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Application of numerical modeling to optimize the thermal cycle of the internal combustion engine

Jamrozik A., Tutak W.

Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej

2012

Vol. 11, nr 2

43-52

The paper presents the results of numerical modeling of the complete thermal cycle of the Andoria 1hc102 test engine. Modeling was carried out in the AVL Fire program. Modeling was used in order to determine the optimal ignition angle of the test IC internal combustion (IC) engine. Model tests were carried out for the spark ignition (SI) engine to operate with excess air ratio equal to λ = 1.2. As a criterion for estimating the quality of engine operation cycle, a value of maximum indicated pressure and indicated efficiency were taken. An additional criterion taken was the so-called knock combustion that limits engine performance. Courses of heat release rate and total heat release as a result were obtained. Modeling results show that the test engine powered by a lean mixture of λ = 1.2, should work with the ignition advance angle equal to 12 deg before top dead centre (BTDC). At this ignition advance angle in the engine knock occurred and the engine reached the indicated pressure and the indicated efficiency and were equal to respectively 0.82 MPa and 34.6%.

Estimating recoverable work of an engine by utilizing the CO2 Brayton power cycle and capturing heat lost

Farzaneh-Gord M., Reza Behi M., Yahyaie A., Ali Akbar Mirmohammadi S.

Archives of Thermodynamics

2009

Vol. 30, no. 3

89-110

The present work provided details of energy accounting of a natural gas powered internal combustion engine and recoverable work by utilizing a CO2 Brayton power cycle. Based on experimental performance analysis of a new designed IKCO (Iran Khodro Company) 1.7 liter natural gas powered ICE, full energy accounting of the engine was carried out on various engine speeds and loads. Further, two possible CO2 Brayton cycle configurations have been appointed to take advantages of engine heat lost. Based on thermodynamic analysis, the amount of recoverable work, obtainable by CO2 Brayton cycles have been calculated on various engine conditions. The results show that as much as 17 kW power could be generated by the power cycle which is a considerable amount of power especially if compared with the engine brake power.