基于正交試驗切線泵的優(yōu)化設計
發(fā)布時間：2019-03-20 11:34
【摘要】：切線泵具有流量~揚程曲線比較平坦、工作可靠等性能優(yōu)勢被廣泛應用于石油化工、航空航天、消防等領域,國內許多學者對切線泵的研究也從常規(guī)轉速向高轉速轉移,使得切線泵具有更加廣闊的應用范圍和領域。本文以切線泵WG211-10為研究對象,首先在泵試驗臺上對模型泵進行外特性試驗,記錄試驗數據并繪制外特性曲線圖,觀察曲線的變化情況,然后運用CFD技術對模型進行數值模擬,將模擬所得的結果和試驗數據進行對比分析,以驗證數值模擬策略的正確性。以此為基礎研究切線泵內流場的變化情況和關鍵幾何部件參數的變化對切線泵性能的影響;由于國內目前所生產的切線泵與國外先進水平在效率上有一定的差距,利用數值模擬和正交試驗的方法,對切線泵WG211-10進行優(yōu)化,以提高其效率;本文研究的主要內容如下:1、對模型泵WG211-10進行數值模擬,研究其內流場發(fā)現:觀察速度場可以看出在葉輪葉片流道內存在大量的漩渦,這是導致切線泵效率低的主要原因之一。2、通過改變不同喉部直徑研究喉部面積對切線泵性能的影響發(fā)現:喉部面積對切線泵的最大流量Q_max起決定性作用;喉部面積對切線泵的效率也有一定的影響,該泵型在喉部直徑取10mm時有較高的效率。3、流量系數是設計切線泵的主要參數之一,為了保證泵在運行時既要有較高的效率,又不超過截止流量,流量系數的取值應在0.75~0.8之間取值。4、葉輪葉片和蝸殼之間的間隙對切線泵的性能有一定的影響,分別選取1.2mm、1.8mm、3mm的間隙,研究發(fā)現間隙對切線泵的效率影響比較大,間隙越小,效率越高,考慮到軸在運轉過程中可能發(fā)生彎曲,間隙太小會使葉輪葉片和蝸殼相接觸,影響泵的正常運行,綜合考慮各方面因素間隙取2mm比較合適。5、綜合分析切線泵葉輪結構和蝸殼的主要幾何參數,選取葉輪外徑D_2、葉片出口寬度b_2、葉片傾角θ、蝸殼喉部直徑D_d為試驗因素進行正交試驗,得到的最優(yōu)方案為:b_2=9mm、θ=10.5°、D_d=9.6mm、D_2=126mm;將最終方案進行樣機制作,在泵試驗臺對樣機進行試驗,與原泵型的內流場和外特性曲線對比:在原泵型葉輪葉片之間的流道內存在著大量的漩渦,對該泵型優(yōu)化后,發(fā)現在葉輪葉片之間流道內漩渦消失或者漩渦面積減小;優(yōu)化泵樣機在設計工況點的揚程為223m,比原泵型的揚程高2m,優(yōu)化泵的效率為43.3%,比原泵型模擬效率提高了1.3%,軸功率為14.4k W,比原泵型軸功率低0.58k W,達到了優(yōu)化設計的目的。
[Abstract]:Tangent pump is widely used in petrochemical, aerospace, fire protection and other fields because of its smooth flow-head curve and reliable operation. Many domestic scholars have also transferred the research of tangential pump from conventional speed to high speed, and so on, and it has been widely used in many fields such as petrochemical industry, aeronautics and aerospace, fire protection and so on. So that the tangent pump has a wider range of applications and fields. In this paper, the tangential pump WG211-10 is taken as the research object. Firstly, the external characteristic test of the model pump is carried out on the pump test-bed, the test data are recorded and the curves of the external characteristics are drawn, and the change of the curve is observed. Then the CFD technology is used to simulate the model, and the simulation results are compared with the experimental data to verify the correctness of the numerical simulation strategy. Based on this, the influence of the variation of the flow field in the tangential pump and the parameters of the key geometric components on the performance of the tangential pump is studied. Because there is a certain gap in efficiency between the tangential pump produced in China and the advanced level in foreign countries, the WG211-10 of tangential pump is optimized by numerical simulation and orthogonal test to improve its efficiency. The main contents of this paper are as follows: 1. The numerical simulation of the model pump WG211-10 is carried out and the internal flow field is studied. It is found that there are a large number of swirls in the impeller vane passage when the velocity field is observed. This is one of the main reasons leading to the low efficiency of tangential pump. 2, the influence of throat area on the performance of tangential pump is studied by changing the diameter of different larynx. It is found that the throat area plays a decisive role in the maximum flow rate Q_max of tangential pump; The throat area also has a certain effect on the efficiency of the tangential pump, which has a high efficiency when the throat diameter is 10mm. 3. The flow coefficient is one of the main parameters in the design of the tangential pump, in order to ensure that the pump has high efficiency in operation, 4. The clearance between impeller vane and volute has a certain effect on the performance of tangential pump, and the clearance of 1.2 mm, 1.8 mm, 3 mm, respectively, should be between 0.75 and 0.8, respectively, and the cut-off flow rate should not exceed the cut-off flow, and the value of flow coefficient should be between 0.75 and 0.8. 4. It is found that clearance has a greater effect on the efficiency of tangential pump, and the smaller the clearance, the higher the efficiency. Considering that the shaft may bend in the course of operation, too small clearance will contact the impeller vane and volute and affect the normal operation of the pump. It is more suitable to take 2mm for consideration of various factors. 5. The main geometric parameters of impeller structure and volute of tangent pump are comprehensively analyzed, and the external diameter of impeller, the width of blade outlet, the angle 胃 of blade, the external diameter of impeller, the width of blade outlet, and the angle 胃 of blade are selected. The orthogonal experiment was carried out on the throat diameter of volute. The optimum scheme was as follows: b ~ 2 ~ (2) ~ 9 mm, 胃 = 10.5 擄, D ~ (?) = 9.6 mm, D ~ (2) ~ (126) mm, and D ~ (2) 脳 10 ~ (- 1) mm, (P < 0.05). Compared with the inner flow field and external characteristic curve of the original pump type, the final scheme was manufactured and tested on the pump test bed. There are a lot of whirlpool in the channel between the impeller blades of the original pump type, and after the optimization of the pump type, the flow field and the external characteristic curve of the original pump type are compared with those of the original pump type. It was found that the vortex disappeared or the vortex area decreased in the passage between the impeller blades. The head of the optimized pump is 223m, 2 m higher than that of the original pump, the efficiency of the optimized pump is 43.3%, the efficiency of the optimized pump is 1.3% higher than that of the original pump, the shaft power is 14.4kW, and the shaft power is 0.58kW lower than that of the original pump. The optimization design is achieved.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH38
本文編號：2444175
[Abstract]:Tangent pump is widely used in petrochemical, aerospace, fire protection and other fields because of its smooth flow-head curve and reliable operation. Many domestic scholars have also transferred the research of tangential pump from conventional speed to high speed, and so on, and it has been widely used in many fields such as petrochemical industry, aeronautics and aerospace, fire protection and so on. So that the tangent pump has a wider range of applications and fields. In this paper, the tangential pump WG211-10 is taken as the research object. Firstly, the external characteristic test of the model pump is carried out on the pump test-bed, the test data are recorded and the curves of the external characteristics are drawn, and the change of the curve is observed. Then the CFD technology is used to simulate the model, and the simulation results are compared with the experimental data to verify the correctness of the numerical simulation strategy. Based on this, the influence of the variation of the flow field in the tangential pump and the parameters of the key geometric components on the performance of the tangential pump is studied. Because there is a certain gap in efficiency between the tangential pump produced in China and the advanced level in foreign countries, the WG211-10 of tangential pump is optimized by numerical simulation and orthogonal test to improve its efficiency. The main contents of this paper are as follows: 1. The numerical simulation of the model pump WG211-10 is carried out and the internal flow field is studied. It is found that there are a large number of swirls in the impeller vane passage when the velocity field is observed. This is one of the main reasons leading to the low efficiency of tangential pump. 2, the influence of throat area on the performance of tangential pump is studied by changing the diameter of different larynx. It is found that the throat area plays a decisive role in the maximum flow rate Q_max of tangential pump; The throat area also has a certain effect on the efficiency of the tangential pump, which has a high efficiency when the throat diameter is 10mm. 3. The flow coefficient is one of the main parameters in the design of the tangential pump, in order to ensure that the pump has high efficiency in operation, 4. The clearance between impeller vane and volute has a certain effect on the performance of tangential pump, and the clearance of 1.2 mm, 1.8 mm, 3 mm, respectively, should be between 0.75 and 0.8, respectively, and the cut-off flow rate should not exceed the cut-off flow, and the value of flow coefficient should be between 0.75 and 0.8. 4. It is found that clearance has a greater effect on the efficiency of tangential pump, and the smaller the clearance, the higher the efficiency. Considering that the shaft may bend in the course of operation, too small clearance will contact the impeller vane and volute and affect the normal operation of the pump. It is more suitable to take 2mm for consideration of various factors. 5. The main geometric parameters of impeller structure and volute of tangent pump are comprehensively analyzed, and the external diameter of impeller, the width of blade outlet, the angle 胃 of blade, the external diameter of impeller, the width of blade outlet, and the angle 胃 of blade are selected. The orthogonal experiment was carried out on the throat diameter of volute. The optimum scheme was as follows: b ~ 2 ~ (2) ~ 9 mm, 胃 = 10.5 擄, D ~ (?) = 9.6 mm, D ~ (2) ~ (126) mm, and D ~ (2) 脳 10 ~ (- 1) mm, (P < 0.05). Compared with the inner flow field and external characteristic curve of the original pump type, the final scheme was manufactured and tested on the pump test bed. There are a lot of whirlpool in the channel between the impeller blades of the original pump type, and after the optimization of the pump type, the flow field and the external characteristic curve of the original pump type are compared with those of the original pump type. It was found that the vortex disappeared or the vortex area decreased in the passage between the impeller blades. The head of the optimized pump is 223m, 2 m higher than that of the original pump, the efficiency of the optimized pump is 43.3%, the efficiency of the optimized pump is 1.3% higher than that of the original pump, the shaft power is 14.4kW, and the shaft power is 0.58kW lower than that of the original pump. The optimization design is achieved.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH38
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