Exhaust performance of pressure distribution air inbreathe-release valve in large-scale irrigation pipe networks
YANG Xiawei1,2, CHEN Songshan1, YU Xianlei1, ZHOU Mingyao1*
1.School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2.Jiangsu Surveying and Design Institute of Water Resources Co. Ltd., Yangzhou, Jiangsu 225127, China
In order to solve the problem of common air inbreathe-release valves cannot exhaust continuously under the condition of gas and liquid intervalin large-scale irrigation pipe networks, a new type of air inbreathe-release valvewith principle of pressure distribution was designed. The numerical simulation and physical modeling test were used to study on exhaust process and air displacement under the conditions of different valve openings and different exhaust pressure differences. The effects of valve opening degree and exhaust pressure difference on internal flow in the main valve cavity and valve exhaust volume was verified. The deviations of measured values and numerical results were between 0.08% and 6.43%, which verified the correctness of the numerical simulation.The physical test measured the maximum exhaust volume of new DN50 air inbreathe-release valve. The exhaust volumes of new air inbreathe-release valve exceed 27.31% and 21.71% which specified in the rela ted industry specifications when the exhaust pressure difference is 0.035 MPa and 0.070 MPa. Its exhaust performance is good.
YANG Xia-Wei-,,CHEN Song-Shan- et al. Exhaust performance of pressure distribution air inbreathe-release valve in large-scale irrigation pipe networks[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(10): 975-980.
ZHAO Li, YANG Yusi, LU Yudong, et al. Performance of exhaust valve in long-distance water transfer project[J]. South-to-north water transfers and water science & technology, 2014, 12(6):213-216.(in Chinese)
MALEKPOUR A, KAMEY B W. Profile-induced co-lumn separation and rejoining during rapid pipeline filling[J]. Journal of hydraulic engineering, 2014, 140(11):1-12.
BALACCO G, APOLLONIO C, PICCINNI A F. Experimental analysis of air valve behaviour during hydraulic transients[J]. Journal of applied water engineering & research, 2015, 3(1):3-11.
LI Xiaozhou, ZHU Manlin, TAO Can. Impacts of type of air valve on water hammer protection in pressurized pipelines[J]. Journal of drainage and irrigation machinery engineering, 2015,33(7):599-605.(in Chinese)
ZHOU L D, LIU D, Karney B. Investigation of hydraulic transients of two entrapped air pockets in a water pipeline[J]. Journal of Hydraulic Engineering, 2013, 139(9):949-959.