本文選題：離心泵 + 水力模型��； 參考：《沈陽航空航天大學》2014年碩士論文

【摘要】：隨著離心泵的應用范圍的增大和能源的短缺,離心泵的優(yōu)化設計越來越重要。目前,離心泵的優(yōu)化設計大都是以單目標優(yōu)化設計為主,沒有考慮到離心泵的綜合性能；很多優(yōu)化設計方法有自身的缺陷。本文以離心泵的效率、汽蝕性能和穩(wěn)定性為目標函數,以影響離心泵的主要幾何參數為自變量,考慮離心泵葉輪和蝸殼的最佳匹配關系,采用Matlab優(yōu)化工具箱中的遺傳算法進行了離心泵多目標優(yōu)化設計。采用Fluent分析軟件進行了數值模擬,并通過實驗證明了優(yōu)化方法和優(yōu)化結果的正確性和有效性。 本文闡述了計算流體力學(CFD)技術和離心泵優(yōu)化設計的國內外研究現狀和發(fā)展趨勢。 在考慮離心泵蝸殼和葉輪的最佳匹配關系情況下,以離心泵的效率、汽蝕性能和穩(wěn)定性為因變量,影響離心泵性能的主要幾何參數D2、β2、b2、D1、β1、b1、z、Y為設計變量,建立分目標函數,根據性能指標的重要程度,確定分目標函數的權重因子,通過線性加權的方法統一目標函數,根據經驗公式和企業(yè)生產要求確定合適的邊界條件,并采用Matlab工具箱中遺傳算法進行了優(yōu)化。 根據優(yōu)化結果,建立新的離心泵水力模型,采用UG軟件對優(yōu)化前后的離心泵流體區(qū)域進行三維建模,采用gambit軟件對流體區(qū)域進行網格劃分,然后導入fluent軟件中進行數值模擬。將優(yōu)化前后的流場進行對比分析,發(fā)現優(yōu)化后的葉片進口低壓區(qū)的壓力值高于優(yōu)化前的壓力值,流道中相對速度流線分布比優(yōu)化前的更合理,蝸殼出口處漩渦更小。 對優(yōu)化前后的結果進行了實驗分析。結果表明：在額定工況下,優(yōu)化后的離心泵效率比優(yōu)化前高5.03%,揚程低0.67m,揚程曲線更平緩,穩(wěn)定性更好,從而證明了優(yōu)化設計方法和數值模擬的正確性和有效性。
[Abstract]:With the enlargement of the application range of centrifugal pump and the shortage of energy, the optimization design of centrifugal pump is becoming more and more important. At present, the optimization design of centrifugal pump is mainly based on single objective optimization design, without considering the comprehensive performance of centrifugal pump; many optimization design methods have its own defects. This paper is based on the efficiency of centrifugal pump, cavitation performance and the performance of centrifugal pump. The stability is the objective function, which takes the main geometric parameters of the centrifugal pump as the independent variable and the optimum matching relation of the centrifugal pump impeller and the volute. The multi-objective optimization design of the centrifugal pump is carried out by using the genetic algorithm in the Matlab optimization toolbox. The numerical simulation is carried out with the Fluent analysis software, and the optimization method is proved by the experiment. The correctness and effectiveness of the results are optimized.
This paper describes the research status and development trend of computational fluid dynamics (CFD) technology and centrifugal pump optimization design at home and abroad.
Considering the optimal matching relationship between the centrifugal pump volute and the impeller, the main geometric parameters, D2, beta 2, B2, D1, beta 1, B1, Z, Y, are the main geometric parameters affecting the performance of centrifugal pump, with the efficiency of the centrifugal pump, the cavitation performance and stability as the dependent variable, and the objective function is established, and the weight factor of the objective function is determined by the importance of the performance index. The objective function is unified by the linear weighting method, and the appropriate boundary conditions are determined according to the empirical formula and the production requirements of the enterprise, and the genetic algorithm in the Matlab toolbox is used to optimize it.
According to the optimization results, a new centrifugal pump hydraulic model is set up. UG software is used to model the fluid region of the centrifugal pump before and after the optimization. Gambit software is used to mesh the fluid area. Then the numerical simulation is introduced into the FLUENT software. The flow field before and after the optimization is compared and analyzed, and the optimized blade inlet is found to be low. The pressure value in the pressure zone is higher than that before the optimization. The streamline distribution in the runner is more reasonable than that before the optimization, and the vortex at the outlet of the volute is smaller.
The results of the optimization have been tested and analyzed. The results show that the efficiency of the optimized centrifugal pump is 5.03% higher than that before the optimization, the lift is low 0.67M, the lift curve is more flat and the stability is better, which proves the correctness and effectiveness of the optimization design method and numerical simulation.
【學位授予單位】：沈陽航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH311

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本文編號：2097020