70000吨半潜船艉机舱主机排气管降阻的优化设计

Optimized design of the resistance reduction of main engine exhaust pipe in Aft cabin of 70,000-ton semi-submersible ship

70000吨半潜船艉机舱位于船舯尾部,而围井在右舷尾端,主机排气管需从船舯走到右舷,再走到尾端,最后穿过围井排出船外。排气管的长度和弯头数均超出常规油船的2.5倍,这些因素直接影响主机排气背压,需要专门对主机排气管进行优化设计,使之满足主机排气背压要求。