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Design and Optimization of Auxiliary Backward-bladed Centrifugal Fans

Author: ZhangYu
Tutor: YueDanZuo
School: Dalian Maritime University
Course: Marine Engineering
Keywords: After curved blades Centrifugal fan Design Optimization
CLC: U664.5
Type: Master's thesis
Year: 2010
Downloads: 64
Quote: 0
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Abstract


Centrifugal fan with a wide range of applications in various fields of the national economy , is also one of the major energy-consuming equipment power consumption accounts for about 5% of the country's total generating capacity . Areas of the ship , the centrifugal fan . Two-stroke diesel engine start-up and low load operation , it is necessary to increase the intake pressure centrifugal blower , complete cylinder scavenging . Fan efficiency is generally not high , improve the efficiency of the centrifugal fan can not only save a lot of power , but also conducive to reduce fan geometry and material savings . In comparison with the other design methods , monohydric design method is simple , easy to grasp , to obtain a wide range of applications , but the design is not fully satisfactory results . In order to make up for the deficiencies of this method using CFD technology as a supplementary method to select the optimal design parameters . In this paper, a meta-design methods and the use of Flex to write a small desktop application for the preliminary design of the centrifugal fan . User to input the necessary parameters , the output the important geometric size of the fan . Application of this procedure , 8K90MC-C diesel engine design the auxiliary blower . Then GBT1236-2000, pipeline imports , the free export of C -type test device . The tests showed that the design fan static pressure reaches the design requirements , a maximum efficiency of 71.4% , basically meet the requirements of the fan performance . Two-dimensional numerical simulation of the blower fan optimization process . The unstructured triangular element grid and boundary layer mesh grid encrypt grid unit a total of 28,000 . The grid quality is good . Selected to calculate the fluid dynamics software Fluent MRF model and RNGκ-ε turbulence model . Comparison of simulation results with the experimental results , the total pressure error of 0.47% , and the error of the total pressure efficiency of 11.4% . Found to improve the size of the volute tongue , according to the results of the numerical simulation of fan efficiency of 6.6 % ; improved the volute lines draw method , the the fan volute dynamic pressure loss from 14.6% to 11.2% , and the efficiency of the fan has a certain improved.

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship machinery > Marine Auxiliary Machinery and equipment
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