Hydraulic valve block is an important part of the hydraulic system.The traditional hydraulic valve block is made by turning and milling,drilling and boring,which leads to many right-angle bending and closed cavity str...Hydraulic valve block is an important part of the hydraulic system.The traditional hydraulic valve block is made by turning and milling,drilling and boring,which leads to many right-angle bending and closed cavity structure of process holes in its internal flow channel,seriously affecting the flow performance of oil.Based on the new design space provided by additive manufacturing technology,the internal hydraulic flow channel of valve block is optimized by using B-spline curve.Computational fluid dynamics analysis is carried out on the hydraulic flow channel to determine the optimal flow channel structure with the smallest pressure drop.The weight reduction of hydraulic valve block is carried out through topology optimization.According to the results of topology optimization,using the method of selective laser melting(SLM),the printing of the hydraulic valve block is completed.The optimized hydraulic channel reduces the pressure loss by 31.4%compared with the traditional hydraulic channel.Compared with the traditional valve block,the hydraulic valve block manufactured by SLM with topology optimization reduces the weight by 33.9%.Therefore,the proposed flow channel optimization and valve block lightweight method provide a new reference for the performance improvement of the internal flow channel of hydraulic valve block and the overall lightweight design of valve block.展开更多
To address the issues of overheating and uneven temperature distribution in large battery packs during high-rate rapid discharge,this study optimized the channel structure of liquid cooling plates(LCPs).Based on the b...To address the issues of overheating and uneven temperature distribution in large battery packs during high-rate rapid discharge,this study optimized the channel structure of liquid cooling plates(LCPs).Based on the bionic fishbone structure,referred to as D1,three enhanced flow channel configurations,named D2 to D4,were developed by transforming the conventional straight main tubes into serpentine channels.Numerical simulation results revealed that,compared with the LCP with D1,the LCP with D2,featuring three serpentine main pipes,achieved superior thermo-hydraulic performances,with an average heat transfer coefficient increased by 44.05%,and its maximum temperature and maximum temperature difference reduced by 1.5℃and 1.4℃,respectively.However,the increase in the flow resistance of the solution was the largest,reaching 47.21%.The LCP with the dual-serpentine D3 configuration showed more moderate improvements,while the LCP with the single-serpentine D4 variant performed the least effectively.Based on the LCPs with D1 to D3,the LCPs with D5 to D8 were designed by reducing the branches and non-uniform branch distribution to decrease the flow resistance of the coolant.The findings demonstrated that decreasing the number of branches effectively reduced the coolant flow resistance,whereas the asymmetric branch arrangements enhanced the LCP temperature uniformity.The LCP with D6 configuration emerged as offering an optimal performance balance,achieving a 21.88%higher heat transfer coefficient and 12.73%lower flow resistance.Notably,the LCP with the D8 design attained a significant 35.86%resistance reduction while maintaining a 12.21%thermal performance improvement through its innovative nonuniform branch distribution.Furthermore,the influence of the solution mass flow rate on the thermal hydraulic performance of LCPs with different structures was studied.The results showed that increasing coolant flow rate was not a suitable strategy for enhancing the performance of serpentine main pipe in LCPs.展开更多
基金supported by the National Natural Science Foundation of China(No.51775273)the Jiangsu Province Science and Technology Support Plan Project(No.BE2018010-2)+2 种基金the National Defence Basic Scientific Research Program of China(No.JCKY2018605C010)the Frontiers of Science and Technology Program of China (No.1816312ZT00406301)the Aeronautical Science Foundation of China(No.2020Z049052002)
文摘Hydraulic valve block is an important part of the hydraulic system.The traditional hydraulic valve block is made by turning and milling,drilling and boring,which leads to many right-angle bending and closed cavity structure of process holes in its internal flow channel,seriously affecting the flow performance of oil.Based on the new design space provided by additive manufacturing technology,the internal hydraulic flow channel of valve block is optimized by using B-spline curve.Computational fluid dynamics analysis is carried out on the hydraulic flow channel to determine the optimal flow channel structure with the smallest pressure drop.The weight reduction of hydraulic valve block is carried out through topology optimization.According to the results of topology optimization,using the method of selective laser melting(SLM),the printing of the hydraulic valve block is completed.The optimized hydraulic channel reduces the pressure loss by 31.4%compared with the traditional hydraulic channel.Compared with the traditional valve block,the hydraulic valve block manufactured by SLM with topology optimization reduces the weight by 33.9%.Therefore,the proposed flow channel optimization and valve block lightweight method provide a new reference for the performance improvement of the internal flow channel of hydraulic valve block and the overall lightweight design of valve block.
基金supported by the Natural Science Foundation of Hunan Province,China(Project Nos.2025JJ70047 and 2022JJ50081).
文摘To address the issues of overheating and uneven temperature distribution in large battery packs during high-rate rapid discharge,this study optimized the channel structure of liquid cooling plates(LCPs).Based on the bionic fishbone structure,referred to as D1,three enhanced flow channel configurations,named D2 to D4,were developed by transforming the conventional straight main tubes into serpentine channels.Numerical simulation results revealed that,compared with the LCP with D1,the LCP with D2,featuring three serpentine main pipes,achieved superior thermo-hydraulic performances,with an average heat transfer coefficient increased by 44.05%,and its maximum temperature and maximum temperature difference reduced by 1.5℃and 1.4℃,respectively.However,the increase in the flow resistance of the solution was the largest,reaching 47.21%.The LCP with the dual-serpentine D3 configuration showed more moderate improvements,while the LCP with the single-serpentine D4 variant performed the least effectively.Based on the LCPs with D1 to D3,the LCPs with D5 to D8 were designed by reducing the branches and non-uniform branch distribution to decrease the flow resistance of the coolant.The findings demonstrated that decreasing the number of branches effectively reduced the coolant flow resistance,whereas the asymmetric branch arrangements enhanced the LCP temperature uniformity.The LCP with D6 configuration emerged as offering an optimal performance balance,achieving a 21.88%higher heat transfer coefficient and 12.73%lower flow resistance.Notably,the LCP with the D8 design attained a significant 35.86%resistance reduction while maintaining a 12.21%thermal performance improvement through its innovative nonuniform branch distribution.Furthermore,the influence of the solution mass flow rate on the thermal hydraulic performance of LCPs with different structures was studied.The results showed that increasing coolant flow rate was not a suitable strategy for enhancing the performance of serpentine main pipe in LCPs.
