Theory and experiments for detecting shock locations

S. I. Hariharan; David K. Johnson; Grigory Adamovsky

doi:10.1117/12.171292

18 March 1994 Theory and experiments for detecting shock locations

S. I. Hariharan, David K. Johnson, Grigory Adamovsky

Proceedings Volume 2122, Laser Applications in Combustion and Combustion Diagnostics II; (1994) https://doi.org/10.1117/12.171292
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We present a simplified 1D theory for detecting locations of normal shocks in a converging- diverging nozzle. The theory assumes that the flow is quasi 2D and the flow is accelerated in the throat area. Optical aspects of the model consider propagation of electromagnetic fields transverse to the shock front. The theory consists of an inverse problem in which it reconstructs from the measured intensity an index of refraction profile for the shock. From this profile and the Dale - Gladstone relation, the density in the flow field is determined, thus determining the shock location. Experiments show agreement with the theory. In particular, the location is determined within 10 percent of accuracy. Both the theoretical as well as the experimental results are presented to validate the procedures in this work.

Citation Download Citation

S. I. Hariharan, David K. Johnson, and Grigory Adamovsky "Theory and experiments for detecting shock locations", Proc. SPIE 2122, Laser Applications in Combustion and Combustion Diagnostics II, (18 March 1994); https://doi.org/10.1117/12.171292

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