ENERGY CHANGES IN ABRUPT EXPANSION OF IRRIGATION CHANNELS WITH SUPERCRITICAL FLOW

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KOUCHAKZADEH M.; BANIHASHEMI M.; HOMAEI M.; OVEYSI A.

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Journal: JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH Year:2003 | Volume:3 | Issue:13 Page(s): 55-65

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Title

ENERGY CHANGES IN ABRUPT EXPANSION OF IRRIGATION CHANNELS WITH SUPERCRITICAL FLOW

Author(s)

KOUCHAKZADEH M. | BANIHASHEMI M. | HOMAEI M. | OVEYSI A. | Issue Writer Certificate

Keywords

ABRUPT EXPANSIONQ4

ENERGY LOSSQ4

SUPERCRITICAL FLOWQ4

Abstract

Designing irrigation canals such that the water level at outlets lays above the whole irrigated area is crucial both from management and economical point of views. The exact analysis of the flow energy, particularly at transitions, before, and after them is a prerequisit to exact water level determination. The ENERGY LOSS in ABRUPT EXPANSIONs with subcritical flow has been extensively studied by several researches. However, less attentions were focused on SUPERCRITICAL FLOW in sudden transitions. The objective of this study was to investigate the ENERGY LOSS in a sudden expansion with "supercritical flow". Subsequently, an experimental physical model was established in the laboratory and the required data were collected accordingly. The expansion ratios of 1:0.7, 1:0.55, 1:0.4 and 1:0.3 were experimentally established and the discharges were changed from 20 to 70 liters per second for each of the ratios. The SUPERCRITICAL FLOW was generated, using a sluice gate. The flow was entered the expansion after passing the entrance channel of 3 meter length. The calculated ENERGY LOSS data and the measurement sections were scaled by choosing the specific energy of flow and the inlet flow characteristics as scale factors, respectively. The inlet flow characteristics were selected to be depth, width and the Froud number. Thus the dimensionless ENERGY LOSS and measurement sections were obtained. The dominant flow parameters affecting the ENERGY LOSS, mainly bed friction and turbulences, were fully monitored through the whole experiment. An empirical relation was obtained for the ENERGY LOSS in SUPERCRITICAL FLOW passing an ABRUPT EXPANSION. The results of 19 conducted tests were also indicated no significant difference in the regions that were far from the entering jet. These results were obtained based upon the assumption of constant flow depth across the width at the transition entrance. It was also assumed that there was no ENERGY LOSS between the entrance and the expansion. All the calculations were made based on the gradually varied flow theory.

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APA: Copy

KOUCHAKZADEH, M., BANIHASHEMI, M., HOMAEI, M., & OVEYSI, A.. (2003). ENERGY CHANGES IN ABRUPT EXPANSION OF IRRIGATION CHANNELS WITH SUPERCRITICAL FLOW. JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, 3(13), 55-65. SID. https://sid.ir/paper/27996/en

Vancouver: Copy

KOUCHAKZADEH M., BANIHASHEMI M., HOMAEI M., OVEYSI A.. ENERGY CHANGES IN ABRUPT EXPANSION OF IRRIGATION CHANNELS WITH SUPERCRITICAL FLOW. JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH[Internet]. 2003;3(13):55-65. Available from: https://sid.ir/paper/27996/en

IEEE: Copy

M. KOUCHAKZADEH, M. BANIHASHEMI, M. HOMAEI, and A. OVEYSI, “ENERGY CHANGES IN ABRUPT EXPANSION OF IRRIGATION CHANNELS WITH SUPERCRITICAL FLOW,” JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, vol. 3, no. 13, pp. 55–65, 2003, [Online]. Available: https://sid.ir/paper/27996/en

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