Abstract
To clarify the steady characteristics of torque converter against cavitation, numerical simulation of cavitation is carried out in several speed ratios of turbine to pump (0, 0.2, 0.4, 0.6, 0.8). The following relationships between the torque decrease and cavitation were found. All the speed ratios less than equal to 0.4, torque decreases because of decrease of mass flow by cavitation at stator. Second, at the speed ratio of 0.6, cavitation occurs at pump as well as at stator. Cavitation at pump changes meridional flow and causes increase of pump torque at certain pressure. Finally, speed ratios of 0.6 and 0.8, cavitation at pump would leads to sudden drop in torque.
