第10届国际物理奥林匹克竞赛试题及解答（英文）
Problem 1.
The compression ratio of a four-stroke internal combustion engine is The engine draws in air and gaseous fuel at a temperature 27oC at a pressure 1 atm = 100 kPa. Compression follows an adiabatic process from point 1 to point 2, see Fig. 1. The pressure in the cylinder is doubled during the mixture ignition (2–3). The hot exhaust gas expands adiabatically to the volume V2 pushing the piston downwards (3–4). Then the exhaust valve opens and the pressure gets back to the initial value of 1 atm. All processes in the cylinder are supposed to be ideal. The Poisson constant (i.e. the ratio of specific heats Cp=CV ) for the mixture and exhaust gas is (The compression ratio is the ratio of the volume of the cylinder when the piston is at the bottom to the volume when the piston is at the top.)






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