Comparative Similarity Study on Hydraulic Losses of a Y-bifurcation

Umboro, Lasminto and R. Klasinc, . (2014) Comparative Similarity Study on Hydraulic Losses of a Y-bifurcation. In: International Symposium On Dams In A Global Environmental Challenges, 1 - 6 Juni 2014, Bali, Indonesia.

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Abstract

A Y-bifurcation often found in the piping system of a hydropower to divide the flow from a penstock into two turbines in the powerhouse. Hydraulic losses in turbulent flow occurred in the Ybifurcation are usually estimated by investigation in a physical model based on the similarity of the Reynolds number and the outcome of which is converted to its prototype. A problem occur when transferring the results of the physical model to the prototype due to the fact that in the physical model it maybe not possible to reach sufficient high flow velocity to reach the same Reynolds number as in the prototype. Therefore, a correlation of loss coefficients between physical model and the prototype is needed and it can be obtained by investigating a family model. Physical model family requires expensive investigation, however it can be reduced by using an additional numerical model. In this paper, authors present the comparison of differential pressure, differential energy, flow velocity and loss coefficient between result physical model and result of several turbulent numerical models such as k-, k-, Large Eddy Simulation and Reynolds Stress. Four numerical models of Ybifurcation with different scale simulated using the same Reynolds number produce proportional of differential pressure head and differential energy head, and similar of loss coefficient. Numerical model with different scales of Y-bifurcation shows a good agreement with the physical model. The closest result of turbulent model to the measurement was used to determine the loss coefficient of flow through a Y-bifurcation with high Reynolds number.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	loss coefficient, Y-bifurcation, physical model, numerical model, protoype
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering
Depositing User:	Mr. Tondo Indra Nyata
Date Deposited:	04 Apr 2023 04:03
Last Modified:	04 Apr 2023 04:05
URI:	http://repository.its.ac.id/id/eprint/97830

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