نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار مرکز ملی تحقیقات شوری، سازمان تحقیقات، آموزش و ترویج کشاورزی، یزد، ایران
2 دانشیار مرکز ملی تحقیقات شوری، سازمان تحقیقات، آموزش و ترویج کشاورزی، یزد، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
This study was designed and carried out to determine the effects of operating pressure and irrigation water salinity on the performance of common pressure- compensating emitters in irrigation systems. The study evaluated three commercial brands, namely, “Netafim”, “Eurodrip,” and “Peresi Zalvan”. These emitters were tested at flow rates of 8 and 24 L/h under operating pressures of 0.5, 1.5, and 2.5 bars. Additionally, two levels of water salinity (5 and 12 dS/m) were considered. The results revealed that increasing operating pressure from 0.5 to 2.5 bars and raising salinity from 5 to 12 dS/m led to either increased or unchanged coefficient of discharge variations in different emitters. Comparing pre-test (new) emitters with post-test (used) ones showed variations due to various factors, including pressure changes, salinity effects, and inherent emitter characteristics. Notably, the impact of salinity did not result in significant differences in emitter performance under varying pressure conditions. However, for the Netafim and Eurodrip emitters (8 L/hr), averaging the results across all three operating pressures indicated that increased salinity led to reduced discharge. Specifically, the reduction was approximately 3.8% for Netafim and 2.6% for Eurodrip. Also, it was concluded that the application of 2.5 bar pressure led to the entry of parts and solid objects in the irrigation pipes or passed through the filtration system into the emitters, resulting in a decrease in flow rate. However, this problem can be solved to a large extent by washing the pipes before starting the system. Netafim emitters (8 L/hr), despite the lack of significant entry of these objects, had a diaphragm adhesion problem, and showed the greatest decrease in flow rate due to this reason. A detailed examination of the destroyed samples showed that the reason for these differences was the different shape and structure of the water inlet. Accordingly, the smallness of the cross-sectional area of water inlet, reduces the entry of solid parts. Therefore, application of 2.5 bar pressure resulted in the highest rate of solid parts entry into the Peresi Zalvan with the largest cross-sectional area and the lowest rate of entry in the Netafim (8 L/hr). However, this problem can be solved to a large extent by washing the pipes before starting the system.
کلیدواژه‌ها [English]
(DOI): 20.1001.1.20087942.1398.13.5.1.5
(DOI): 10.22055/JISE.2010.13379
. (DOI) 10.22055/JISE.2009.13393
https://civilica.com/doc/173404
(DOI): 10.22059/IJSWR.2019.278268.668151
(DOI): 20.1001.1.23222069.1392.20.1.11.9
)