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

【摘要】：隨著科學(xué)技術(shù)的不斷發(fā)展,現(xiàn)代工農(nóng)業(yè)對于水力機(jī)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(yán)重的情況下,效率,強(qiáng)度和穩(wěn)定性無疑成為三個最為重要的性能指標(biāo),效率關(guān)系到對能量的利用,強(qiáng)度關(guān)系到做功部件葉輪的壽命,而穩(wěn)定性則關(guān)系到機(jī)組是否能安全,正常的運(yùn)行,事實(shí)上他們之間并不是相互獨(dú)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(biāo)之間的關(guān)系也就成了水力機(jī)械設(shè)計(jì)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(jì)算流體動力學(xué)為理論基礎(chǔ),運(yùn)用先進(jìn)的計(jì)算機(jī)數(shù)值計(jì)算技術(shù),對混流泵整機(jī)模型在多個工況點(diǎn)下進(jìn)行全三維的定常湍流數(shù)值模擬,揭示了三種特征工況點(diǎn)下其內(nèi)部流場的主要機(jī)理,同時對葉輪做出必要的優(yōu)化改型,從而提高了設(shè)計(jì)工況點(diǎn)下的效率,為探討混流泵機(jī)組的穩(wěn)定性,還對上述計(jì)算模型進(jìn)行非定常的湍流數(shù)值模擬,詳細(xì)分析了混流泵內(nèi)部流場各監(jiān)測點(diǎn)壓力脈動的變化情況。此外,大量文獻(xiàn)報(bào)道由于水力機(jī)械機(jī)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(jī)組還伴隨著強(qiáng)烈振動與機(jī)械噪音,對此,本文應(yīng)用流固耦合技術(shù)對混流泵葉輪進(jìn)行靜力強(qiáng)度和模態(tài)的力學(xué)特性分析,為混流泵通流部件的強(qiáng)度設(shè)計(jì)與校核及機(jī)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(jī)械設(shè)計(jì)階段不能只是一味地追求效率,還應(yīng)顧及強(qiáng)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(yùn)行平穩(wěn)安全可靠的水力機(jī)械產(chǎn)品為出發(fā)點(diǎn),不斷完善其結(jié)構(gòu)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(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH313

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本文編號：1667551