T.V.Makarova, A.V.Zhukova, Yu.M.Dudzinskii Modeling the pulsating inner domain of a counter-flow hydrodynamical radiator |
Acoustic bulletin, Vol. 17 ¹ 2, (2015) |
| A simplified spherical model and truncated cone model are proposed to describe the pulsating cavitation area between the jets of the the counter-flow type jet hydrodynamic radiator. Each of the models are considered in two modifications: with the allowance for central jet from the nozzle and without taking it into account. The characteristic dimensions and spatial restrictions are determined for all mentioned models and, as well as own, apparent and total mass of the pulsating area (pulsator). The dependencies of the mass parameters from characteristic dimensions of models were obtained. The dominance of the apparent mass is shown. For spherical model, it is almost 6 times greater than pulsator's own mass. and is even greater for the conical case. The effect of the apparent mass increases with gas content of the dual-phase environment, i.e., under the developing cavitation. Considering of the central axial canal occupied by the jet from the nozzle also leads to increasing contribution of the apparent mass to the total mass of pulsator. The total masses of a pulsating area for various modifications of the models are found to be comparable due to cancellation effect of two factors: decrease of the pulsator's own mass due to subtraction of the cylindrical volume occupied by the jet from the nozzle along with simultaneous increasing of its apparent mass. |
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KEY WORDS: hydrodynamic sound generation, hydrodynamic radiating system, sound generating element of the cavitation nature, three-parameter model |
| TEXT LANGUAGE: Russian |