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Optimization of the Impeller Geometry for an Automotive Torque Converter Using Response Surface Methodology and Desirability Function

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Document pages: 21 pages

Abstract: Responsesurface methodology (RSM) based on desirability function approach (DFA) isapplied to obtain an optimal design of the impeller geometry for an automotivetorque converter. The relative importance of six design parameters including impeller bladenumber, blade thickness, bias angle, scroll angle, inlet angle and exit angleis investigated using orthogonal design approach. The impeller inlet angle, exit angle and bias angle arefound to exert the greatest influence on the overall performance of atorque converter, with two flow area factors being considered, namely 17 and20 . Then, RSM together with central composite design (CCD) method is used toin-depth evaluate the interaction effect of the three key parameters onconverter performance. The results demonstrate that impeller exit angle hasthe strongest impact on peak efficiency, with larger angles yieldingthe most favorable results. The stall torque ratio maximization is attainablewith the increase of impeller bias angle and inlet angle together with smallerexit angle. In the end, an optimized design for the impeller geometryis obtained with stall torque ratio and peak efficiency increased by 1.62 and1.1 , respectively. The new optimization method can be used as a referencefor performance enhancement in the design process of impeller geometry for anautomotive torque converter.

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