Abstract

A numerical study is carried out to investigate the effect of truncation on flow phenomena such as separation and shock patterns using axisymmetric two-dimensional model of truncated ideal contour nozzle with different lengths. Three cases are considered with a nozzle of design Mach number 5.15 truncated to three different lengths. Flow characteristics are analyzed for nozzle pressure ratios (NPR) ranging from 10 to 60 and the results are compared for different lengths. The comparison shows that, at low NPRs, when the separation position is near the throat area, separation is unaffected by the truncation. As the separation positions move toward the nozzle exit, an increase in NPR results only in compression of the separation zone. The variations in flow structure and shock patterns are analyzed for a varying range of pressure ratios for all nozzle length which can be co-related to side-loads. The results of numerical study confirm previous experimental results.

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