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Figure 5: Radial-flow wave rotor with curved channels curved channels provide a greater length for the same disc diameter, which can be important to obtain certain wave travel times for tuning. With curved channels also the angle against the radius can be changed freely. This allows modulating of the inflow direction acting accelerating component of the centrifugal force (see Fig. 6) and also to choose the inlet and outlet angle independently. The latter enables independent matching with the flow direction through the stationary inlet and outlet ports or the use of a freely chosen incidence angle Figure 7: Relative position of turbo-compressor with respect to a wave disc Figure 6: Centrifugal acceleration in straight and curved channels of radial wave rotors for a self-driving configuration. Furthermore, curved channels may be more effective for self- propelling and work extraction in the case of a wave turbine or work input for additional compression, analogous to the principle of turbomachines. For gas turbine applications, the compressor and turbine can remain as a unit as shown in Fig. 7 with its axis perpendicular to the wave disc. However the angle can be arbitrary. Radial Internal Combustion Wave Rotor Positioning the combustion process internally in the wave rotor can simplify the porting enormously. Furthermore, an internal combustion configuration is especially attractive for a radial wave rotor in a gas turbine. In such an envisioned configuration, the pre-compressed air from the compressor enters the wave disc through the inner end plate ports and through the outer end plate ports the flow is then directed to the turbine, allowing still a relative positioning as shown in Fig. 7. The internal flow and combustion process in a wave disc is shown schematically in Fig. 8 for a disc with curved channels. The fuel supplies (green) are located at the inner inlet port. The mixture in the channel is then ignited by either a stationary igniters that act through holes in the channel (yellow in the middle of the channel) or by rotating electrical igniters that are activated only in a certain angular position of the mixture filled channel. It is possible to radially stratify the air-fuel mixture 5 Copyright © 2004 by ASMEPDF Image | RADIAL-FLOW WAVE ROTOR CONCEPTS, UNCONVENTIONAL DESIGNS
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