t Investigation of the Centrifugal Force Effect to a Revolving Vane (RV) Expander

The Revolving Vane (RV) machine is unique because the cylinder rotates together with the rotor at their respective axis. This causes various unique behaviors that are not previously observed in the conventional rotary machines. In this paper, the effects of the centrifugal force to the behavior of the machine are investigated. It is found that the centrifugal force affects the average output torque through the shaft bearing load and friction loss. Interestingly, if the center of mass is set properly, the centrifugal force can help to offset the pressure force acting at the shaft. This helps to reduce the bearing load and increases the mechanical efficiency of the machine. The finding can be used to optimize the RV machine design.

[1]  Masaru Matsui,et al.  Development of the High-Efficiency Technology of a CO2 Two-Stage Rotary Expander , 2009 .

[2]  Eckhard A. Groll,et al.  Piston-cylinder work producing expansion device in a transcritical carbon dioxide cycle. Part I: experimental investigation , 2005 .

[3]  Ahmed Kovacevic,et al.  Numerical simulation of combined screw compressor-expander machines for use in high pressure refrigeration systems , 2006, Simul. Model. Pract. Theory.

[4]  A. Subiantoro,et al.  Analytical study of the endface friction of the revolving vane mechanism , 2010 .

[5]  Eckhard A. Groll,et al.  Piston-cylinder work producing expansion device in a transcritical carbon dioxide cycle. Part II: theoretical model , 2005 .

[6]  Eckhard A. Groll,et al.  Efficiencies of transcritical CO2 cycles with and without an expansion turbine , 1998 .

[7]  Hyun-Jin Kim,et al.  Numerical simulation on scroll expander–compressor unit for CO2 trans-critical cycles , 2006 .

[8]  Alison Subiantoro,et al.  Introduction of the Revolving Vane Expander , 2009 .

[9]  K. Ooi,et al.  Design and Friction Analysis of the Improved Revolving Vane (RV-I) Compressor , 2008 .

[10]  Mitsuhiro Fukuta,et al.  Performance of Vane-Type CO2 Expander and Characteristics of Transcritical Expansion Process , 2009 .

[11]  Kim Tiow Ooi,et al.  Design analysis of the novel revolving vane expander in a transcritical carbon dioxide refrigeration system. , 2010 .

[12]  Y. L. TEH,et al.  DESIGN AND FRICTION ANALYSIS OF THE REVOLVING VANE COMPRESSOR , 2006 .

[13]  Yongliang Teh,et al.  Analysis of Internal Leakage Across Radial Clearance in the Improved Revolving Vane (RV-i) Compressor , 2008 .