Author(s)

Ilan Ich^1,2, Genguang Zhang^1*, Anbin Li¹, Vinhteang Kaing^2,3, Ty Sok^2,4

¹College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, China.
²Faculty of Hydrology and Water Resources Engineering, Institute of Technology of Cambodia, Russian Federation Blvd., Phnom Penh, Cambodia.
³Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology, Tokyo, Japan.
⁴Research and Innovation Center, Institute of Technology of Cambodia, Russian Federation Blvd., Phnom Penh, Cambodia.

A modified piano key weir with a rounded nose and a parapet wall (MPKW) can improve the discharge capacity significantly compared to a standard piano key weir. However, the optimum of the inlet/outlet width ratio (Wi/Wo) on the discharge efficiency of MPKW is still not investigated numerically. The present work utilized the numerical modeling to investigate and analyze the effects of the inlet/outlet key width ratios on the hydraulic characteristics and discharge capacity of the MPKW. To validate the numerical model with the experimental data, the results indicate that the average relative error is 2.96%, which confirms that the numerical model is fairly well to predictthe specifications of flow over on the MPKW. Numerical simulation results indicated that the discharge capacity of the MPKW can be improved up to 8.5% by optimizing the Wi/Wo ratio ranging from 1.53 to 1.67 even if the other parameters of the MPKW keep unchanged. A big Wi/Wo ratio generally leads to an increase in discharge capacity at low heads and a little effect on the discharge efficiency at high heads. The discharge efficiency of the inlet and outlet crests increases up to 9.6% for high heads, while discharge efficiency of the lateral crest decreases up to 23.5% compared with the reference model. The findings of the study revealed that the intrinsic influencing mechanism of the Wi/Wo ratio on the discharge performance of MPKWs.

Discharge Capacity, FLOW-3D, Hydraulic Characteristics, Numerical Simulation, Modified Piano Key Weir, Parameter Optimization

Ich, I. , Zhang, G. , Li, A. , Kaing, V. and Sok, T. (2023) Numerical Study on Hydraulic Characteristics and Discharge Capacity of Modified Piano Key Weir with Various Inlet/Outlet Width Ratio. World Journal of Engineering and Technology, 11, 113-135. doi: 10.4236/wjet.2023.111009.