1) Describe how actual internal combustion engine cycle (i.e. Otto and Diesel) thermal efficiency differ from the ideal one at the same power output. 2) Discuss the dependency of the thermal efficiency of the ideal Otto cycle oncompression ratio and engine knock.
1) Describe how actual internal combustion engine cycle (i.e. Otto and Diesel) thermal efficiency differ from the ideal one at the same power output.
2) Discuss the dependency of the thermal efficiency of the ideal Otto cycle oncompression ratio and engine knock.
3a) Discuss, in your own words, the concepts of velocity boundary layer
and temperature boundary layer. Provide some analysis of how and
why these two concepts are important in convective heat transfer
3b) For a flat plate, discuss in your own words, how the rate of heat
transfer and convective heat transfer coefficient are determined for
forced convection and natural (free) convection. In your discussion,
analyse how laminar and turbulent flows are treated.
4. A 9 kN tensile load will be applied to a 50 m length of steel wire with E=200 GPa.
Knowing that the normal stress must not exceed 150 MPa and that the increase
in the length of the wire should be at most 25 mm, determine the smallest
diameter wire which can be used.
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