Analysis and theoretical modeling of thermal influences on the inlet process for a spark-ignition engine

Theoretical Research to Improve the Performance of a Spark Ignition Engine by Using Zonal Cooling Principle

“…Based on the research made in the past (Ulian et al, 2018a;2018b), where is obtained a function, Eq. ( 1), that allows the calculation of the volumetric efficiencyin dependence on the change in the coolant temperature from inside the cylinder head in accordance with the principle of zonal cooling of the engine, Fig.…”

“…𝛼 𝑙𝑝𝑟convective heat transfer coefficient from the cooling liquid to the reduced isothermal equivalent wall, which releases heat to the outside environment; 𝑇 𝑙𝑟coolant temperature from the cylinder head (Ulian et al, 2018a;2018b). Using a series of usual relations from the bibliography (Popa and Vintilă, 1977;Rakosi and Manolache, 2007), the specific equations regarding the engine performance with zonal thermal regime are further obtained.…”

“…Under these conditions, the required temperature distribution along the cylinder's walls is shown in Fig. 1 (Ulian et al, 2018a;2018b). Cooling of the cylinder head requires special attention due to the problems caused by non-uniform temperatures distribution.…”

“…To obtain this temperature of the cylinder head, were used two independent cooling circuits, one for the cylinder block and one for the cylinder head. A principle like this called differentiated cooling is known and has already been used, without being applied in series production car engines (Ulian et al, 2018a;2018b).…”

Cylinder Head Analysis from Thermal Point of View Using Finite Element Method (FEM) of a Spark Ignition Engine by Using Zonal Cooling Principle

“…The previous research shows that the fresh air-fuel mixture meets with the warm engine components and it is mixed with the residual gases from the combustion chamber. These processes lead to increasing the initial temperature of the fresh air-fuel mixture and to a drastic reduction of the volumetric efficiency (Ulian et al, 2018).…”