Size Effect of Interlacer:Part 2: Pressure Distribution of Air Flow in Interlacers
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概要
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In order to clarify the size effect of an interlacer, we measured air pressure distributions on the yam duct wall of interlacers with various sizes of both yarn duct and air jet nozzle for a wide range of the supplied air pressure in a rectification tank. The pressure in the yarn duct does not always increase with the supplied air pressure p and depends upon the diameter ratio Rd(=d/dn), where d and dn are the diameters of the yarn duct and the air jet nozzle, respectively. This is because expansion and compression waves occur alternately in the jet issuing from an air jet nozzle. In interlacers with Rd=2.0, at p=0.4 MPa the pressure ps on the yarn duct wall of interlacers with Ld_??_3.0 takes a maximum at Z=0 and monotonously decreases to the atmospheric pressure with |Z|. Here, Ld is the non-dimensional yarn duct length defined by ld/d(where ld is the yarn duct length), and Z is the non-dimensional axial coordinate scaled by d and measured with respect to the center of an air jet nozzle exit. The value of ps for Ld_??_3.7 takes a negative value near |Z|=1-3 and then increases to the atmospheric pressure. The value of ps for Ld_??_7.0 is equal to the atmospheric pressure in |Z|_??_3. At p=0.2MPa, ps having a maximum at Z=0 decreases monotonously with |Z| and equals the atmospheric pressure in |Z|_??_1. At p=0.4MPa, ps monotonously decreases with |Z| in the interlacers with Ld_??_3.0 and Rd=2.4 or with Ld_??_2.3 and Rd=1.6. It may be supposed that interlacers with Rd=1.6 and Ld=3.7-7.0 have high processability because the pressure distribution in these interlacers expresses a large variation in space.
- 社団法人 日本繊維機械学会の論文