Abstract
Response surface methodology (RSM) based on desirability function approach (DFA) is applied to obtain an optimal design of the impeller geometry for an automotive torque converter. The relative importance of six design parameters including impeller blade number, blade thickness, bias angle, scroll angle, inlet angle and exit angle is investigated using orthogonal design approach. The impeller inlet angle, exit angle and bias angle are found to exert the greatest influence on the overall performance of a torque converter, with two flow area factors being considered, namely 17% and 20%. Then, RSM together with central composite design (CCD) method is used to in-depth evaluate the interaction effect of the three key parameters on converter performance. The results demonstrate that impeller exit angle has the strongest impact on peak efficiency, with larger angles yielding the most favorable results. The stall torque ratio maximization is attainable with the increase of impeller bias angle and inlet angle together with smaller exit angle. In the end, an optimized design for the impeller geometry is obtained with stall torque ratio and peak efficiency increased by 1.62% and 1.1%, respectively. The new optimization method can be used as a reference for performance enhancement in the design process of impeller geometry for an automotive torque converter.
Highlights
IntroductionThe first technique is very effective at the wider range of vehicle speed, but not easy to obtain an optimized shape since a large number of design parameters are involved
The 11 geometric parameters can be represented by 6 design parameters including the impeller blade number z, blade thickness t, bias angle β, scroll angle γ, exit angle α1 and inlet angle α2
An L25[56] design of experiments (DOE) array has been successfully constructed for two responses including stall torque ratio and peak efficiency
Summary
The first technique is very effective at the wider range of vehicle speed, but not easy to obtain an optimized shape since a large number of design parameters are involved. The output torque and power of the engine is imparted to the transmission oil by the impeller of the torque converter. It is very important to understand the influence of impeller geometrical parameters on performance characteristics of a torque converter. This knowledge will greatly help designers to improve the torque converter performance
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
