Abstract:219%、105%和205%。The pressure fluctuation of turbulent flow, especially near the volute tongue in a double-suction centrifugal pump, is the primary reason of pump vibration and noise. This unsteady flow feature was investigated by large eddy simulation (LES) method with sliding mesh technology. The results showed that the blade passing frequency dominated the pressure fluctuations near the volute tongue at the design and large flow rate condition. At the small flow rate condition, the frequency which was lower than the blade passing frequency became dominative in the pressure fluctuations. The amplitude of the pressure fluctuation became higher when the flow rate was farer from the design flow rate. At the 62%, 80% and 120% of design flow rate conditions, the pressure fluctuation amplitudes were respectively 219%, 105% and 205% larger than the amplitude at design flow rate. |
Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.
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