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The Effect of the Central Angle and Height of Arced Piano Key Weir on the Discharge Coefficient
https://orcid.org/http://orcid.org/0000-0003-3965-1751
Piano key weirs (PKWs) are categorized as non-linear broad-crested weirs offering a high hydraulic performance. While there are several studies on the PKWs with conventional linear plan shapes, less attention has been paid to the PKWs with arced plan shapes, called arced piano key weirs (APKWs), particularly when applied in a channel. Besides, the effect of the central angle of the APKWs on the discharge coefficient has been ignored. In this study, the effect of the central angle and height of APKWs on the head-discharge relationships and discharge coefficient were investigated. Experiments were carried out on a linear trapezoidal piano key weir (TPKW) and APKWs with three central angles (16°, 32° and 53°) and two height ratios, P/Wu, (0.9 and 1.2) with P being the height of the weir and Wu the width of the one-cycle weir. The results showed that at a constant Ht/P (Ht is the total head) and at P/Wu = 0.9, the discharge over APKW-53 was 13% and at P/Wu = 1.2, the discharge over APKW-16, APKW-32 and APKW-53 was about 9, 14 and 20% higher than the TPKW, respectively.
The Effect of the Central Angle and Height of Arced Piano Key Weir on the Discharge Coefficient
https://orcid.org/http://orcid.org/0000-0003-3965-1751
Piano key weirs (PKWs) are categorized as non-linear broad-crested weirs offering a high hydraulic performance. While there are several studies on the PKWs with conventional linear plan shapes, less attention has been paid to the PKWs with arced plan shapes, called arced piano key weirs (APKWs), particularly when applied in a channel. Besides, the effect of the central angle of the APKWs on the discharge coefficient has been ignored. In this study, the effect of the central angle and height of APKWs on the head-discharge relationships and discharge coefficient were investigated. Experiments were carried out on a linear trapezoidal piano key weir (TPKW) and APKWs with three central angles (16°, 32° and 53°) and two height ratios, P/Wu, (0.9 and 1.2) with P being the height of the weir and Wu the width of the one-cycle weir. The results showed that at a constant Ht/P (Ht is the total head) and at P/Wu = 0.9, the discharge over APKW-53 was 13% and at P/Wu = 1.2, the discharge over APKW-16, APKW-32 and APKW-53 was about 9, 14 and 20% higher than the TPKW, respectively.
The Effect of the Central Angle and Height of Arced Piano Key Weir on the Discharge Coefficient
https://orcid.org/http://orcid.org/0000-0003-3965-1751
Piano key weirs (PKWs) are categorized as non-linear broad-crested weirs offering a high hydraulic performance. While there are several studies on the PKWs with conventional linear plan shapes, less attention has been paid to the PKWs with arced plan shapes, called arced piano key weirs (APKWs), particularly when applied in a channel. Besides, the effect of the central angle of the APKWs on the discharge coefficient has been ignored. In this study, the effect of the central angle and height of APKWs on the head-discharge relationships and discharge coefficient were investigated. Experiments were carried out on a linear trapezoidal piano key weir (TPKW) and APKWs with three central angles (16°, 32° and 53°) and two height ratios, P/Wu, (0.9 and 1.2) with P being the height of the weir and Wu the width of the one-cycle weir. The results showed that at a constant Ht/P (Ht is the total head) and at P/Wu = 0.9, the discharge over APKW-53 was 13% and at P/Wu = 1.2, the discharge over APKW-16, APKW-32 and APKW-53 was about 9, 14 and 20% higher than the TPKW, respectively.
The Effect of the Central Angle and Height of Arced Piano Key Weir on the Discharge Coefficient
Iran J Sci Technol Trans Civ Eng
Farhadi, Hooman (author) / Sabzevari, Touraj (author) / Karami Moghadam, Mehdi (author) / Noroozpour, Shabnam (author)
2023-02-01
9 pages
Article (Journal)
Electronic Resource
English
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