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Proceedings of IMECE04 2004 ASME International Mechanical Engineering Congress November 13–19, 2004, Anaheim, California USA IMECE2004-59022 RADIAL-FLOW WAVE ROTOR CONCEPTS, UNCONVENTIONAL DESIGNS AND APPLICATIONS Janusz Piechna Warsaw University of Technology Institute of Aeronautics and Applied Mechanics 24 Nowowiejska Str. Warsaw, Poland Phone: +48 (22) 660 7768 Fax: +48 (22) 622 0901 Email: jpie@meil.pw.edu.pl Florin Iancu Michigan State University Mechanical Engineering Department 2500 Engineering Building East Lansing, Michigan 48824-1226 Phone: +1 (517) 432 1102 Fax: +1 (517) 353 1750 Email: ihuin@egr.msu.edu ABSTRACT Wave rotor technology has shown a significant potential for performance improvement of thermodynamic cycles. The wave rotor is an unsteady flow machine that utilizes shock waves to transfer energy from a high energy fluid to a low energy fluid, increasing both temperature and pressure of the low energy fluid. While several different configurations of mainly axial-flow wave rotors have been studied in the past, its four-port version with straight channels has been used most widely. During the past century, extensive experimental and numerical efforts have been performed on such conventional designs. This study introduces a new radial-flow configuration that can be employed in several novel designs. Advantages and challenges of such designs are outlined. Feasible implementations of these arrangements into gas turbine engines are shown and a new rotor speed controlling system is described, too. Keywords: radial wave rotor, comprex, internal combustion wave rotor, shock waves, gas turbine, Pezhman Akbari Michigan State University Mechanical Engineering Department 2500 Engineering Building East Lansing, Michigan 48824-1226 Phone: +1 (517) 432 1102 Fax: +1 (517) 353 1750 Email: akbari@egr.msu.edu Norbert Müller Michigan State University Mechanical Engineering Department 2455 Engineering Building East Lansing, Michigan 48824-1226 Phone: +1 (517) 432 9139 Fax: +1 (347) 412 7848 Email: mueller@egr.msu.edu INTRODUCTION The potential of unsteady-flow wave machines for performance enhancement of thermodynamic cycles has been recognized, but often neglected until recently. Shock tubes, shock tunnels, pressure exchangers, pulse combustors, pulse detonation engines, and wave rotors are the best-known wave devices developed so far. Different to reciprocating machines and turbomachinery that employ mechanical parts like pistons and blades to accomplish compression or expansion processes, unsteady-flow devices utilize compression and expansion waves for various applications. It has been proved that for the same inlet and outlet Mach numbers the pressure gain in time- dependent flow devices can be much greater than in steady flow devices [1, 2], which may be a driving reason for using unsteady wave machines. Their geometry can be very simple like that of a straight tube, since the mechanical parts only house and control the wave process. Hence their manufacturing cost can be low. In this work attention is given to wave rotor machines. 1 Copyright © 2004 by ASMEPDF Image | RADIAL-FLOW WAVE ROTOR CONCEPTS, UNCONVENTIONAL DESIGNS
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