需要金幣： 1000 個金幣 |
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| 轉(zhuǎn)換比率：金額 X 10=金幣數(shù)量， 例100元=1000金幣 | 論文字?jǐn)?shù)：12036 |  | |
| 折扣與優(yōu)惠：團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要:池塘養(yǎng)殖業(yè)在我國擁有悠久的歷史，最早可以追溯到3000年前。但漁業(yè)機械在我國的發(fā)展是從上個世紀(jì)七十年代開始的。這些設(shè)備有效的解決了魚塘增氧的問題，提高了漁民的產(chǎn)量。隨著時代的進步，我們也愈來愈感覺到漁業(yè)機械的進步。 水中的溶解氧氣是魚類賴以生存的最基本條件之一?，F(xiàn)有的用于池塘增氧的增氧裝置或多或少存在了一些問題缺陷?，F(xiàn)有的增氧機增氧的速度和效率比較低下，并且還需要配備一些大型的設(shè)備，比較耗工耗時，消耗了大量的資源。 這次的設(shè)計在于設(shè)計一種新型的自激振蕩脈沖射流增氧機，克服現(xiàn)有的增氧機的一些弊端，節(jié)約能源。本次設(shè)計要求要確定自激振蕩脈沖發(fā)生的條件，以及自激振蕩腔室的建立，并且在理論分析的基礎(chǔ)上，參照一些實驗來確定自激振蕩腔室的碰撞壁的結(jié)構(gòu)形狀及其尺寸及對自激振蕩效果的影響，腔室其他的結(jié)構(gòu)尺寸參數(shù)，討論各結(jié)構(gòu)尺寸的選用會對自激振蕩的效果的影響。并在參考一般自激振蕩脈沖增氧機的設(shè)計經(jīng)驗的基礎(chǔ)上，確定了增氧機的其他部分的結(jié)構(gòu)參數(shù)。本次設(shè)計的關(guān)鍵在于采用新型的自激振蕩腔室代替?zhèn)鹘y(tǒng)增氧機的混合管（喉管），使吸入的空氣和需要氧氣的水流在腔室中產(chǎn)生自激振蕩并且達到充分的攪拌、混合和充氧作用，使水體中的氧濃度達到飽和后再以脈沖的方式通過擴散管釋放出去。 關(guān)鍵詞 ：氧傳質(zhì)系數(shù)，剪切場，自激振蕩，充氧性能，脈沖方式
ABSTRACT:Pond aquaculture has a long history in our country, the earliest can be traced back to 3000. But the fishery machinery in the development of our country starts from on century seventy's. The device effectively solves the problem of fishpond oxygen-increasing, improve the yield of fishermen. With the progress of the times, we have more and more feel the progress of fishery machinery Dissolved oxygen is one of the most basic conditions for fish survival. The available oxygen aerator ponds exist some defects. Oxygen aerator existing speed and low efficiency, and also need to be equipped with some large equipment, more time and labour, consumes a lot of resources Research topic of this is the design of a self-excited oscillation pulsed jet aerator model, overcome some disadvantages existing aerators, energy saving. The design requirements to determine the self-excited oscillation pulsed condition, and the establishment of the self-excited oscillation cavity, and on the basis of theoretical analysis, according to some experiment to determine the shape and size of the collision wall self-excited oscillation cavity and the influence of the self-excited oscillation effect, chamber structure size of other parameters, discusses the influence of the structure the size of the self-excited oscillation effect. Based on the design experience of general self-excited oscillation pulsed aerator on the other part, the structure parameters of the aerator. This design is the key of mixing tube using self-excited oscillation cavity model instead of the traditional aeration machine (throat), so that the suction air and oxygen water in the chamber produces self-excited oscillation to stirring, mixing and oxygenation adequately, the oxygen concentration in water up to saturation and then in a pulsed mode through the diffusion tube for release. Keywords: overall oxygen transfer coefficient, the shear field, self-excited oscillation, oxygenation performance, pulse mode
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