naa a22 4500 510765785 CHVBK 20180411083156.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s11630-013-0659-1 doi (NATIONALLICENCE)springer-10.1007/s11630-013-0659-1 Study on the performance deterioration of mixed flow impeller due to change in tip clearance [Elektronische Daten] [D. Ramesh Rajakumar, S. Ramamurthy, M. Govardhan] Performance of mixed flow compressor with un-shrouded impeller strongly depends upon unsteady, asymmetrical flow fields in the axial directions. The flow through the mixed flow impeller is complex due to three-dimensional nature of geometry. In mixed flow impeller, there are clearances between the rotating impeller blades and the casing as the high pressure ratio compressors are usually open shrouded impellers. As a result, certain amount of reduction in the performance is unavoidable due to clearance flows. In the present investigations, numerical analysis is performed using a commercial code to investigate tip clearance effects on through flow. The performance of mixed flow impeller with four different clearances between impeller and stationary shroud are evaluated and compared with experimental results. The impeller performance map was obtained for different operating speeds and mass flow rates with different tip clearances. The result shows that the tip leakage flow strongly interacts with mainstream and contributes to total pressure loss and performance reduction. The pressure and performance decrement are approximately linearly proportional to the gap between impeller and stationary shroud. The analysis showed scope for improvement in design of the compressor for better performance in terms of efficiency and operating range. Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg, 2013 Mixed Flow Compressor nationallicence Surge nationallicence Stall nationallicence Choke nationallicence CFD nationallicence Tip Clearance nationallicence Compressible Flow nationallicence Periodic nationallicence Grids and Jet-Wake nationallicence Ramesh Rajakumar D. National Aerospace Laboratories, 560017, Bangalore, India aut Ramamurthy S. NCAD, National Aerospace Laboratories, 560017, Bangalore, India aut Govardhan M. Thermal Turbomachines laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, 600036, Chennai, India aut Journal of Thermal Science Springer Berlin Heidelberg 22/6(2013-12-01), 532-538 1003-2169 22:6<532 2013 22 11630 https://doi.org/10.1007/s11630-013-0659-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11630-013-0659-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ramesh Rajakumar D. National Aerospace Laboratories, 560017, Bangalore, India aut NATIONALLICENCE 700 1- Ramamurthy S. NCAD, National Aerospace Laboratories, 560017, Bangalore, India aut NATIONALLICENCE 700 1- Govardhan M. Thermal Turbomachines laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, 600036, Chennai, India aut NATIONALLICENCE 773 0- Journal of Thermal Science Springer Berlin Heidelberg 22/6(2013-12-01), 532-538 1003-2169 22:6<532 2013 22 11630 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer