The marine medium-speed diesel engines are started by two methods;one is the electric motors,and the other air starting motors.Even though air starting motor is dependent of the engine types and sizes,it has been wide...The marine medium-speed diesel engines are started by two methods;one is the electric motors,and the other air starting motors.Even though air starting motor is dependent of the engine types and sizes,it has been widely used in this area due to its simplicity,convenience and reliability.The purpose of this paper is to give the designing parameters in order to make a proper "Air Starting Motor" using CFD.The aerodynamic approaches were given to understand the internal flow characteristics of the air starting motor.In addition,we have carried out the investigation of effects of tip clearance.In the calculations the tip clearance of air starting motor has been varied between 0,2.8,4.3 and 5.7% of blade span.The results of computation are the tip clearance increased to 2.8%,the torque decreased 24%,and there was no more large changes when the clearances increased to 4.3% and 5.7%.展开更多
基金supported by the Post BK21 project of Ministry of Education,Science & Technology,and National Research Lab.of Korea Research Foundation of Korea (R0A-2008-000-20069-0)
文摘The marine medium-speed diesel engines are started by two methods;one is the electric motors,and the other air starting motors.Even though air starting motor is dependent of the engine types and sizes,it has been widely used in this area due to its simplicity,convenience and reliability.The purpose of this paper is to give the designing parameters in order to make a proper "Air Starting Motor" using CFD.The aerodynamic approaches were given to understand the internal flow characteristics of the air starting motor.In addition,we have carried out the investigation of effects of tip clearance.In the calculations the tip clearance of air starting motor has been varied between 0,2.8,4.3 and 5.7% of blade span.The results of computation are the tip clearance increased to 2.8%,the torque decreased 24%,and there was no more large changes when the clearances increased to 4.3% and 5.7%.
