Abstract:Aiming at the problem of reverse flow which occurred under low flow rate in a low specific speed double suction centrifugal pump, the inner flow of pump and suction chambers were simulated, velocity analysis of fixed-points which was proposed to simulate probe-sampling system in experiment was used in reverse-flow research. After the statistics and analysis of velocity changes of fixed-point in the inlet of impeller in different flow rates, it was found that the curve got from simulation accord with the theory analysis and experimental curve in other literature. Based on the analysis of curve, reverse occur flow rate, reverse stable flow rate and reverse flow range were defined and explained. A new method which was used to predict the effective thickness of reverse flow field according to theory analysis was proposed. |
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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