1. Calculate the maximum torsional stress in the shaft, in MPa.2. Calculate the maximum flexural stress in the shaft, in MPa.3. Calculate the maximum horizontal shear stress in the shaft, in MPa.ANSWERS: (1) 167.07 MPa; (2) 679.77 MPa; (3) 28.22 MPa
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