本文選題：離心泵 + 出口邊傾角　； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：離心泵作為一種廣泛應(yīng)用的葉輪機(jī)械,目前已有大量學(xué)者對其在運行過程中存在的振動、噪音、運行效率較低和壓力脈動等問題進(jìn)行了相關(guān)研究并取得了大量成果。但仍然存在離心泵葉輪與導(dǎo)葉動靜耦合處壓力脈動較大,葉輪軸向力較大等問題。本文通過對一臺帶徑向?qū)~的單級單吸離心泵進(jìn)行模擬計算。分析葉片出口邊傾角為0°、5°、10°、15°、20°工況,得出傾角為15°時,對離心泵水力效率和壓力脈動強(qiáng)度改善效果最優(yōu)。葉片出口邊傾斜改型后葉輪軸向力大幅變化,對15。傾角模型泵進(jìn)行了平衡葉輪軸向力的改型研究。同時為繼續(xù)降低傾斜改型后離心泵內(nèi)的壓力脈動強(qiáng)度,對15。傾角模型泵,選取葉高系數(shù)為0.8、0.6、0.4的徑向正導(dǎo)葉分別進(jìn)行了改型研究。經(jīng)對比發(fā)現(xiàn):(1)葉片出口邊傾斜改型后:小流量下隨著葉片出口邊傾角增大,泵的揚(yáng)程下降率逐漸增大,大流量下隨著葉片出口邊傾角增大,泵的揚(yáng)程先逐漸增大后降低。葉片出口邊傾角為15°時模型泵的水力效率和壓力脈動強(qiáng)度改善效果最優(yōu),此時模型泵的額定工況點效率提升0.41%,1.13Q流量下效率提升0.53%,揚(yáng)程提升0.92%,模型泵性能曲線更平滑,模型泵的壓力脈動強(qiáng)度較改型前下降11.1%。(2)葉輪軸向力平衡:對葉輪出口邊15°傾角模型泵改變蓋板直徑發(fā)現(xiàn),降低前蓋板直徑可在不影響泵水力性能的情況下較好的降低葉輪軸向力。增加后蓋板直徑也可以達(dá)到平衡軸向力的目的,但會對葉輪出口處的流態(tài)產(chǎn)生影響,小幅度降低模型泵的水力性能;(3)徑向正導(dǎo)葉改型后:對15。傾角模型泵選擇不同的正導(dǎo)葉葉片高度繼續(xù)研究發(fā)現(xiàn),選擇合理的正導(dǎo)葉葉片高度可繼續(xù)降低模型泵內(nèi)的壓力脈動強(qiáng)度。當(dāng)正導(dǎo)葉葉高系數(shù)為0.6時各監(jiān)測點平均壓力脈動強(qiáng)度系數(shù)最低,較改型前下降11.0%。但降低正導(dǎo)葉葉片高度會使離心泵的高效區(qū)域逐漸變窄,徑向?qū)~的擴(kuò)壓能力逐漸下降。
[Abstract]:As a kind of widely used impeller machinery, a large number of scholars have studied the problems of vibration, noise, low efficiency and pressure pulsation in the process of operation. However, there are still some problems such as greater pressure fluctuation and greater axial force at the coupling of impeller and guide vane. In this paper, a single stage single suction centrifugal pump with diameter guide blade is simulated. In this paper, the working conditions of blade outlet slope angle 0 擄5 擄10 擄10 擄15 擄15 擄20 擄are analyzed. When the angle is 15 擄, the effect of improving hydraulic efficiency and pressure pulsation intensity of centrifugal pump is the best. The axial force of the impeller changed greatly after the blade exit edge tilted and modified. In this paper, the modification of axial force of impeller is studied. At the same time, in order to continue to reduce the pressure pulsation intensity in the centrifugal pump after tilting modification, 15. The radial positive guide vane with the blade height coefficient of 0.8 and 0.6% was selected for the model pump and the modification of the radial positive guide vane was carried out. The results show that: (1) after the blade exit edge tilting modification, the head drop rate of the pump increases gradually with the increase of the blade outlet slope angle under the small flow rate, and with the increase of the blade outlet edge inclination angle at the large flow rate, the pump head increases first and then decreases. The hydraulic efficiency and pressure pulsation intensity of the model pump are the best when the angle of blade outlet slope is 15 擄. At this time, the efficiency of the model pump is increased by 0.53 at the rated working point of 0.41 and 1.13Q, and the lift is increased by 0.92.The performance curve of the model pump is smoother. The pressure pulsation intensity of the model pump is lower by 11.1 than that before the modification. (2) Axial force balance of the impeller: the model pump with 15 擄inclination at the outlet edge of the impeller is found to change the cover plate diameter. Reducing the diameter of the front cover plate can reduce the axial force of the impeller without affecting the hydraulic performance of the pump. Increasing the diameter of the back cover plate can also achieve the purpose of balancing axial force, but it will affect the flow state at the outlet of the impeller, and reduce the hydraulic performance of the model pump by a small margin. (3) after the modification of the radial positive guide vane: 15. It is found that the pressure pulsation intensity in the model pump can continue to be reduced by selecting the reasonable height of the positive vane blade with different height of the positive guide vane in the model pump. When the height coefficient of the positive guide blade is 0.6, the mean pressure pulsation intensity coefficient of each monitoring point is the lowest, which is 11.0% lower than that before modification. But decreasing the vane height of the positive guide vane will narrow the high efficiency area of centrifugal pump and decrease the diffusing capacity of the guide blade.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH311

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