By City University of London, Institution of Mechanical Engineers (IMechE)
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Extra info for 8th International Conference on Compressors and their Systems: 9-10 September 2013, City University London
Also in this case, the abundant oil injection seals the clearances between rotor and stator (on the perpendicular planes which “closes” the cylindrical stator) and when the vane is pushed all the way into the rotor (when the vane after having discharged the compressed air, is moving towards a new intake). Screw compressors have difficulty operating at low rotational speed and their volumetric efficiency is higher when rotational speed increases. This is due to the geometrical “blow hole” a fixed leakage path between the high pressure and low pressure sides of a screw compressor, which is inherent to its very design and impossible to eliminate totally.
Water cooled machines have a slightly lower value and a reduced scatter. 7 kW/m3/min is the asymptotic value for flow rates greater than 50 m3/min. 4 kW/m3/min) characterize higher flow rates. The specific consumption at zero capacity is a significant part of the rated machine consumption; so, load/unload machine control is a wasteful strategy. Figure 9a) Specific energy, 7bar@0Flow @fixed speed Figure 10a) Specific energy, 7bar@0Flow @variable speed Figure 9b) Specific energy, 8bar@0Flow@fixed speed Figure 10b) Specific energy, 8bar@0Flow@variable speed Figure 9c) Specific energy, 9bar@0Flow@fixed speed Figure 10c) Specific energy, 9bar@0Flow@variable speed Figure 9d) Specific energy, 10bar@0Flow@fixed speed Figure 10d) Specific energy, 10bar@0Flow@variable speed 37 Figures 9 and 10 refer to the specific consumption according to machines operated at fixed speed (Figure 9) and those at variable speed (Figure 10).
Cipollone, G. Bianchi, G. Contaldi, Ottimizzazione energetica di compressori a palette, Congresso ATI 2012. Trieste, Italy, September 2012 (in Italian)  R. Cipollone, G. Contaldi, G. Bianchi, D. Di Battista, A. Capoferri, S. Murgia, Energy optimization in air compression: theoretical and experimental research activity on a sliding vane rotary compressors, Motor Driven Systems Conference, Birmingham 8-9, 11, 2011, UK  A. V. Olver et al. Tip blade hydro-dynamic behavior in SVRC, Private communication, Department of Mechanical Engineering, Imperial College, London, September 2004  E.