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Open AccessArticle

An Experimental Study on the Effects of Atomized Rain of a High Velocity Waterjet to Downstream Area in Low Ambient Pressure Environment

1
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China
2
School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan 056038, China
3
Zhejiang East China Engineering Consulting co. LTD of PowerChina Huadong Engineering Corporation Limited, No.201 Gaojiao Road, Yuhang District, Hangzhou 311122, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 397; https://doi.org/10.3390/w12020397
Received: 23 December 2019 / Revised: 29 January 2020 / Accepted: 31 January 2020 / Published: 1 February 2020
(This article belongs to the Special Issue Advances in Environmental Hydraulics)
A better understanding of the atomized rain characteristics in low ambient pressure areas is beneficial in reducing the jeopardizing effect of flood discharge atomization on high-altitude hydropower stations. A random splash experiment is designed with two measurement planes to investigate the effects of low ambient pressure on downstream atomized rain under the complicated conditions of low ambient pressure (within 0.60P0~1.00P0) and high waterjet velocity (at a magnitude of 10 m/s). The results demonstrate that the atomized rain (rain intensity ≥ 2 mm/h) downstream, characterized by two-dimensional distribution, can be enhanced by decreasing the ambient pressure and by increasing the inflow discharge. When the ambient pressure decreases at the same inflow discharge, both the distance of the rain intensity lines (40 mm/h, 10 mm/h, 2 mm/h) in the horizontal plane from the constricted nozzle outlet and the average rain amount in the inclined plane within the atomized source ratio of ((0~30) × 10−3)% appear as “linear” growth. With the ambient pressure decreasing by 0.10P0, the range of those characteristic rain intensity lines is expanded by 0.68%~1.37%, and the average rain amount is enlarged by 11.06%~20.48%. When keeping the low ambient pressure unchanged, both the point average rain intensity reduction along the releasing centerline and the surface average rain amount growth with increased inflow discharge all follow an exponential function. The aeration reduction in the waterjet boundary and the resistance reduction in atomized water-droplets are contributing factors for the enhancement effect of low ambient pressure. This study can enable the establishment of a foundation to further predict flood discharge atomization in a high-altitude environment. View Full-Text
Keywords: low ambient pressure; random splash experiment; atomized rain; downstream spatial distribution; rain intensity low ambient pressure; random splash experiment; atomized rain; downstream spatial distribution; rain intensity
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MDPI and ACS Style

Liu, D.; Lian, J.; Liu, F.; Liu, D.; Ma, B.; Shi, J. An Experimental Study on the Effects of Atomized Rain of a High Velocity Waterjet to Downstream Area in Low Ambient Pressure Environment. Water 2020, 12, 397.

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