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Figure 15: Aerodynamic control of the rotational speed hit between both in the case of too low rotational speed. The pressure ratio across the shock wave will then induce a jet coming out of the channel exit in rotational direction and accelerates the rotor with its momentum. For deceleration the same principle is applied in the bottom part of Fig. 15 using a secondary shock wave that should arrive at the opposite end plate at the trailing edge of the high pressure inlet port. The passage outlet is directed against the rotational direction. This principle is envisioned more for speed control rather than for a primary drive of the rotor. For the latter it is probably less effective than other driving principles including those of a self-driving rotor. However, it may allow removing all pockets, even though it may be used in combination with other active or passive control mechanisms. CONCLUSION Radial wave rotor (wave disc) is an important step forward for wave rotor technology. Unlike existing axial-flow wave rotors, a radial wave rotor has radial channels where the flow enters and leaves the channels radially. Its unique features can improve the compression process, flow scavenging, and phase separation. The manufacture process sounds easier as well. The stacked discs configuration allows a more sophisticated application for radial wave rotors, especially for gas turbine applications. Being able to embed the compressor inside the wave discs, the overall dimensions can be reduced. The active aerodynamic speed control suggested here allows maintaining a preferred wave pattern by changing the rotor rotational speed which is very beneficial in operating conditions of wave rotors. REFERENCES [1] Weber, H. E., 1986, “Shock-Expansion Wave Engines: New Directions for Power Production,” ASME Paper 86-GT- 62. [2] Weber, H. E., 1995, Shock Wave Engine Design, John Wiley and Sons, New York. [3] Gyarmathy, G., 1983, “How Does the Comprex Pressure-Wave Supercharger Work?,” SAE Paper 830234. [4] Kentfield, J. A. C., 1993, Nonsteady, One-Dimensional, Internal, Compressible Flows, Oxford University Press, Oxford. [5] Zehnder, G., Mayer, A. and Mathews, L., 1989, “The Free Running Comprex®,” SAE Paper 890452. [6] Hiereth, H., 1989, “Car Tests With a Free-Running Pressure-Wave Charger - A Study for an Advanced Supercharging System,” SAE Paper 890 453. [7] Okamoto, K., Nagashima, T., and Yamaguchi, K., 2003, “Introductory Investigation of Micro Wave Rotor,” 2003 International Gas Turbine Congress, ASME Paper IGTC03-FR- 302, Japan. [8] Iancu, F., Akbari, P., and Müller, N., 2004, “Feasibility Study of Integrating Four-Port Wave Rotors into Ultra-Micro Gas Turbines,” AIAA Paper 2004-3581. [9] Meyer, A., 1947, “Recent Developments in Gas Turbines,” Journal of Mechanical Engineering, 69, No. 4, pp. 273-277. [10] Akbari, P., Müller, N., 2003, “Performance Improvement of Small Gas Turbines Through Use of Wave Rotor Topping Cycles,” 2003 International ASME/IGTI Turbo Exposition, ASME Paper GT2003-38772. [11] Akbari P., Müller, N., 2003, “Performance Investigation of Small Gas Turbine Engines Topped with Wave Rotors,” AIAA-Paper 2003-4414. [12] Taussig, R. T., Hertzberg, A., 1984, “Wave Rotors for Turbomachinery,” Winter Annual Meeting of the ASME, edited by Sladky, J. F., Machinery for Direct Fluid-Fluid Energy Exchange, AD-07, pp. 1-7. [13] Shreeve, R. P., Mathur, A., 1985, Proceeding ONR/NAVAIR Wave Rotor Research and Technology Workshop, Report NPS-67-85-008, Naval Postgraduate School, Monterey, CA. 14] Paxson, D. E., 1992, “A General Numerical Model for Wave-Rotor Analysis,” NASA TM-105740. [15] Paxson, D. E., 1996, “Numerical Simulation of Dynamic Wave Rotor Performance,” Journal of Propulsion and Power, 12, No. 5, pp. 949-957. 9 Copyright © 2004 by ASMEPDF Image | RADIAL-FLOW WAVE ROTOR CONCEPTS, UNCONVENTIONAL DESIGNS
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