Thermodynamic analysis and performance maps for the irreversible Dual–Atkinson cycle engine (DACE) with considerations of temperature-dependent specific heats, heat transfer and friction losses

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

“…The third is to adopt more comprehensive and effective OPBs in the analysis and optimization of ICE performance, especially, multi-objective optimization procedures will be utilized. [85,223,323,324], Dual-Miller combined cycle [215,325,326] and Otto-Miller combined cycle [327]. The second is to establish new cycle models which are closer to practical cycles.…”

“…In the future, the analysis and optimization of ICE cycles by using FTT can further progress in the following aspects: the first is to perform FTT performance analysis and optimization for various new single cycles and combined reciprocating cycles, such as the Meletis-Georgiou cycle ( Figure 18 shows the T´s diagrams for Meletis-Georgiou cycle model, the isentropic compression processes are shown as 1 Ñ 2S and 3 Ñ 4S; the process of mixing between the working fluid at state 2 with part of the expanding working fluid at state 6 is shown as process 2 Ñ 3; the isochoric heat addition process is 4 Ñ 5; the isentropic expansion processes are shown as 5 Ñ 6S and 7S Ñ 8S; the separation process of the working fluid in expansion volume is shown as 6 Ñ 7; the isochoric and isobaric heat rejection processes are shown as 8 Ñ 9 and 9 Ñ 1) [303][304][305][306][307][308][309], rectangular cycle ( Figure 19 shows p´v diagram for the rectangular cycle model, the isochoric and isobaric heat addition processes are shown as 1 Ñ 2 and 2 Ñ 3; the isochoric and isobaric heat rejection are shown as 3 Ñ 4 and 4 Ñ 1) [310][311][312][313][314][315][316], Lenoir cycle ( Figure 20 shows T´s diagram for the Lenoir cycle model, the isochoric heat addition process is shown as 1 Ñ 2; the isentropic expansion processes is shown as 2 Ñ 3; the isobaric heat rejection is shown as 3 Ñ 1) [317][318][319][320][321][322], Dual-Atkinson combined cycle [85,223,323,324], Dual-Miller combined cycle [215,325,326] and Otto-Miller combined cycle [327]. The second is to establish new cycle models which are closer to practical cycles.…”

A comparison between Miller and five-stroke cycles for enabling deeply downsized, highly boosted, spark-ignition engines with ultra expansion

“…However, how to deal with knock in the simulation and how to determine the geometries of modified engines are not clear in these studies. Most recently, Gonca [34] conducted a theoretical analysis based on thermodynamics for the irreversible dual-Atkinson cycle engine with considerations of temperature-dependent specific heats, heat transfer and friction losses. The classical thermodynamics modeling and a new realistic finite-time thermodynamics modeling have also been included in his simulation.…”

Performance Analysis of an Atkinson Cycle Engine under Effective Power and Effective Power Density Conditions

“…The parameters and engine specifications used in the analysis are inlet pressure P 1 , inlet temperature T 1 , engine speed N , stroke L, bore d, residual gas fraction (RGF) friction coefficient µ, cylinder wall temperature T W , cycle temperature ratio α and their standard values are given as follows: 100 kPa, 300 K, 3600 rpm, 0.072 m, 0.062 m, 0.05, 12.9 N s/m, 400 K, 8, respectively. In the present model, the EE, EP, and EPD are given as below [19,20,33,38]:…”

“…Gonca and Sahin [32] carried out a thermo-ecological performance optimization for a dual AC engine. Gonca [33,34] performed a couple of investigation studies on the dual AC engine considering friction, heat transfer and temperature-dependent specific heats based on classical thermodynamics and FTT methods. Ebrahimi [35][36][37] carried out thermodynamic performance analyses for the dual cycle [35], MC [36] and AC [37] engines.…”