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http://dx.doi.org/10.5855/ENERGY.2012.21.3.237

Influence of a isolator in supersonic nozzle on thermal choking  

Kim, Sangwoo (Korea Institute of Science and Technology Information)
Kim, Youngcheol (Korea Institute of Science and Technology Information, Reseat Program)
Kim, Jangwoo (Department of Digital Display Engineering, Hoseo University)
Publication Information
Journal of Energy Engineering / v.21, no.3, 2012 , pp. 237-242 More about this Journal
Abstract
This study presents numerical solutions of the two-dimensional Navier-Stokes equations for supersonic unsteady flow in a convergent-divergent nozzle with a isolator. The TVD scheme in generalized coordinates is employed in order to calculate the moving shock waves caused by thermal choking. We discuss on transient characteristics, unstart phenomena, fluctuations of specific thrust caused by thermal choking and effects of isolator. The adverse pressure gradient caused by heat addition brings about separation of the wall boundary layers and formation of the oblique shock wave that proceed to upstream. The proceeding speed of the oblique shock wave to upstream direction for the convergent-divergent nozzle with isolator is lower than that for the nozzle without isolator.
Keywords
Supersonic flow; Adverse pressure gradient; Thermal choking; Isolator; Engine unstart;
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