抄録
The distribution of air velocity through the weaving shed was studied when substreams were added from outside of the shed on an air-jet loom, in order to get some valuable instructions for improving the weft flying performance. The results are:
1. A simple velocity potential was proposed on the air flow from two nozzles obliquely and symmetrically set against their symmetrical axis. The approximation to the real air flow experimentally obtained was quite good.
2. Two simple pipes were set as above mentioned in the free open air to get the air flow experimentally, from which the optimum angle of nozzle inclination to the symmetrical axis was calculated to get the maximum weft propulsive force. The result shows that the optimum angle is 18 degrees, which, however, should be much lower in case where nozzles are applied to the weaving shed.
3. Air in shed was liable to flow toward the reed. Therefore, both the position showing the highest air velocity in any plane vertical to the shed axis and the weft path shifted gradually toward the reed.
4. Such a nozzle for substream addition was most suitable as its outlet area was wide near the reed and narrow near the cloth fell in proportion to the shed shape, and was composed of many small holes.
5. While flying through the shed, the weft-front was liable to buckle in to a lump. This caused the difference between the weft velocity passing through the main nozzle and the weft-front velocity.
