Answer:
1) The three possible assumptions are
a) All processes are reversible internally
b) Air, which is the working fluid circulates continuously in a closed loop
cycle
c) The process of combustion is depicted as a heat addition process
2) The diagrams are attached
5) The net work per cycle is 845.88 kJ/kg
The power developed in horsepower ≈ 45374 hP
Explanation:
1) The three possible assumptions are
a) All processes are reversible internally
b) Air, which is the working fluid circulates continuously in a closed loop
cycle
c) The process of combustion is depicted as a heat addition process
2) The diagrams are attached
5) The dimension of the cylinder bore diameter = 3.7 in. = 0.09398 m
Stroke length = 3.4 in. = 0.08636 m.
The volume of the cylinder v₁= 0.08636 ×(0.09398²)/4 = 5.99×10⁻⁴ m³
The clearance volume = 16% of cylinder volume = 0.16×5.99×10⁻⁴ m³
The clearance volume, v₂ = 9.59 × 10⁻⁵ m³
p₁ = 14.5 lbf/in.² = 99973.981 Pa
T₁ = 60 F = 288.706 K
![\dfrac{T_{2}}{T_{1}} = \left (\dfrac{v_{1}}{v_{2}} \right )^{K-1}](https://tex.z-dn.net/?f=%5Cdfrac%7BT_%7B2%7D%7D%7BT_%7B1%7D%7D%20%3D%20%5Cleft%20%28%5Cdfrac%7Bv_%7B1%7D%7D%7Bv_%7B2%7D%7D%20%20%5Cright%20%29%5E%7BK-1%7D)
Otto cycle T-S diagram
T₂ = 288.706*
= 592.984 K
The maximum temperature = T₃ = 5200 R = 2888.89 K
![\dfrac{T_{3}}{T_{4}} = \left (\dfrac{v_{4}}{v_{3}} \right )^{K-1}](https://tex.z-dn.net/?f=%5Cdfrac%7BT_%7B3%7D%7D%7BT_%7B4%7D%7D%20%3D%20%5Cleft%20%28%5Cdfrac%7Bv_%7B4%7D%7D%7Bv_%7B3%7D%7D%20%20%5Cright%20%29%5E%7BK-1%7D)
T₄ = 2888.89 /
= 1406.5 K
Work done, W =
×(T₃ - T₂) -
×(T₄ - T₁)
0.718×(2888.89 - 592.984) - 0.718×(1406.5 - 288.706) = 845.88 kJ/kg
The power developed in an Otto cycle = W×Cycle per second
= 845.88 × 2400 / 60 = 33,835.377 kW = 45373.99 ≈ 45374 hP.