Problem 1 Otto Cycle (60 points)

Use an air-standard Otto cycle to model a 4-cylinder engine. At the beginning of compression, the

cylinder volume is 0.55L, the pressure is 98 kPa, and the temperature is 290 K. Copyright © 2023 Scott D

Sawyer. All rights reserved. This material may not be reproduced, distributed, transmitted, displayed,

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At the end of compression, the cylinder volume is 0.046L. The temperature at the end of the combustion

process is 2700 K. Use the specific heat ratio k = 1.4, and gas constant R = 287;

kg.K

Draw a schematic of the cylinder showing the volume at TDC, BDC, and displacement.

Draw the cycle on T-s diagram

Identify the 4 processes of the cycle

Determine:

(a) The compression ratio

(b) The engine displacement

(c) The temperature at the end of compression T₂

(d) The specific heat input qu (kJ/kg)

(e) The temperature at the end of the power stroke T4

(f) The specific heat loss q (kJ/kg)

(g) The specific work per cycle Wnet (kJ/kg)

(h) The mass of air in the cylinder (kg)

(i) The power produced by the engine at 8,500 rpm