Experimental and numerical studies on flow and torque mechanisms of open cross-flow hydraulic turbine

2021 ◽  
Vol 65 ◽  
pp. 107-116
Author(s):  
T. Wang ◽  
H. Shikama ◽  
T. Yamagata ◽  
N. Fujisawa
Keyword(s):  
Cross Flow ◽  
Hydraulic Turbine ◽  
Numerical Studies

Experimental and numerical studies on the performance of a waterfall-type cross-flow hydraulic turbine

2021 ◽  
Vol 64 ◽  
pp. 128-138
Author(s):  
Hayato Shikama ◽  
Tianbo Wang ◽  
Takayuki Yamagata ◽  
Nobuyuki Fujisawa
Keyword(s):  
Cross Flow ◽  
Hydraulic Turbine ◽  
Numerical Studies

NUMERICAL STUDIES OF A FREELY VIBRATING CYLINDER IN A CROSS-FLOW

2001 ◽  
Vol 15 (6) ◽  
pp. 845-866 ◽  
Author(s):  
R.M.C. SO ◽  
Y. LIU ◽  
S.T. CHAN ◽  
K. LAM
Keyword(s):  
Cross Flow ◽  
Numerical Studies

Experimental and Numerical Study on the Effects of the Relative Position of Film Hole and Orientation Ribs on the Film Cooling With Ribbed Cross-Flow Coolant Channel

2020 ◽  
Author(s):  
Bingran Li ◽  
Cunliang Liu ◽  
Lin Ye ◽  
Huiren Zhu ◽  
Fan Zhang
Keyword(s):  
Heat Transfer ◽  
Relative Position ◽  
Film Cooling ◽  
Numerical Study ◽  
Cross Flow ◽  
Internal Cooling ◽  
Transfer Coefficients ◽  
Cooling Performance ◽  
Heat Transfer Coefficients ◽  
Numerical Studies

Abstract To investigate the application of ribbed cross-flow coolant channels with film hole effusion and the effects of the internal cooling configuration on film cooling, experimental and numerical studies are conducted on the effect of the relative position of the film holes and different orientation ribs on the film cooling performance. Three cases of the relative position of the film holes and different orientation ribs (post-rib, centered, and pre-rib) in two ribbed cross-flow channels (135° and 45° orientation ribs) are investigated. The film cooling performances are measured under three blowing ratios by the transient liquid crystal measurement technique. A RANS simulation with the realizable k-ε turbulence model and enhanced wall treatment is performed. The results show that the cooling effectiveness and the downstream heat transfer coefficient for the 135° rib are basically the same in the three position cases, and the differences between the local effectiveness average values for the three are no more than 0.04. The differences between the heat transfer coefficients are no more than 0.1. The “pre-rib” and “centered” cases are studied for the 45° rib, and the position of the structures has little effect on the film cooling performance. In the different position cases, the outlet velocity distribution of the film holes, the jet pattern and the discharge coefficient are consistent with the variation in the cross flow. The related research previously published by the authors showed that the inclination of the ribs with respect to the holes affects the film cooling performance. This study reveals that the relative positions of the ribs and holes have little effect on the film cooling performance. This paper expands and improves the study of the effect of the internal cooling configuration on film cooling and makes a significant contribution to the design and industrial application of the internal cooling channel of a turbine blade.

Experimental and numerical studies on the discrete noise about the cross-flow fan with block-shifted impellers

2010 ◽  
Vol 71 (12) ◽  
pp. 1142-1155 ◽  
Author(s):  
You Li ◽  
Hua Ouyang ◽  
Jie Tian ◽  
Zhaohui Du ◽  
Zhiming Zheng
Keyword(s):  
Cross Flow ◽  
Numerical Studies ◽  
The Cross ◽  
Cross Flow Fan

scholarly journals Frequency modelling and dynamic identification of cross-flow water turbines

2021 ◽  
pp. 354-354
Author(s):  
Daniel Stroita ◽  
Adriana Manea
Keyword(s):  
Power Plants ◽  
Dynamic Properties ◽  
Cross Flow ◽  
Hydraulic Turbine ◽  
Point Of View ◽  
Complex Flow ◽  
Dynamic Identification ◽  
Hydro Power ◽  
The Cross ◽  
Hydro Power Plants

The Cross-Flow turbines cover from the point of view hydraulic power the running domain of some well-known turbines such as Pelton, Francis or Kaplan. This type of turbine has a simple construction, long life and low execution cost, which makes it very suitable for on and off grid small to medium hydro power plants. It is quite difficult to establish an exact theoretical dynamic model for this type of turbines, due to the complex flow phenomenon (bi phase flow water and air). In order to obtain the exact dynamic behavior of the hydraulic machine, experimental dynamic identification will be done. In automation, the dynamic properties, represent the fundamental characteristic of the object which must be regulated. When the dynamic properties of the regulated object are obtained experimentally, we analyze the characteristics of the transient regime, which appears because of the application at the system inlet of some stochastic or deterministic signals (sine waves for our case). The hydraulic turbine is modeled as an informational quadrupole having the inlet parameters the movement of the wicket gate and the turbine head and outlet parameters the torque and the speed. In this paper it will be presented the frequency modelling of the cross flow turbine and the validation of the mathematical model through experimental dynamic identification.

scholarly journals Effects of Clearance between Rotor and Ground on the Performance of an Open Cross-Flow-Type Nano-Hydraulic Turbine

2016 ◽  
Vol 10 (8) ◽  
Author(s):  
Tomomi Uchiyama ◽  
Shouhei Mizoguchi ◽  
Shouichiro Iio ◽  
Yusuke Katayama ◽  
Toshihiko Ikeda
Keyword(s):  
Cross Flow ◽  
Hydraulic Turbine ◽  
Flow Type

scholarly journals Reducing cross-flow vibrations of underflow gates: Experiments and numerical studies

2014 ◽  
Vol 50 ◽  
pp. 25-48 ◽  
Author(s):  
C.D. Erdbrink ◽  
V.V. Krzhizhanovskaya ◽  
P.M.A. Sloot
Keyword(s):  
Cross Flow ◽  
Numerical Studies

Rotor-Tip Leakage: Part II — Design Optimization Through Viscous Analysis and Experiment

1981 ◽  
Author(s):  
A. R. Wadia ◽  
T. C. Booth
Keyword(s):  
Stream Function ◽  
Discharge Coefficient ◽  
Cross Flow ◽  
Turbine Rotor ◽  
Leakage Flow ◽  
Tip Leakage ◽  
Rotating Blades ◽  
Numerical Studies ◽  
Coolant Injection ◽  
Blade Tip

Blade tip losses represent a major efficiency penalty in a turbine rotor. These losses are presently controlled by maintaining close tolerances on tip clearances. This two-part paper outlines a new methodology for predicting and minimizing tip flows, and focuses on the control of tip leakage through minimization of the discharge coefficient to control the normal leakage flow component. Minimization of the discharge coefficient was achieved through viscous analysis and was supported by discharge-rig testing. The analysis for the discharge cross-flow used a stream function-vorticity formulation. Support testing was conducted with a newly developed water table discharge rig in which tip-coolant discharge could also be simulated. Experimental and numerical tip-leakage results are presented on a discharge coefficient parameter for five different tip configurations. In addition, numerical studies were conducted for stationary and rotating blades with and without tip coolant injection.

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