[en] Oxygenation has always played a very important and crucial role in inland aquaculture, since the dissolved and available oxygen for aquaculture species in production is the parameter that will mark the performance of any aquaculture farm. In inland aquaculture, it is common for water bodies in which fish and other aquatic organisms are reared to have low levels of dissolved oxygen, especially in times of high temperaturas or when there is an excess of organic matter in the water. Lack of oxygen can cause stress, disease and mortality in fish and other aquatic organisms. These episodes have caused, cause and will cause, very costly accidents to aquaculture companies, since they usually involve the loss of a large part of their production. Likewise, oxygenation is an expensive process, as well as essential, for any aquaculture facility, where the biomass present far exceeds that which the system can support, without additional oxygenation. Therefore, the design of efficient systems with operating costs as low as possible, involve a constant search among fish farmers. In general, the realization of models that allow to calculate and design oxygenation systems, by means of real scale models, suppose an excessively high level of investment, reason why the use, of mathematical models ors, has supposed a very significant advance in this field, since it allowsn, a considerable reduction of the necessary investment, as well as the possibility of repeating, changing and adjusting any model a greater number of times, with a considerable investment than necessary in the physical modes. Therefore, this doctoral thesis focuses on the evaluation of the yields of oxygen injection devices (venturis) in oxygenation wells, used in inland aquaculture, using numerical and experimental analysis methods. To this end, an extensive experimental campaign has been carried out, through laboratory-scale tests, using physical models, which represented a scale model of a real installation. Subsequently, using the data from the experimental campaign, validate the CFD numerical model, so that it can be used, in order to test other designs of oxygenation systems, dispensing with the physical model.

[gl] A oxixenacion xogou sempre un papel moi importante e crucial na acuicultura continental, xa que o oxixeno disolto e disponible para as especies acuicolas en producion, e o parametro que marcara o rendemento de calquera explotacion de acuicultura. Na acuicultura continental, e comun que as masas de auga nas que se crian os peixes e outros organismos acuaticos tenan niveis baixos de oxixeno disolto, especialmente en épocas de altas temperaturas ou cando hai un exceso de materia organica na auga. A falta de oxixeno pode causar estres, enfermidades e mortalidade nos peixes e outros organismos acuaticos. Estes episodios provocaron, provocan e provocaran, accidentes moi custosos as empresas acuicolas, xa que soen suponer a perda de boa parte da sua producion. Asi mesmo, a oxixenacion e un proceso custoso, a par que imprescindible, para calquera instalacion de acuicultura, onde a biomasa presente, supera con moito a que pode soportar o sistema, sen oxixenacion adicional. Por iso, o deseno de sistemas eficientes e con custos operativos o mais baixos posibles, suponen unha busca constante entre os acuicultores. En xeral, a realizacion de modelos que permitan calcular e desenar sistemas de oxixenacion, mediante modelos a escala reais, suponen un nivel de investimento excesivamente elevado, polo que o uso, de modelos matematicos, supuxo un avance moi significativo neste eido, xa que permiten, unha reducion considerable do investimento necesaria, asi como a posibilidade de repetir, cambiar e axustar calquera modelo un maior numero de veces, cun investimento considerablemete inferior a necesaria nos modelos fisicos. Por tanto, esta tesis doutoral centrarase na avaliacion dos rendementos, dos dispositivos de inxeccion de oxixeno (venturis) nos pozos de oxixenacion, utilizados na acuicultura continental, mediante a utilizacion de metodos de analise numerica e experimental. Para iso, realizouse unha campana experimental extensa, mediante ensaios a escala laboratorio, empregando modelos fisicos, que representaban un modelo a escala, dunha instalacion real. Para posteriormente, mediante os datos da campana experimental, validar o modelo numerico CFD, de tal forma que se poida utilizar, co fin, de testar outros desenos de sistemas de oxixenacion, prescindindo do modelo fisico.