【摘要】：雙吸離心泵以其高揚(yáng)程、大流量、良好的動平衡性能和抗空化性能而廣泛應(yīng)用于各生產(chǎn)領(lǐng)域。雖然與單吸離心泵相比雙吸離心泵的抗空化性能較好,然而在實際的工作過程中,雙吸泵的空化現(xiàn)象仍時有發(fā)生。同時,泵工作中產(chǎn)生的壓力脈動問題不僅會造成泵體的振動和噪聲,還會嚴(yán)重影響泵內(nèi)流體的流動,從而影響泵的揚(yáng)程、效率等性能,甚至破壞系統(tǒng)的穩(wěn)定運行,減少設(shè)備的使用壽命。因此,全面認(rèn)識雙吸離心泵的空化性能和壓力脈動特性對實際生產(chǎn)以及泵性能的研究具有重要的意義。本文從以下兩個方面進(jìn)行了研究分析:首先,對雙吸泵在不同的工況下進(jìn)行空化性能模擬,隨著泵進(jìn)口總壓的下降,葉輪葉片吸力面前緣先形成低壓區(qū)并逐漸向葉輪出口方向擴(kuò)展,且低壓區(qū)在葉片間不同流道內(nèi)的分布不均勻;空泡最先產(chǎn)生在葉片進(jìn)口稍后位置靠近前蓋板處,前蓋板的空化程度明顯大于后蓋板;空化揚(yáng)程的下降與空化尾跡區(qū)的漩渦有重大關(guān)系,漩渦引起的能量損失是導(dǎo)致?lián)P程急劇下降的主要因素。其次,設(shè)計了四種交錯角度的葉輪并進(jìn)行非定常計算,通過從時域和頻域等對監(jiān)測點在某一個計算周期的壓力變化性能分析,發(fā)現(xiàn)雙吸泵蝸殼中主要的壓力脈動頻率為葉片通過頻率及其倍頻,葉輪交錯45°時雙吸泵的壓力脈動幅值顯著減小,說明該雙吸泵的最佳葉輪交錯角為45°,并從流體流動狀態(tài)的角度對這一結(jié)論進(jìn)行了驗證。
[Abstract]:Double suction centrifugal pump is widely used in various fields for its high lift, large flow rate, good dynamic balance and cavitation resistance. Although the anti-cavitation performance of double-suction centrifugal pump is better than that of single-suction centrifugal pump, the cavitation phenomenon of double-suction pump still occurs in practice. At the same time, the pressure pulsation will not only cause the vibration and noise of the pump body, but also seriously affect the flow of fluid in the pump, thus affecting the performance of the pump, such as lift, efficiency, and even destroy the stable operation of the system. Reduce the service life of the equipment. Therefore, it is of great significance to understand the cavitation performance and pressure pulsation characteristics of double suction centrifugal pump for practical production and research of pump performance. In this paper, the following two aspects are studied and analyzed: firstly, the cavitation performance of the double suction pump is simulated under different operating conditions, with the decrease of the total inlet pressure of the pump. The front edge of suction of impeller first forms low pressure area and gradually extends to the outlet of impeller, and the distribution of low pressure region in different flow channels between blades is not uniform. The cavitation occurs at the later position of the blade inlet near the front cover plate, and the cavitation degree of the front cover plate is obviously greater than that of the rear cover plate. The decrease of cavitation head is closely related to the vortex in cavitation wake region, and the energy loss caused by the vortex is the main factor leading to the sharp decline of the head. Secondly, four kinds of impellers with staggered angles are designed and calculated unsteady. The performance of pressure variation of monitoring points in a certain period is analyzed from time domain and frequency domain. It is found that the main frequency of pressure pulsation in the volute of double suction pump is blade passing frequency and its double frequency, and the amplitude of pressure fluctuation of double suction pump is significantly reduced when the impeller is staggered 45 擄, which indicates that the optimum interleaving angle of impeller is 45 擄. The conclusion is verified from the point of view of fluid flow state.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH311

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