Araştırma Makalesi

Yağmurlama sulama sistemlerinde kullanılan redüksiyonlarda basınç kayıplarının incelenmesi: Deneysel, sayısal ve CFD yaklaşımlarıyla

Cilt: 62 Sayı: 4 12 Aralık 2025
PDF İndir
EN TR

Investigation of local pressure losses in reducers for sprinkler irrigation systems: Experimental, analytical and CFD approaches

Abstract

Objective: This study aims to investigate the local pressure losses for conical reducers used in sprinkler irrigation systems using experimental, analytical, and Computational Fluid Dynamics (CFD) methods. Material and Methods: Eight different reducers with nominal outer diameters of 90-75, 110-90, and 110-75 mm were considered. In the experiments, the pressure losses in the reducers were measured at different water flow rates. The CFD analysis was carried out using the Realizable k-ε, SST k-, and RSM turbulence models. The pressure loss coefficients were determined by measurements, analytically, and CFD analysis and were compared with each other. Results: Taking the experimental data into account, the local loss coefficients for the R19075, R29075, R411090, and R511090, reducers were determined to be values between 0.5 and 1.0. The R611075, and R711075, R811075 reducers local loss coefficients between 0.8 and 1.5 were determined. The local loss coefficients determined using the SST k- turbulence model considered in the CFD analysis were in better agreement with the experimental results. Conclusion: It can be said that the pressure losses in the newly designed reducers could be determined by the CFD analysis at the design stage, and it would be useful to use these values in the system design.

Keywords

CFD , conical contraction , fitting , local friction loss , minor pressure loss , reduction

Kaynakça

  1. ANSYS, 2016. Fluent theory guide R.17.2. Canonsburg, PA: ANSYS, Inc., 850 pp.
  2. ASAE, 2003. Procedure for testing and reporting pressure losses in irrigation valves. ASAE S447, Feb03, ASAE Standards 2003: 941-943.
  3. Bagarello, V., V. Ferro, G. Provenzano & D. Pumo, 1997. Evaluating pressure losses in drip-irrigation lines. Journal of Irrigation and Drainage Engineering, 123 (1): 1-7. https://doi.org/10.1061/(ASCE)0733-9437
  4. Cengel, Y. A. & J. M. Cimbala, 2006. Fluid Mechanics: Fundamentals and Applications (1st edition). NY: McGraw-Hill, 940 pp.
  5. Choi, S. H., S. Kim, J. Choi, J. T. Park & H. Jeong, 2019. Optimum angles of non-standard diffusers and reducers for engineering application. Journal of Mechanical Science and Technology, 33 (10): 4831-4841.
  6. Crane, 1982. Flow of fluids through valves, fittings, and pipe. Joliet, IL: Metric Edition Crane Co, 133 pp.
  7. Cürebal, T., 2016. Boru ekleme parçalarındaki akışın üç boyutlu incelenmesi. Karadeniz Teknik Üniversitesi, (Unpublished), Trabzon, 71 pp.
  8. Das, P., M.M.K. Khan, M.G. Rasul & S. C. Saha, 2015. “Fluid flow charactericitics on scale deposition in a concentric reducer using CFD approach, 878-883”. 11th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (20-23 July 2015, South Africa), 883 pp.
  9. Daugherty, R. L. & J. B. Franzini, 1965. Fluid mechanics with engineering applications. (6th edition). NY: McGraw-Hill Book Company, 574 pp.
  10. Deev, A. V., T. Rasheed, M. C. Welsh, M. M. K. Khan & M. G. Rasul, 2009. Measurement of instantaneous flow velocities in a concentric reducer using particle image velocimetry: Study of scale deposition. Experimental Thermal and Fluid Science, 33 (6): 1003-1011.

Kaynak Göster

APA
Demir, V., & Yürdem, H. (2025). Investigation of local pressure losses in reducers for sprinkler irrigation systems: Experimental, analytical and CFD approaches. Journal of Agriculture Faculty of Ege University, 62(4), 435-449. https://doi.org/10.20289/zfdergi.1623449