用上翘型球首改善压载试航状态阻力性能

若干新船的模型阻力试验中~(［１，２］)，尽管压载试航状态的吃水和排水量均比满载状态小得多，然而将试验结果换算到实船，却出现了试航状态的有效功率大于满载状态的意外情况。对此，设计部门和船东都不能接受。本文介绍一种上翘型球首，将它替代原型船首，可使试航状态的有效功率显著地降至满载状态以下。

Adoption of Bend Upward Bulbous Bow to Improve Resistance Performance in Ballast Trial Condition

In model resistance tests of some new ships, though the draft and displacement of ballast trial condition are much less than that of the full load condition, the effective power of the ballast trial con- dition is higher than that of the full load condition, when the model test results are extrapolated to a full scale ship. The above mentioned result cannot be accepted by the ship designer and the owner. In this paper a bend upward bulbous bow is introduced. The effective power of the trial condition can be effectively reduced, when the bend upward bulbous bow is substituted for the original conventional bulbous bow.