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144 Ileana Fulga and Eugen Strajescu 2. Clarifications about the Possibilities to improve the Spiral Jetmills' Activity, resulted from the Mathematical Model 2.1. The Supersonic Jet's Protection The construction of the Venturi tubes by where the material is introduced and of the nozzles from where the compressed air is blowing off represents an important factor for a good activity of the fluidic spiral jetmill. The super sonic nozzle (the one by where is insufflated fluid under pressure, realizing important debits) must have a determined length. The prolongation of the active area of the nozzle behind the peripheral wall, or nozzles with inclined termination, and not perpendicular on the axis's direction of the nozzle could realize a compressibility effect manifested in an opposite sense, because the boost pressure decrease, the circulation is reduced and the jet is displaced in a direction more nigh to the tangent. Of course this kind of position must be considered as "off-set" beside the desired equilibrium position, considered as "ideal". It could be imposed in that case the "protection" of the protuberant peak of the nozzle by an aerodynamic modeling of the peripheral wall of the milling room, or by the practice of some clefts on the same wall. 2.2. The Geometry of the Supersonic Jet It is proved that the employment of the convergent - divergent nozzles, at necessary and effective pressures do not present great advantages in the great majority of the practical applications. It is recommended for the reduction of the losing, the construction of jets as short as possible, with an alignment near the perfection, with the same radial angle. Because deviations from the alignment between different jets although minima, create important tourbillions, unequal, in the transversal flux, discontinuities in the peripheral circulation of the particles and tourbillions in the central classification vortex. 3. Practical Applications 3.1. The Optimization of the StarJet and CosmoJet Mills The APTM Enterprise realized a great number of researches in order to be able to optimize the activity of the produced spiral jetmills, presented in a great number of scientific papers [1] - [10] and in a doctoral dissertation.
Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 145 Fig. 1 – The analyzis of the evolution of the APTM spiral jetmills, considering the application of the process' optimization. The results presented in this doctoral dissertation were transposed in
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BULETINUL INSTITUTULUI POLITEHNIC D
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Papers presented at THE INTERNATION
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SILVIU BERBINSCHI, VIRGIL TEODOR, N
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CONSTANTIN CHIRIȚĂ, ADRIAN HANGAN
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Bul. Inst. Polit. Iaşi, t. LVI (LX
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(6) ⎧ ⎪ ⎨ ⎪ ⎩⎪ FR 1 FR
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then, under the principle of optima
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c) Calculate values (14) ⎧V ⎪
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Rate of recycling, [%] Bul. Inst. P
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Fig. 15 - Air velocity distribution
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Stachie Marius 221 Storm Kjærside
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