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Ding Nan,Toru Shigemitsu,Shengdun Zhao,Yasutoshi Takeshima 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.4
Small hydropower generation is one of important alternative energy, and potential of small hydropower is great. Efficiency of small hydro-turbine is lower than that of large one, and these small hydro-turbine’s common problems are out of operation by foreign materials. Therefore, we adopted contra-rotating rotors, which can be expected to achieve high performance and enable to use low-solidity rotors to achieve stable operation. Experimental apparatus of the contra-rotating small hydro-turbine with 60mm casing diameter was manufactured and some experiments were conducted. In this research, the internal flow with foreign vegetable materials, i.e. leaves and grasses, were investigated by a high speed camera, and the performance experiments when two pieces of cudweeds were attached on the blade of front rotor were conducted. As the results shown, the passing rate of small leaves is 41.2% and all of the middle leaves can’t pass through the contra-rotating small hydro-turbine. The highest efficiency also decreased about 13%, reaching to 51.2% at 1.4Qd, because of the foreign vegetable materials.
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Design and theoretical analysis of a sliding valve distribution radial piston pump
Guo Tong,Zhao Shengdun,Yu Yanghuiwen,Shang Peng 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1
A Sliding valve distribution radial piston pump (SVDRPP) is presented. In this pump, a new distribution method that uses slidingvalves to distribute oil for the piston chambers is developed. With this design, the disadvantages brought by the distribution shaft and thecheck valves (traditional distribution mechanisms), such as the poor stress state of the shaft and the energy waste for opening the checkvalves, are expected to be eliminated. In addition, a method of using pressure oil to accomplish the returning stroke of the piston is alsoproposed, which could be used to replace the usage of springs along with their shortcomings. A pump with five pistons is designed as anexample to elaborate the structure and the working principle of SVDRPP. Furthermore, the flow characteristics of SVDRPP are studied,and the formulas of the displacement, the average flow rate and the instantaneous flow rate are deduced.
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Numerical Analysis of Contra-Rotating Small Hydro-Turbine with Cylinder Spoke
Ding Nan,Toru Shigemitsu,Shengdun Zhao,Yasutoshi Takeshima 한국유체기계학회 2018 International journal of fluid machinery and syste Vol.11 No.1
Small hydropower is one of potential energy resource existing in our living environment and yet not been widely used. Small hydro-turbine is suitable in these energy resources while it still has some shortages, like performing low efficiency and easy to be out of control when there are foreign materials in the water. Thus we designed this contra-rotating small hydro-turbine to increase its efficiency and enhance its ability of keeping stable operation. The experimental apparatus was designed and assembled, and some experiments were conducted. A new kind of cylinder spoke, which supports the front and rear rotor, was adopted and the numerical analysis was carried out in this paper. As the numerical analysis results shown, the efficiency of test turbine with cylinder spoke increased in a wide range of flow rate. The maximum efficiency increased about 2.2%, reaching to 66.4%, and it was obtained at 1.25Qd. The internal flow condition, especially at the areas behind the spoke, was improved by the cylinder spoke.
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Nan, Ding,Shigemitsu, Toru,Zhao, Shengdun,Takeshima, Yasutoshi Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.4
Small hydropower generation is one of important alternative energy, and potential of small hydropower is great. Efficiency of small hydro-turbine is lower than that of large one, and these small hydro-turbine's common problems are out of operation by foreign materials. Therefore, we adopted contra-rotating rotors, which can be expected to achieve high performance and enable to use low-solidity rotors to achieve stable operation. Experimental apparatus of the contra-rotating small hydro-turbine with 60mm casing diameter was manufactured and some experiments were conducted. In this research, the internal flow with foreign vegetable materials, i.e. leaves and grasses, were investigated by a high speed camera, and the performance experiments when two pieces of cudweeds were attached on the blade of front rotor were conducted. As the results shown, the passing rate of small leaves is 41.2% and all of the middle leaves can't pass through the contra-rotating small hydro-turbine. The highest efficiency also decreased about 13%, reaching to 51.2% at $1.4Q_d$, because of the foreign vegetable materials.
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Numerical Analysis of Contra-Rotating Small Hydro-Turbine with Cylinder Spoke
Nan, Ding,Shigemitsu, Toru,Zhao, Shengdun,Takeshima, Yasutoshi Korean Society for Fluid machinery 2018 International journal of fluid machinery and syste Vol.11 No.1
Small hydropower is one of potential energy resource existing in our living environment and yet not been widely used. Small hydro-turbine is suitable in these energy resources while it still has some shortages, like performing low efficiency and easy to be out of control when there are foreign materials in the water. Thus we designed this contra-rotating small hydro-turbine to increase its efficiency and enhance its ability of keeping stable operation. The experimental apparatus was designed and assembled, and some experiments were conducted. A new kind of cylinder spoke, which supports the front and rear rotor, was adopted and the numerical analysis was carried out in this paper. As the numerical analysis results shown, the efficiency of test turbine with cylinder spoke increased in a wide range of flow rate. The maximum efficiency increased about 2.2%, reaching to 66.4%, and it was obtained at $1.25Q_d$. The internal flow condition, especially at the areas behind the spoke, was improved by the cylinder spoke.
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Performance analysis of embedded tri-screw pump based on computational fluid dynamics
Yongqiang Zhao,Bowen Zhu,Hongling Hou,Shengdun Zhao 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.2
To meet the stringent size and noise requirements for hydraulic pumps used in submarines, an embedded tri-screw pump is proposed. The pump is embedded in the core of the servo motor to form a new servo motor pump. This paper first presents the embedded triscrew pump, as well as the cross-section profile design and parameter equations of the driving and driven screws. Velocity and pressure field distributions as well as changes in internal pressure and shear stress inside the embedded tri-screw pump with different radial and interlobe clearances were investigated using computational fluid dynamics. Furthermore, screw deformation under multi-field coupling was analyzed. In contrast to torque or fluid pressure acting alone, under the fluid-solid coupling effect, screw deformation and stresses are inversely proportional to the rotational speed of the pump and directly proportional to the power and output pressure. The simulation and experimental results were consistent for various outlet pressures and rotational speeds. Radial clearance of the screw has a more significant influence on leakage than inter-lobe clearance and therefore, more impact on the volumetric efficiency of the pump.
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