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Experimental study of moving throat plug in a shock tunnel

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Abstract

An experimental study has been carried out to investigate the flow in the KAIST shock tunnel with two moving throat plugs at a primary shock velocity of 1.19 km/s. The nozzle reservoir pressure and the Pitot pressure at the exit of the nozzle were measured to examine the influence of the moving throat plugs on the shock tunnel flow. To assess the present experimental results, comparisons with previous work using a stationary throat plug were made. The mechanism for closing the moving throat plug was developed and verified. The source of the force to move the plug was the pressure generated when the primary shock was reflected at the bottom of the plug. It was observed that the two plugs terminated the shock tunnel flow after the steady flow. .The time for the plugs to terminate the flow showed good agreement with the calculation of the proposed simple analytic solution. There was a negligible difference in flow values such as the reflected pressure and the Pitot pressure between the moving and the stationary plugs.

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Acknowledgments

This research was supported by the Ministry of Education, Science and Technology of Korea under the Space Core Technology Development Program (No. 2011-0020808). The authors would like to express their sincere thanks to Dr. Gisu Park in KAIST for technical assistance in conducting the shock tunnel experiments.

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Authors and Affiliations

  1. Wind Tunnel Testing Laboratory, Agency for Defense Development (ADD), Daejeon, Korea

    J. K. Lee

  2. Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea

    C. Park & O. J. Kwon

Authors
  1. J. K. Lee
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  2. C. Park
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  3. O. J. Kwon
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Corresponding author

Correspondence to J. K. Lee.

Additional information

Communicated by D. Ranjan.

This paper is based on work that was presented at the 29th International Symposium on Shock Waves, Madison, Wisconsin, USA, July 14–19, 2013.

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Lee, J.K., Park, C. & Kwon, O.J. Experimental study of moving throat plug in a shock tunnel. Shock Waves 25, 431–442 (2015). https://doi.org/10.1007/s00193-015-0573-4

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  • DOI: https://doi.org/10.1007/s00193-015-0573-4

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