Based on finite time thermodynamic theory and an endoreversible modified Diesel cycle via isothermal heat addition model established in the existing literature,the performance characteristics are analyzed by taking the efficient power as the objective function.The influences of cycle parameters on the efficient power are analyzed and the performance differences under the maximum efficient power and the maximum power conditions are compared through numerical calculations.The results show that the relationship curve between efficient power and compression ratio is a parabolic-like one and the relationship curve between efficient power and efficiency is a loop-shaped one.With the increases of the cycle temperature ratio and the pre-expansion ratio and the decrease of heat transfer loss coefficient,the maximum efficient power,the optimal compression ratio,the maximum efficiency and the efficiency corresponding to the maximum efficient power all increase.Under the same condition,the efficiency corresponding to the maximum efficient power is higher than that of corresponding to the maximum power,the cycle efficiency has been greatly improved with the sacrifice of part power when taking the maximum efficient power as the objective function.
关键词
有限时间热力学/等温加热修正Diesel循环/最大有效功率/最大功率/性能比较
Key words
finite time thermodynamics/modified diesel cycle via isothermal heat addition/maximum efficient power/maximum power/performance comparison
维普
万方数据