Numerical simulation on the unsteady flow in a centrifugal compressor isperformed, and compared with the experimental data. The influence of the impeller-diffuserinteraction on the flow-fields is discussed, and the re...Numerical simulation on the unsteady flow in a centrifugal compressor isperformed, and compared with the experimental data. The influence of the impeller-diffuserinteraction on the flow-fields is discussed, and the reasons for the losses are also explored.Results show that qualitative and quite fair quantitative agreements are achieved between thepredicted and measured flowfields. The influence of the impeller wake on the convexity surface ofdiffuser is great. The potential repercussion of the diffuser on the suction surface of the impelleris much larger than on the pressure surface. Effect of the unsteady interaction is strongest in theradial gap. The unsteady flow itself may compensate for the loss generated in stage, and the stageefficiency is inversely proportional to the entropy production.展开更多
At present, with the rapid development of society and the increasing improvement of scientific and technological level, various undertakings have made breakthrough progress in the field of development. At the same tim...At present, with the rapid development of society and the increasing improvement of scientific and technological level, various undertakings have made breakthrough progress in the field of development. At the same time, it is also pushing our countrys economy towards more modernization. The function construction of grass-roots finance is an important part of national finance construction, which is mainly responsible for managing various financial revenues and expenditures and participating in tasks related to national economic construction. The internal construction and management control level of grass-roots finance are hot issues closely related to peoples livelihood. Therefore, strengthening the internal control and management of grass-roots financial funds is of vital importance and an important factor in maintaining the sustainable development of the country.展开更多
文摘Numerical simulation on the unsteady flow in a centrifugal compressor isperformed, and compared with the experimental data. The influence of the impeller-diffuserinteraction on the flow-fields is discussed, and the reasons for the losses are also explored.Results show that qualitative and quite fair quantitative agreements are achieved between thepredicted and measured flowfields. The influence of the impeller wake on the convexity surface ofdiffuser is great. The potential repercussion of the diffuser on the suction surface of the impelleris much larger than on the pressure surface. Effect of the unsteady interaction is strongest in theradial gap. The unsteady flow itself may compensate for the loss generated in stage, and the stageefficiency is inversely proportional to the entropy production.
文摘At present, with the rapid development of society and the increasing improvement of scientific and technological level, various undertakings have made breakthrough progress in the field of development. At the same time, it is also pushing our countrys economy towards more modernization. The function construction of grass-roots finance is an important part of national finance construction, which is mainly responsible for managing various financial revenues and expenditures and participating in tasks related to national economic construction. The internal construction and management control level of grass-roots finance are hot issues closely related to peoples livelihood. Therefore, strengthening the internal control and management of grass-roots financial funds is of vital importance and an important factor in maintaining the sustainable development of the country.
