Internal Flow Condition of Fluid Food Pump Using Semi-Open Impeller

2015 ◽  
Author(s):  
Toru Shigemitsu ◽  
Hirotaka Shinohara ◽  
Takumi Matsubara ◽  
Junichiro Fukutomi
Keyword(s):  
Numerical Analysis ◽  
Flow Condition ◽  
Design Method ◽  
Internal Flow ◽  
Axial Position ◽  
Flow Conditions ◽  
Flow Passage ◽  
Flow Phenomena ◽  
Turbo Pump

Fluid machineries for fluid food have been used in wide variety of field i.e. transportation, filling, and improvement of quality of fluid food. Although, flow conditions of these are quite complicated because fluid food is different from water. Therefore, a design method based on the internal flow conditions is not conducted. In this research, turbo-pump having small number of blade was used to decrease shear loss and keep wide flow passage. The flow phenomena were not clarified in detail, although, it was found that internal flow condition was complex in the test pump in previous studies. In order to investigate the complex internal flow condition, the unsteady numerical analysis using low viscous fluid was conducted. In this paper, the internal flow conditions at each axial position of the centrifugal pump having semi-open impeller were investigated by the numerical analysis results. In addition to that, the influence of the internal flow conditions on its head was clarified.

Performance and Internal Flow of Contra-Rotating Small Hydro Turbine

2013 ◽  
Author(s):  
Toru Shigemitsu ◽  
Junichiro Fukutomi ◽  
Ryosuke Sonohata
Keyword(s):  
Flow Condition ◽  
Alternative Energy ◽  
High Performance ◽  
Internal Flow ◽  
Stable Operation ◽  
Small Hydropower ◽  
Flow Passage ◽  
Hydro Turbine ◽  
Experimental Apparatus ◽  
Hydro Turbines

Small hydropower generation is one of important alternative energy, and potential of small hydropower is great. Efficiency of small hydro turbines is lower than that of large one, and these small hydro turbine’s common problems are out of operation by foreign materials. Then, there are demands for small hydro turbines to keep high performance and wide flow passage. Therefore, we adopted contra-rotating rotors, which can be expected to achieve high performance and enable to use low-solidity rotors with wide flow passage, in order to accomplish high performance and stable operation. Final goal of this study is development of a small hydro turbine like electrical goods, which has high portability and makes an effective use of unused small hydro power energy source. In this research, experimental apparatus of the contra-rotating small hydro turbine with 60mm casing diameter was manufactured and performance of it was investigated by an experiment. Efficiency of the contra-rotating small hydro turbine was high in pico-hydro turbine and high efficiency could be kept in wide flow rate range. Internal flow condition, which was difficult to measure experimentally, was shown by the numerical flow analysis. Further, influence of spokes to support the rotor was clarified. Then, a relation between the performance and internal flow condition was considered by the experimental and numerical analysis results.

705 Numerical Analysis of Complex Vortical Flow Phenomena in Transonic Internal Flow Fields

2001 ◽  
Vol 2001 (0) ◽  
pp. 97
Author(s):  
Masato FURUKAWA ◽  
Kazutoyo YAMADA ◽  
Aritoshi IMAZATO ◽  
Masahiro INOUE
Keyword(s):  
Numerical Analysis ◽  
Internal Flow ◽  
Flow Fields ◽  
Vortical Flow ◽  
Flow Phenomena

The Flow Phenomena and the Non-Uniform Filling of the Unvulcanized Rubber in Process of Filling

2009 ◽  
Author(s):  
Shintarou Sakai ◽  
Toru Shigemitsu ◽  
Junichiro Fukutomi ◽  
Tsukasa Matsuoka
Keyword(s):  
Numerical Analysis ◽  
Narrow Channel ◽  
Numerical Results ◽  
Flow Conditions ◽  
Flow Phenomena ◽  
Rubber Product ◽  
Vulcanization Process ◽  
Filling State ◽  
Optimum Flow ◽  
Good Agreement

Rubber products like oil seal are produced by vulcanization molding and the vulcanization molding of rubber product is performed by past experience, trial and error. It is important issues to decrease the product cost, reduce defective products and solve the environmental problems by saving natural resources. If the vulcanization moldings of rubber products are reappeared by computer simulation, it is very useful and it could contribute to solve the above problems. In order to reduce surplus rubber and defective products, numerical analysis of flow phenomena of unvulcanized rubber was performed using commercial software FIDAP. In several types of rubber mold model, the numerical analysis was conducted taken the characteristic of visco-elasticity fluid obtained by an experiment without considering the effect of heat. And experiments were conducted for the comparison of numerical results and actual phenomena. In the experiment, vulcanization process was stopped by arbitrary interval. Then the filling state and the shape of the rubber at each interval are observed in numerical and experiment results. The results showed that the filling state of numerical results represented good agreement with the experimental results. And it was clarified from the numerical analysis that shear stress increased when the unvulcanized rubber flowed in a narrow channel and there was the relation between pressure and velocity. In the present paper, the flow phenomena under the condition of the compression molding are shown and the optimum flow conditions are discussed from the numerical results. Furthermore mechanism of occurrence of defective products is considered with the experimental and the numerical results.

The effect of blade outlet angle on performance and internal flow condition of mini turbo-pump

2011 ◽  
Vol 20 (1) ◽  
pp. 32-38 ◽  
Author(s):  
T. Shigemitsu ◽  
J. Fukutomi ◽  
R. Nasada ◽  
K. Kaji
Keyword(s):  
Flow Condition ◽  
Internal Flow ◽  
Outlet Angle ◽  
Turbo Pump

Inverse Design of Centrifugal Compressor Vaned Diffusers in Inlet Shear Flows

1996 ◽  
Vol 118 (2) ◽  
pp. 385-393 ◽  
Author(s):  
M. Zangeneh
Keyword(s):  
Flow Field ◽  
Centrifugal Compressor ◽  
Design Method ◽  
Three Dimensional ◽  
Internal Flow ◽  
Inviscid Flow ◽  
Inverse Design ◽  
Flow Conditions ◽  
Inlet Flow ◽  
Blade Thickness

A three-dimensional inverse design method in which the blade (or vane) geometry is designed for specified distributions of circulation and blade thickness is applied to the design of centrifugal compressor vaned diffusers. Two generic diffusers are designed, one with uniform inlet flow (equivalent to a conventional design) and the other with a sheared inlet flow. The inlet shear flow effects are modeled in the design method by using the so-called “Secondary Flow Approximation” in which the Bernoulli surfaces are convected by the tangentially mean inviscid flow field. The difference between the vane geometry of the uniform inlet flow and nonuniform inlet flow diffusers is found to be most significant from 50 percent chord to the trailing edge region. The flows through both diffusers are computed by using Denton’s three-dimensional inviscid Euler solver and Dawes’ three-dimensional Navier–Stokes solver under sheared in-flow conditions. The predictions indicate improved pressure recovery and internal flow field for the diffuser designed for shear inlet flow conditions.

A Design Method of Aero Fuel Centrifugal Pump with Integrated Inducer and Impeller

2014 ◽  
Vol 680 ◽  
pp. 303-306
Author(s):  
Jia Li ◽  
Hua Cong Li ◽  
Jiang Feng Fu ◽  
Shu Hong Wang
Keyword(s):  
Centrifugal Pump ◽  
Simulation Analysis ◽  
Design Method ◽  
Internal Flow ◽  
Field Performance ◽  
Simulation Method ◽  
Hybrid Network ◽  
Control Technique ◽  
Pressure Side ◽  
Flow Conditions

With the development of the aero engine control technique, aero fuel centrifugal pump with integrated inducer and impeller meet the requirements better than the divided pump. This paper established the hybrid network of the centrifugal pump which adopted multi-block topology structure and octree format, analyzed the internal flow field performance of the pump based on numerical simulation. The simulation datas compared with test datas show that under different calculation conditions, head error of the simulation data and experimental data is less than 1%, and the efficiency value of error is less than 5%. The simulation method can accurately calculate the performance of the pump. The simulation analysis shows that the asymmetry of the impeller internal pressure is appreciable under different flow conditions because of the inlet length, under other small flow conditions. The most dramatic change is the pressure in the impeller channel, and the pressure under large flow conditions is lower than that under other flow conditions. In fixed location of the pressure side, there may produce low speed flow group, the situation is the same as in the entrance to the attachment of back pressure side.

scholarly journals Novel Method of the Seal Aerodynamic Design to Reduce Leakage by Matching the Seal Geometry to Flow Conditions

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7880
Author(s):  
Damian Joachimiak
Keyword(s):  
Kinetic Energy ◽  
Design Method ◽  
Pressure Ratio ◽  
Leakage Rate ◽  
Relative Reduction ◽  
Flow Conditions ◽  
Labyrinth Seals ◽  
Flow Phenomena ◽  
Novel Method ◽  
Carry Over

This paper presents a novel method of labyrinth seals design. This method is based on CFD calculations and consists in the analysis of the phenomenon of gas kinetic energy carry-over in the seal chambers between clearances. The design method is presented in two variants. The first variant is designed for seals for which it is impossible to change their external dimensions (length and height). The second variant enables designing the seal geometry without changing the seal length and with a slight change of the seal height. Apart from the optimal distribution of teeth, this variant provides for adjusting chambers geometry to flow conditions. As the result of using both variants such design of the seal geometry with respect to leakage is obtained which enables achieving kinetic energy dissipation as uniform as possible in each chamber of the seal. The method was developed based on numerical calculations and the analysis of the flow phenomena. Calculation examples included in this paper show that the obtained reduction of leakage for the first variant ranges from 3.4% to 15.5%, when compared with the initial geometry. The relation between the number of seal teeth and the leakage rate is also analyzed here. The second variant allows for reduction of leakage rate by 15.4%, when compared with the geometry with the same number of teeth. It is shown that the newly designed geometry reveals almost stable relative reduction of leakage rate irrespective of the pressure ratio upstream and downstream the seal. The efficiency of the used method is proved for various heights of the seal clearance.

Study on Performance and Internal Flow Condition of Mini Turbo-Pump

2010 ◽  
Author(s):  
Toru Shigemitsu ◽  
Junichiro Fukutomi ◽  
Ryoichi Nasada ◽  
M. A. Wahid ◽  
S. Samion ◽  
...  
Keyword(s):  
Flow Condition ◽  
Internal Flow ◽  
Turbo Pump

Influence of Meridian Shape on Screw-Type Centrifugal Pump Performance

2002 ◽  
Author(s):  
Yasushi Tatebayashi ◽  
Kazuhiro Tanaka
Keyword(s):  
Centrifugal Pump ◽  
Design Method ◽  
Internal Flow ◽  
Generation System ◽  
Flow Passage ◽  
Back Flow ◽  
Pump Performance ◽  
Pressure Surface ◽  
Pressure Distributions ◽  
Complicated Configuration

A screw-type centrifugal pump with a wide flow passage has been widely used for drainage of rainwater as well as slurries and mud to avoid the flow passage blockage with the congestion of solids. Due to the complicated configuration of this pump, the design method of this pump has not been established yet. The authors succeeded in predicting the internal flow numerically by using our own grid-generation system and a commercial 3-D N-S code, TASCflow, as a solver. In this study, the internal flow has been predicted numerically at the design point on the five impellers with different hub cone shapes in order to clarify the influence of meridian shape on the pump performance. In particular, the relationships among the pump characteristics, the back flow at the blade pressure surface and the back flow from the volute casing to the impeller exit have been discussed in the numerical results on the velocity and pressure distributions.

Influence of Spoke Geometry on Performance and Internal Flow of Contra-Rotating Small-Sized Hydroturbine

2015 ◽  
Author(s):  
Toru Shigemitsu ◽  
Yasutoshi Takeshima ◽  
Chihiro Tanaka ◽  
Junichiro Fukutomi
Keyword(s):  
Flow Condition ◽  
Alternative Energy ◽  
High Performance ◽  
High Efficiency ◽  
Flow Analysis ◽  
Internal Flow ◽  
Stable Operation ◽  
Small Hydropower ◽  
Hydro Power ◽  
Flow Passage

Small hydropower generation is one of important alternative energy, and potential of small hydropower is great. Efficiency of small hydroturbines is lower than that of large one, and these small hydroturbine’s common problems are out of operation by foreign materials. Then, there are demands for small hydroturbines to keep high performance and wide flow passage. Therefore, we adopted contra-rotating rotors, which can be expected to achieve high performance and enable to use low-solidity rotors with wide flow passage, in order to accomplish high performance and stable operation. Final goal of this study is development of a small hydroturbine like electrical goods, which has high portability and makes an effective use of unused small hydro power energy source. Efficiency of the contra-rotating small hydroturbine was high in pico-hydroturbine and high efficiency could be kept in wide flow rate range. On the other hand, the relatively large loss occurred at the spokes which should be installed for this small hydroturbine to support the rotors. Then, the new spoke to increase its performance is proposed in this research. Internal flow condition, which was difficult to measure experimentally, was shown by the numerical flow analysis. Further, the influence of spoke geometry was clarified. Then, a relation between the performance and internal flow condition was considered by the numerical analysis results. In the present paper, the performance of the contra-rotating small hydroturbine using different spoke geometry is shown by the numerical results. Further, internal flow condition between the front and rear rotors are investigated.

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