Through-flow method is still widely applied in the revolution of the design of a turbomachinery, which can provide not merely the performance characteristic but also the flow field. In this study,a program based on th...Through-flow method is still widely applied in the revolution of the design of a turbomachinery, which can provide not merely the performance characteristic but also the flow field. In this study,a program based on the through-flow method was proposed, which had been verified by many other numerical examples. So as to improve the accuracy of the calculation, abundant loss and deviation models dependent on the real geometry of engine were put into use,such as: viscous losses,overflow in gaps, leakage from a flow path through seals. By means of this program, the aerodynamic performance of a certain high through-flow commercial fan/booster was investigated. On account of the radial distributions of the relevant parameters, flow deterioration in this machine was speculated. To confirm this surmise, 3-D numerical simulation was carried out with the help of the NUMECA software. Through detailed analysis, the speculation above was demonstrated, which provide sufficient evidence for the conclusion that the through-flow method is an essential and effective method for the performance prediction of the fan/booster.展开更多
As the dipoles of SSRF booster are powered in series, the magnet field error varies from magnet to magnet and results in bad beam quality. Sorting and installing magnets according to the measured field errors so that ...As the dipoles of SSRF booster are powered in series, the magnet field error varies from magnet to magnet and results in bad beam quality. Sorting and installing magnets according to the measured field errors so that the errors on different magnets are partially compensated with each other, has been the easiest way in many cases to reduce the detrimental effects of the errors without introducing complications. Based on the magnet field measurement results, we investigated and implemented the sorting of dipoles using a method mixed by local cancellation and simulated annealing, and it＇s found to be quite effective.展开更多
Aims In September 2012,Chinese scientists proposed a circular electron positron collider(CEPC)at 240 GeV center of mass for Higgs studies.The CEPC booster(CEPCB)provides 120 GeV electron and positron beams to the CEPC...Aims In September 2012,Chinese scientists proposed a circular electron positron collider(CEPC)at 240 GeV center of mass for Higgs studies.The CEPC booster(CEPCB)provides 120 GeV electron and positron beams to the CEPC collider.Methods The phase-shift-optimizing method is proposed and used in the CEPC booster design.We also explain the physics picture of this method,and then some numerical results are listed to confirm our idea.Result With the phase-shift-optimizing method,the dynamic aperture increases in varying degrees,especially for offmomentum particles.Conclusions In this paper,we find out the key point of CEPC booster lattice design.Using phase-shift-optimizing method,a CEPC booster lattice design with good dynamic aperture is given.展开更多
基金supported by National Natural Science Foundation of China(51236001)National Basic Research Program of China(2012CB720201)Beijing Natural Science Foundation(No.3151002)
文摘Through-flow method is still widely applied in the revolution of the design of a turbomachinery, which can provide not merely the performance characteristic but also the flow field. In this study,a program based on the through-flow method was proposed, which had been verified by many other numerical examples. So as to improve the accuracy of the calculation, abundant loss and deviation models dependent on the real geometry of engine were put into use,such as: viscous losses,overflow in gaps, leakage from a flow path through seals. By means of this program, the aerodynamic performance of a certain high through-flow commercial fan/booster was investigated. On account of the radial distributions of the relevant parameters, flow deterioration in this machine was speculated. To confirm this surmise, 3-D numerical simulation was carried out with the help of the NUMECA software. Through detailed analysis, the speculation above was demonstrated, which provide sufficient evidence for the conclusion that the through-flow method is an essential and effective method for the performance prediction of the fan/booster.
文摘As the dipoles of SSRF booster are powered in series, the magnet field error varies from magnet to magnet and results in bad beam quality. Sorting and installing magnets according to the measured field errors so that the errors on different magnets are partially compensated with each other, has been the easiest way in many cases to reduce the detrimental effects of the errors without introducing complications. Based on the magnet field measurement results, we investigated and implemented the sorting of dipoles using a method mixed by local cancellation and simulated annealing, and it＇s found to be quite effective.
基金This study was supported by National Key Programme for S&T Research and Development(Grant NO.:2016YFA0400400)National Natural Science Foundation of China(No.11575218 and No.11605211).
文摘Aims In September 2012,Chinese scientists proposed a circular electron positron collider(CEPC)at 240 GeV center of mass for Higgs studies.The CEPC booster(CEPCB)provides 120 GeV electron and positron beams to the CEPC collider.Methods The phase-shift-optimizing method is proposed and used in the CEPC booster design.We also explain the physics picture of this method,and then some numerical results are listed to confirm our idea.Result With the phase-shift-optimizing method,the dynamic aperture increases in varying degrees,especially for offmomentum particles.Conclusions In this paper,we find out the key point of CEPC booster lattice design.Using phase-shift-optimizing method,a CEPC booster lattice design with good dynamic aperture is given.
