The CAE Analysis of a Cylinder Head Water Jacket Design for Engine Cooling Optimization

Hyundai's new engine is developed which optimize the cooling efficiency for knocking improvement and friction reduction. The cooling concepts for this purpose are 1) equalizing the temperature among cylinders by flow optimization, 2) cooling the required area intensively, 3) adopting ‘active flow control’ and 4) enlarging fuel economy at high speed range. In order to realize the cooling concept, 1) cross-flow, 2) compact water jacket & exhaust cooling, 3) flow control valve and 4) cylinder head with integrated exhaust manifold are considered. Improvement of knocking and friction reduction by increased cooling water temperature makes fuel efficiency possible. On the other hand, in order to strengthen the cooling around the combustion chamber and to reduce the deviation among the combustion chamber of cylinders, it is required to design the head water jacket shape accordingly. It is a very important task to decide the appropriate cooling water capacity in water jacket and to secure the cooling flow in the main parts through smooth cooling water flow. Increasing engine cooling is an effective way to improve knocking but excessive engine cooling performance creates unnecessary cooling losses so it is important to configure the combustion chamber ambient cooling appropriately.