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Experimental study on flow structure of a dual-jet
Author(s):
SONG Jian
,
LI Gen-sheng
,
NIU Ji-lei
,
HUANG Zhong-wei
Pages:
90
-
94
Year:
2006
Issue:
1
Journal:
JOURNAL OF HYDRODYNAMICS
Keyword:
PIV
;
双射流
;
旋转射流
;
空化
;
喷嘴
;
Abstract:
应用PIV实验方法对由直射流和同心的环状旋转射流组成的双射流流场进行了测量,并分析研究了流场的速度和旋度变化规律.分析表明,双射流等速核长度较小,仅约为5倍喷距;随喷距的增加其多股射流特性逐渐减弱,其主要原因为直射流和旋转射流在交界面上很强的剪切作用;旋转射流的径向发展因受直射流吸附作用的影响而减小,相应直射流速度在喷嘴轴线上的衰减则增加.在4-6倍喷距间的旋转射流速度突然下降和相应位置处旋度场的涡环都显示该处可能存在较强的空化现象,而大大提升双射流的能力.
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