課程名稱︰熱力學
課程性質︰
課程教師︰許文翰
開課系所︰工科海洋系
考試時間︰93.6.15
試題 :
1.A double-acting compressor,with a piston displacement of 0.05m^3 per stroke,
operates at 500rev/min.The clearance is 5 percent and it receives air at 100
kPa and discharges it at 600kPa.The compression is polytropic,pV^1.35=C.
Determine the power required and the air discharged in cubic meters per
second.(25%)
2.An engine operates on the air-standard Otto cycle.The conditions at the
start of compression are 27。C and 100kPa.The heat added is 1840kJ/kg.The
compression ratio is 8.Determine the temperature and pressure at each point
in the cycle,the thermal efficiency,and the mean effective pressure.(25%)
3.An engine operates on the air-standard diesel cycle.The conditions at the
start of compression are 27。C and 100kPa.The heat supplied is 1840kj/kg.
The compression ratio is 16.Determine the maximum temperature and pressure,
the thermal efficiency,and the mean effective pressure.(25%)
4.An air-standard Brayton cycle has air enter the compressor at 27。C and 100
kPa.The pressure ratio is 10 and the maximum allowable temperature in the
cycle is 1350K.Determine (a)the pressure and temperature at each state in
the cycle;(b)the compressor work,turbine work,and the cycle efficiency per
kilogram of air.(25%)
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