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Abstract:The contribution describes the results of numerical flow simulations and experiments with so called auxiliary (relay) nozzles, used on powerful air jet weaving looms, further with complicated air flows interactions with the complicated reed wall, observing the nozzle setting toward the reed wall, the manufacturing of elements of the reed.

So-called wall flows are usable in many technical applications as a simple and reliable device for exhausting of light materials as dust, smoke, hot air, etc. In another cases, such flows can make troubles by treatment of light materials as fibers, etc. and it is necessary to suppress the wall effects by suitable design adjustments. But there is described a useful effect of wall flows on quality of fibrous product, too.

This contribution describes the result of a theoretical design for the gentle aerodynamical braking of linear body (weft yarn) transported by air flow. The dynamic model for movement of a discrete mass points system is the main part of the system, the supposed braking force actions result from numerical flow modelling. Theoretical results of such modelling experiments, applied in practice, result in the very expressive production increasing in comparison with the state-of-the-art, together with expressive fabric quality increasing, too.