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Xie R.,Yangzhou University | Wu Z.,Jiangsu Water Conservancy Project | He Y.,Hydraulic Engineering Quality Supervision Station of Jiangsu Province | Tang F.,Yangzhou University | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2015

Based on the RNG k-ε turbulent model and Reynolds Navier-Stokes equation, the hydraulic performance of the bidirectional shaft tubular pump was simulated with the commercial CFD software. By comparing the hydraulic loss of each part, the results indicated that the hydraulic loss at the tail of the shaft tubular was large when the shaft tubular was used as inlet passage, and the hydraulic loss near the outlet of the vane and the bifurcation of the shaft tubular was also large when the shaft tubular was used as outlet passage. The hydraulic losses of the shaft tubular and straight passage were small when they were used as inlet passages due to the frictional head loss, but the hydraulic losses were large when they were used as outlet passages, with the effect of circulation and spread section, the flow was easy to be taken off, thus the hydraulic losses were large. The performance of the pump unit was improved compared with the original case, as the head loss was significantly reduced by adjusting the hull lines of the flow channel, and finally the hydraulic performance optimization design was finished. The efficiency of the simulation was up to 72.0% under positive condition, and it was up to 57.9% under reverse condition, the efficiency of the model test was up to 70.4% under positive condition, and it was up to 56.2% under reverse condition. ©, 2015, Chinese Society of Agricultural Machinery. All right reserved.


Yang X.,Nanjing Hydraulic Research Institute | He Y.,Jiangsu Water Conservancy Project | Wang W.,Jiangsu Water Conservancy Project | Chen W.,Nanjing Hydraulic Research Institute
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2013

In order to obtain the optimal combination of the tide and the wind in seadike design, two different concepts of independent risk and related risk were put forward. Based on these concepts and the theory of probability, a computational model of the two risks was defined and the relationship between the two risks was analyzed. Accordingly, a method for optimizing the two design parameters (tide and wind) was proposed. By applying the above-mentioned optimal design method to some case studies of Lianyungang, Sheyangzha, Tianshenggang in Jiangsu province, it is found that, because of different change tendency between tide and wind, the assumption that tide and wind adopt the same frequency is too conservative for design; the characteristics difference between tide and wind causes regional difference of the best combination of the two parameters; the present Jiangsu seadike design standard of the tide level for "the fifty-year return period encountering the 10th grade wind", from the perspective of optimal combination, can be further discussed regarding its rationality and safety. To ensure the seadike project's safety and economy in seadike designing, the coordination between the two types of risks should be taken into consideration. This optimal design method can also be applied in other similar water engineering designs.


Yang X.,Nanjing Hydraulic Research Institute | Zhu D.,Nanjing Hydraulic Research Institute | He Y.,Jiangsu Water Conservancy Project | Wang W.,Jiangsu Water Conservancy Project
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2013

Based on the grey neural network algorithm, the forecast model of the lock freight volume is established. The future lock freight volume is predicted by using the model. Comparing the computed volume with the statistic value in 2004~2007, it is found that the relative error is little, and the prediction is reasonable. Therefore, the forecast method based the grey neural network algorithm is recommended to be used in the waterway engineering.


Yang X.,Nanjing Hydraulic Research Institute | Huang J.,Nanjing Hydraulic Research Institute | He Y.,Jiangsu Water Conservancy Project | Wang W.,Jiangsu Water Conservancy Project | Chen W.,Nanjing Hydraulic Research Institute
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2014

In order to optimize the design of hydrological parameters for flood protection and drainage project in coast area, based on Gumbel-Hougaard Copula function and conditional probability theory, the correlation characteristics between high tidal level and low tidal level in the same tidal process line were analyzed, then a new method for design tide curve was proposed. Based on this method, considering three return period conditions (T=20, 50, 100, 200 a), the design types of tide were given at Lianyungang, Sheyangzha and Tianshenggang tide gauges in Jiangsu province as examples. Comparing with same multiple enlarging method and the improved same multiple enlarging method, the new method considers sufficiently the correlation characteristics between high tidal level and low tidal level, therefore, it is more perfect in theory; the tidal range from the new method is significantly larger than from other methods, and from a security standpoint, other methods have some design risks; the new method can also be extended to other similar design of combination of hydrological variables.

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