WANG Jian-dong 1, GONG Shi-hong 1, LI Guang-yong 2, ZHAO Yue-fen 3

1. Department of Irrigation and Drainage, IWHR, Beijing 100048
2. China Agricultural University, Beijing, 100083
3. Beijing IWHR Corporation, Beijing 100048)

Abstract: Emitter is one of the key parts in trickle irrigation system, and the structural forms of emitter greatly influence the working performance of drippers. In this paper, through orthogonal experiment array, the influence of dentations angles, spacing between dentations, dentations heights and depth of flow passages on the hydraulic performance of drippers under low working pressure are analyzed. The test results show that spacing between dentations and dentations angle has significant influence on the exponential (x) value of flow state (α =0.1), and the depth of flow passages, and spacing between dentations and dentations angle have significant influence on the flow rate of emitters (α =0.1). In addition, regression mathematical models describing the relationship between flow rate and structural parameters of flow passage have been set up under the present condition of flow passage length (19.4mm), dentations vertical gap (0mm) and at 5m working pressure.

Key words: low working pressure, drip irrigation, emitter, geometric parameter of flow passage, hydraulic performance

Published in: Journal of Hydraulic Engineering, Vol. 45, No. 1, 2014