Abstract
Within the scope of this work, we investigate the potential of passive flow control of pseudo-shock systems via bypass mass flow through longitudinal gaps. We show that within a slender nozzle, the frequently observed symmetry breaking of pseudo-shock systems is completely suppressed by the presence of small longitudinal gaps between the sidewalls and the channel geometry. Moreover, gaps placed only on one side of the channel enforce a rearrangement of the entire pseudo-shock system and determine the orientation of the shocktrain downstream. Numerical simulations were carried out in order to clarify to what extent gaps could be used in larger nozzles (e.g. rocket nozzles) to stabilize the shocktrain at the axis and suppress dangerous side loads. Therefore, an experimental investigation of an asymmetric pseudo-shock system within a larger nozzle (Reijasse et al. 1999) is numerically reproduced to serve as exemplary test case.
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Acknowledgments
The authors thank Dr. Thomas Gawehn for the fruitful cooperation. Gruß und Kuss, dein Julius.
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Giglmaier, M., Krüger-Sprengel, M., Quaatz, J.F., Adams, N.A. (2017). Passive Flow Control in Laval Nozzles Due to Bypass Mass Flow in Narrow Longitudinal Gaps. In: Ben-Dor, G., Sadot, O., Igra, O. (eds) 30th International Symposium on Shock Waves 1. Springer, Cham. https://doi.org/10.1007/978-3-319-46213-4_20
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DOI: https://doi.org/10.1007/978-3-319-46213-4_20
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