PERFORMANCE OF ROTATING SPRAY PLATE SPRINKLERS

Ahmed, M. A. M.; Awaad, M. A.; El-Ansary, M.Y.; El-Haddad, Z. A.

doi:10.21608/mjae.2010.105847

PERFORMANCE OF ROTATING SPRAY PLATE SPRINKLERS

Document Type : Original Article

Authors

¹ Centr. Admin. of Agric. Extension., Ministry of Agriculture, Egypt.

² Dept. of Agric. Eng; Fac. of Agric., Benha University, Egypt.

10.21608/mjae.2010.105847

Abstract

Understanding the distribution characteristics of an individual irrigation sprinkler or spray nozzle is necessary to improve the uniformity of any sprinkler system.Relevant factors affecting the improvement of the irrigation performance of sprinkler systems are the engineering factors (i.e. operating pressure, riser height of sprinkler / nozzle, sprinkler type, deflector plates, and nozzle diameter), and the climatic factors (i.e. wind speed, air humidity and air temperature). It is important to highlight that this study has been focused on center pivot sprinkler irrigation system as it is the widely used sprinkler irrigation system in new lands of Egypt ( Toshka, Sinai and Nobaria).Therefore, five different types of spray nozzles, used on center pivot irrigation system, have been tested and evaluated. Several outdoor single-sprinklers and overlapped - sprinklers irrigation tests have been conducted for determining: water application rate, uniformity of water distribution, and application efficiency, under different engineering and climatic conditions.
Various sprinkler types - pressure -riser height combinations were used and the variation of application rate and weather conditions (i.e. air temperature, relative humidity, and wind speed) were measured during the test. A statistical approach has been used with these data to estimate water distribution uniformity coefficient CU, and water application efficiency AE, using a linear model. CU, and AE as sprinkler irrigation performance parameters, were estimated as functions of the sprinkler type, nozzle characteristics, riser height, operating pressure, and wind speed. Other climatic and engineering factors were not of significant effect on the CU or AE in this study. The model can be a useful tool to select the operational conditions (e.g. working pressure, riser height, nozzle type)

that can be suitable for certain environmental conditions ( air temperature, relative humidity, etc.) to improve water distribution uniformity CU and water application efficiency AE.

Main Subjects

Agricultural Irrigation and Drainage Engineering

References

AH KOON D.1994. L’Irrigation avec le système pivot.PROSI Magazine (308):22- 27.

ASAE-Standards, 50 ed. S436.1 June, 2001. Test procedure for determining the uniformity of water distribution of central pivot and lateral move irrigation machines equipped with spray or sprinkler nozzles. St.Joseph, Mich. ASAE: 906-912.

Christiansen, J.E. 1942. ″Irrigation by sprinkling.″ Bull. No.670,

Uni.of Cal. Coll. of Agr. Exp. Station, Berkeley, 110-116.

DeBoer. D.W., Beck. D.L. and Bender. A.R. 1992. A field evaluation of low, medium and high pressure sprinklers. Trans. ASAE 35(4): 1185-1189.

Faci, J. M., Salvador, R., Playan, E., and Sourell, H. 2001. " Comparison of fixed and rotating spray plate sprinklers." J. Irrig. Drain. Engin.., 127(4), 224- 233.

Keller, J. and Bliesner, R. D. 1990. Sprinkler and Trickle Irrigation,AVI Book. New York. : Van Nostrand Reinhold. (1702).

Kincaid, D.C. 2005. Application Rates from Center Pivot Irrigation Current Sprinkler Types. Applied Engineering in Agriculture, ASAE Vol. 21(4): 605-610.

Li, J. 1997." Effect of pressure and nozzle shape on the characteristics of sprinkler droplet spectra". J. Agric. Eng. Res. 66; 15-21.

Nelson, 2003. Nelson Irrigation Corporation, Interactive Brochore,Water Application Solution. Walla Walla, WA USA. www.nelsonirrigation.com.

Sourell, H. Faci, J. M. and Playan, E. 2003. Performance of rotating spray plate sprinklers in indoor experiment. Irrigation and Drainage Eng. 129(5): 376-380.

Tarjuelo, J.M., Montero, J. Carrion, P. Honrubia, F.T. and Calvo. M.A. 1999b. Irrigation uniformity with medium size sprinklers. Part 11. Influence of wind and other factors on water distribution. Trans. ASAE 42(3): 677-689.

Thompson A.L; Martin D.L; Norman J.M; Tolk J.A; Howell T.A; Gilley J.R; Schneider A.D. 1997. Testing of a water loss distribution model for moving sprinkler systems. Transactions of the ASAE, 40(1): 81-88.