来复线(rifle),枪管中的膛线,让子弹产生自转,提高子弹射出后飞行中的稳定性。“来复”是英文单词“rifle”的音译。这个词本为德语,义为“作沟槽”,用以指在枪膛中的螺旋状沟槽。
这种新枪炮都加有来复线。
在有来复线的或其它的管壁皱纹的管中,由于引起副流,可能将非均质流转变为均质流。
Rifled or other pipe wall corrugation may change the flow from a hetero-generous to a homogeneous regime by introducing a secondary circulation.
人们将来复线(膛线)引入枪管之后提高了射击的精确度。 但是装弹和清膛仍然很麻烦。
The introduction of rifling, or cutting grooves, into a barrel had already improved accuracy, but the weapons remained difficult to load and clean.
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