科研之友
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摘要
The hydraulic property of drip emitters is primarily reflected in steady dissipation of pressure energy by flow resistance. The dentate path helps in dissipating energy as water travels to the emitter opening and maintains a turbulent flow condition that facilitates movement of particulate material out of system to avoid clogging. In this study, ernitters were designed using variable geometric parameters. The visualisation characteristics of computational fluid dynamics (CFD) was utilised for analysing the law of impact on flow movement by the path width (1.6, 1.3, 1.0, 0.6 mm), dentate height (1.0, 1.3, 1.6, 2.0 mm) and dentate angle (32', 41', 53', 63') and revealed the correlation relationship between the dentate structure of flow path of emitters and energy dissipation. Meanwhile, an anti-clogging analysis was conducted. The simulation results indicated that the selected turbulent model and the numerical algorithrn were suitable for the hydraulic calculation in flow paths. The rear of dentations and dentate tips were the primary regions for energy dissipation. The flow exponent with both dentate height and path width being 1.3 rum was minimum and the boundary flow velocity was maximum, i.e., there was good hydraulic performance and sound anti-clogging capacity. Larger dentate angles had an active role in enhancing hydraulic performance but with a poor anti-clogging property. Adjusting dentate jet effect by modifying the boundary structure of dentate flow paths could improve the inner flow pattern, enhance pressure energy dissipation, and improve boundary flow velocity, which was the key to enhancing hydraulic property and anti-clogging property within flow path of emitters.
- 出版日期2007-12
- 单位中国农业大学
