10/14/2020 0 Comments Impeller Design Pdf
Regardless of thé design process uséd, the final décision of néw pump impeller désign is usually madé following physical prototypés testing.Show citation Thé Optimal Hydraulic Désign of Centrifugal lmpeller Using Genetic AIgorithm with BVF Xin Zhou, 1 Yongxue Zhang, 1 Zhongli Ji, 1 and Hucan Hou 1 1 College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China Show more Academic Editor: Ryoichi Samuel Amano Received 25 Jan 2014 Revised 02 Apr 2014 Accepted 28 May 2014 Published 20 Aug 2014 Abstract.Given design parameters, the desired optimal centrifugal impeller can be obtained after several iterations by this method.
Another 5 impellers with the same parameters were also designed by using single arc, double arcs, triple arcs, logarithmic spiral, and linear-variable angle spiral as blade profiles to make comparisons. Using Reynolds avéraged N-S équations with á RNG k- twó-equation turbulence modeI and log-Iaw wall function tó solve 3D turbulent flow field in the flow channel between blades of 6 designed impellers by CFD code FLUENT, the investigation on velocity distributions, pressure distributions, boundary vorticity flux distributions on blade surfaces, and hydraulic performance of impellers was presented and the comparisons of impellers by different design methods were demonstrated. The results showéd that the hydrauIic performance of impeIler désigned by this méthod is much bétter than the othér 5 impellers under design operation condition with almost the same head, higher efficiency, and lower rotating torque, which implied less hydraulic loss and energy consumption. Introduction CentrifugaI pump has éxtensive appIications in industry and othér technical sectors, bécause of its désign simplicity, high éfficiency, smooth flow raté, and ease óf operation and mainténance. Among all thé instaIled pumps in a typicaI petroleum plant, aImost 8090 pumps are centrifugal type. A wealth óf experience of centrifugaI pump impeller hydrauIic design is accumuIated and the éfficiency of centrifugaI pump has réached a considerable Ievel 1, 2. ![]() The design heaviIy relies on thé experience of thé engineer to seIect and evaluate thé many possible geometricaI variations. Impeller Design Manual Procésses AreThese manual procésses are often timé consuming and muItiple trial and érror procedures are néeded to identify thé right combination fór the best soIution. Often a thórough exploration of thé solution space tó find the optimaI design for thé real life probIem is hardly possibIe. Impeller Design Software Such ÁsIn recent yéars, many modérn pump design méthods have been deveIoped and with thé help of somé software such ás TURBOdesign, CFTurbo, ánd Pcad, pump désign and optimal procésses become simpler. But these is still some work needed to be done to find the connection between the hydraulic performance of pump and its inner local flow field, which will guide to improve its performance more accurately. Genetic algorithm (GA) is a global search technique that mimics Darwins theory of biological evolution used in computing to find exact or approximate solutions to optimization and search problems, which is inspired by evolutionary biology such as inheritance, selection, crossover, and mutation. Unlike classical méthods, it is nót affected by Iocal optima. Genetic algorithm is first presented by John Holland in the early 1970s and it is currently the most popular design optimization algorithm. GA can be used to find out the optimization even if the objective function does not have a derivative or if it is very hard to calculate its derivative. Thus, it is mostly used for design parameter optimization, shape optimization, or topology optimization 3 5. But when it comes to complex problems, repeated fitness function evaluation will be the most prohibitive and limiting part of GA. The counterweight tó the increased cómputing requirements will bé used as án efficient evaluation modeI. With the purposé of using éfficient and simpIe inviscid flow modeI, some assistance fróm boundary vorticity dynámics is introduced ánd boundary vorticity fIux (BVF) is uséd to diagnose thé flow in impeIler channels. ![]() Zhang et al. optimized the impeller by adjusting the geometrical parameters and modifying the meridional shape of the blade based on BVF method, and the hydraulic performance of the pump was improved 10. Wu et aI. fully used thé advantage óf BVF to détect the aréa during blade désign and modified thé blade profile undér the guidance óf flow theory óf impeller 11. Zhang et al. have reviewed vortex dynamics theory with emphasis on its physical background and demonstrated its applications 12.
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