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  本文選題：雙蝸殼　切入點：混流泵　出處：《華中科技大學》2011年碩士論文

【摘要】：隨著科學技術的不斷發(fā)展,現(xiàn)代工農業(yè)對于水力機械各方面的性能也提出了更高的要求,在空化和汽蝕現(xiàn)象不是很嚴重的情況下,效率,強度和穩(wěn)定性無疑成為三個最為重要的性能指標,效率關系到對能量的利用,強度關系到做功部件葉輪的壽命,而穩(wěn)定性則關系到機組是否能安全,正常的運行,事實上他們之間并不是相互獨立的,而是緊密聯(lián)系在一起的,因此探討這三個重要的性能指標之間的關系也就成了水力機械設計過程中不可避免的敏感話題。 本文以某一雙蝸殼式混流泵為研究對象,以計算流體動力學為理論基礎,運用先進的計算機數(shù)值計算技術,對混流泵整機模型在多個工況點下進行全三維的定常湍流數(shù)值模擬,揭示了三種特征工況點下其內部流場的主要機理,同時對葉輪做出必要的優(yōu)化改型,從而提高了設計工況點下的效率,為探討混流泵機組的穩(wěn)定性,還對上述計算模型進行非定常的湍流數(shù)值模擬,詳細分析了混流泵內部流場各監(jiān)測點壓力脈動的變化情況。此外,大量文獻報道由于水力機械機組的葉輪受到持續(xù)的疲勞破壞,其葉片發(fā)生裂紋或者斷裂現(xiàn)象,并且整個機組還伴隨著強烈振動與機械噪音,對此,本文應用流固耦合技術對混流泵葉輪進行靜力強度和模態(tài)的力學特性分析,為混流泵通流部件的強度設計與校核及機組的振動分析提供一定的參考依據(jù)。 綜合以上的因素,我們必須注意到在水力機械設計階段不能只是一味地追求效率,還應顧及強度及穩(wěn)定性方面的制約,以研制和開發(fā)出既高效節(jié)能,又運行平穩(wěn)安全可靠的水力機械產品為出發(fā)點,不斷完善其結構和性能。
[Abstract]:With the continuous development of science and technology, modern industry and agriculture also put forward higher requirements for the performance of hydraulic machinery in all aspects. In the case of cavitation and cavitation, efficiency is not very serious. Strength and stability are undoubtedly the three most important performance indexes. Efficiency relates to the utilization of energy, strength relates to the life of the impeller, and stability relates to the safety and normal operation of the unit. In fact, they are not independent of each other, but are closely related. Therefore, exploring the relationship between these three important performance indicators has become an inevitable sensitive topic in the process of hydraulic machinery design. In this paper, a double volute mixed-flow pump is used as an object of study. Based on the theory of computational fluid dynamics (CFD), advanced computer numerical calculation techniques are used. Three dimensional steady turbulent numerical simulation is carried out on the model of mixed-flow pump under multiple operating conditions, which reveals the main mechanism of internal flow field at three characteristic operating conditions, and makes necessary optimization modification of impeller. In order to study the stability of mixed-flow pump unit, unsteady numerical simulation of turbulent flow is carried out on the above model. The variation of pressure pulsation at various monitoring points in the flow field of a mixed-flow pump is analyzed in detail. In addition, it is reported in a large number of literatures that cracks or breakages occur in the blades of hydraulic machinery units due to the continuous fatigue failure of their impellers. And the whole unit is accompanied by strong vibration and mechanical noise. In this paper, the static strength and modal mechanical characteristics of the impeller of the mixed flow pump are analyzed by using fluid-solid coupling technology. It provides a certain reference for strength design, check and vibration analysis of flow passage parts of mixed-flow pump. Taking the above factors into account, we must note that in the design phase of hydraulic machinery, we should not only pursue efficiency blindly, but also take into account the constraints of strength and stability in order to develop and develop high efficiency and energy conservation. Running smoothly, safe and reliable hydraulic machinery products as the starting point, constantly improve its structure and performance.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH313

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本文編號：1667551