System design and performance analysis of travelling irrigators in relation to their power units
Poor performance and mechanical failures of travelling irrigators are caused by improper overall system and power unit design. Power and winching units reviewed showed that water-motors and cable-winches are popular in travelling irrigator design. Theoretical power use analysis was developed for cable-tow irrigators and terms of power balance equations were measured by laboratory and field tests. Laboratory tests showed that the highest efficiency of the turbine power unit of a Turborain B 100 fixed boom travelling irrigator was 54 %, giving 1.9 kW power output and 4.7 Nm torque, in 2650 1/min flowrate. Equations were created by laboratory tests in order to assess the turbine, performance during field tests. Field testing procedure along one full run length was created for cable-tow travelling irrigators. Some indicative results were: The rotating boom of Rotorainer 175 stalls in 60.8 km/hr wind speed with cable tension up to 18.7 kN, or 31.9 kN cable tension and wind speed up to 29 km/hr. The 0.77 % of 9.4 kW water power consumption from the hydrant was the effective power for motion. The highest application efficiency was 99 % with uniformity coefficient 89 %. The Turborain B100 turbine was operating at 37 % efficiency using 12.4 % of the 7.5 kW water power from the hydrant, and the winching unit had 60 % efficiency at peak cable tension of 23.7 kN. The highest application efficiency was 94.8 % with uniformity coefficient 82.7 %. The Southern Cross TCD 2000 small raingun had 6.7 kN peak cable tension being 18.9 % of the tension stalling the hydraulic piston. The effective power for motion was 0.63 % of the 10.7 kW water power consumption from the hydrant. The highest application efficiency was 87.4 % with uniformity coefficient 75.3 %.... [Show full abstract]
Keywordsapplication depth; application efficiency; application rate; field tests procedure; fixed boom travelling irrigator; power use analysis of cable tow travelling irrigators; raingun travelling irrigator; rotating boom travelling irrigator; self propelled irrigation systems; travelling irrigators; travelling irrigators performance analysis; travelling irrigators power units; travelling irrigators system design; travelling irrigators winching units; turbine; turbine efficiency; turbine laboratory tests; turbine specific speed; uniformity coefficient; irrigation
Access RightsDigital thesis can be viewed by current staff and students of Lincoln University only. Print copy available for reading in Lincoln University Library.
Showing items related by title, author, creator and subject.
Becken, Susanne; Schiff, A. (Sage Publications, 2011-05-01)We analyse data on the distances travelled using car and air transport modes in New Zealand by a large sample of international tourists from six different countries of origin. We use two-stage hurdle models to relate both ...
Chong, Michelle C. C. (Lincoln UniversityCanterbury, 2004)Since the September 11, 2001 terrorist attacks, the Iraq War, and the outbreak of SARS and the bird flu in the Far East and Canada, the air travel industry has been severely depressed. Moreover, "no-frills" airlines such ...
A situational analysis and assessment of the development potential of the Russian tourist market to New Zealand Yuzhanin, Sergey (Lincoln University, 2014)Russia is one of the fastest growing emerging tourist markets in the world. However, while substantial academic effort has been put into studying other tourist markets, it appears that still very little is known of the ...