Computational Fluid Dynamics(CFD)is used here to reduce pressure loss and improve heat exchange efficiency in the recuperator associated with a gas turbine.First,numerical simulations of the high-temperature and lowte...Computational Fluid Dynamics(CFD)is used here to reduce pressure loss and improve heat exchange efficiency in the recuperator associated with a gas turbine.First,numerical simulations of the high-temperature and lowtemperature channels are performed and,the calculated results are compared with experimental data(to verify the reliability of the numerical method).Second,the flow field structure of the low-temperature side channel is critically analyzed,leading to the conclusion that the flow velocity distribution in the low-temperature side channel is uneven,and its resistance is significantly higher than that in the high-temperature side.Therefore,five alternate structural schemes are proposed for the optimization of the low-temperature side.In particular,to reduce the flow velocity in the upper channel,the rib length of each channel at the inlet of the low-temperature side region is adjusted.The performances of the 5 schemes are compared,leading to the identification of the configuration able to guarantee a uniform flow rate and minimize the pressure drop.Finally,the heat transfer performance of the optimized recuperator structure is evaluated,and it is shown that the effectiveness of the recuperator is increased by 1.5%.展开更多
The results of computer simulation of segmented and cascaded thermoelectric generator modules are presented. That use of Bi2Te3-based materials as cold sections and PbTe-based materials as hot sections for two-section...The results of computer simulation of segmented and cascaded thermoelectric generator modules are presented. That use of Bi2Te3-based materials as cold sections and PbTe-based materials as hot sections for two-section modules in the temperature range 303-773 K, allows to multiply their efficiency by 1.28 as compared to single-section ones. Cascade structures are characterized by better efficiency and lesser output power compared with the sectional, although construction investigated modules are designed to the equal areas.展开更多
At the 40th Eureka World Invention Fair held in Brussels in 1991, the Ankan recuperator, a health product produced by the Sino-foreign funded Ankan Health Product Corporation, Ltd. in Tianjin, drew large crowd who suf...At the 40th Eureka World Invention Fair held in Brussels in 1991, the Ankan recuperator, a health product produced by the Sino-foreign funded Ankan Health Product Corporation, Ltd. in Tianjin, drew large crowd who suffered hypertension headaches, skin diseases and arthritis. One city council member joked, "I’ll try it once at the risk of my life." Surprised, within 30 minutes after being treated by the Ankan energy recuperator, the old man suffering from chronic neuritis raised his right arm. The pain was gone and an ulcer on the arm was basically healed. Many suffering from bronchitis, pulmonary emphasema, arthritis, shoulder pain and paralysis were cured. After inspection by the appraisal commission,展开更多
基金supported by the Scientific Problem Tackling Program of Science and Technology Commission of Shanghai Municipality(18DZ1202000)the Shanghai Local University Project“Research and Application of Key Technologies of New Efficient Micro Gas Turbine System”(No.19020500900).
文摘Computational Fluid Dynamics(CFD)is used here to reduce pressure loss and improve heat exchange efficiency in the recuperator associated with a gas turbine.First,numerical simulations of the high-temperature and lowtemperature channels are performed and,the calculated results are compared with experimental data(to verify the reliability of the numerical method).Second,the flow field structure of the low-temperature side channel is critically analyzed,leading to the conclusion that the flow velocity distribution in the low-temperature side channel is uneven,and its resistance is significantly higher than that in the high-temperature side.Therefore,five alternate structural schemes are proposed for the optimization of the low-temperature side.In particular,to reduce the flow velocity in the upper channel,the rib length of each channel at the inlet of the low-temperature side region is adjusted.The performances of the 5 schemes are compared,leading to the identification of the configuration able to guarantee a uniform flow rate and minimize the pressure drop.Finally,the heat transfer performance of the optimized recuperator structure is evaluated,and it is shown that the effectiveness of the recuperator is increased by 1.5%.
文摘The results of computer simulation of segmented and cascaded thermoelectric generator modules are presented. That use of Bi2Te3-based materials as cold sections and PbTe-based materials as hot sections for two-section modules in the temperature range 303-773 K, allows to multiply their efficiency by 1.28 as compared to single-section ones. Cascade structures are characterized by better efficiency and lesser output power compared with the sectional, although construction investigated modules are designed to the equal areas.
文摘At the 40th Eureka World Invention Fair held in Brussels in 1991, the Ankan recuperator, a health product produced by the Sino-foreign funded Ankan Health Product Corporation, Ltd. in Tianjin, drew large crowd who suffered hypertension headaches, skin diseases and arthritis. One city council member joked, "I’ll try it once at the risk of my life." Surprised, within 30 minutes after being treated by the Ankan energy recuperator, the old man suffering from chronic neuritis raised his right arm. The pain was gone and an ulcer on the arm was basically healed. Many suffering from bronchitis, pulmonary emphasema, arthritis, shoulder pain and paralysis were cured. After inspection by the appraisal commission,
