Impact of Degrees of Freedom of Polyatomic Ideal Gas on Efficiency of Three-Stroke-Cycle Heat Engines

• 作者: Haiduke Sarafian
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: EFFICIENCY of Heat Engine Three-Stroke-Cycle ADIABATIC ISOTHERMAL Pro-cesses
• 年，卷（期）: xdwlyw_2018,（9）
• 页码范围: 1807-1813
• 页数: 7页
• 分类号: R73

摘要

It is customary to evaluate the efficiency of four-stroke-cycle heat engines such as Carnot, Otto and Diesel with a working ideal gas [1] [2] [3]. Here we consider various three-stroke-cycle heat engines that are composed of three out of four special processes: adiabatic, isothermal, isobaric and isochoric. We deviate from the customary norm considering the working material to be a polyatomic ideal gas with various degrees of freedom. We develop analytic expressions for the efficiency of each design as a function of degrees of freedom. For suitable practical values of relevant (V, P, T), we evaluate the corresponding efficiencies.