A Multi-Disciplinary Optimization Method for Multi Nozzle Grid (MNG) Design - Final Report

The design procedure of Multi Nozzle Grid (MNG) has become possible with the viscous losses value obtained in a series of characterization testing. These tests were conducted using hybrid-liquid/solid motor configurations in which a single nozzle was replaced by a shorter MNG plate to improve the performance of the hybrid's flight configuration. A single nozzle that shares the same scaled nozzle contour and overall throat area as well as exit area is called an Equivalent Single Nozzle (ESN). The MNG configuration includes 85 nozzlettes all having the scaled-down contour as that of the ESN. Since the tests were static with no need for flight worthy hardware, the resulting ESN is quite heavy. Data from three MNG hot-firings tests were compared to data from a single hot-fire test of the ESN to quantify the viability and advantages of the MNG. The results show that viscous losses in the flow through the MNG drop the efficiency by 3% vs. that of the ESN. But when compared to a Conventional Single Nozzle (CSN) commonly used in air vehicles, the MNG system may improve performance by more than 11% due to length and mass saving.

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A Multi-Disciplinary Optimization Method for Multi Nozzle Grid (MNG) Design - Final Report

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Rocket nozzles: 75 years of research and development

Rocket nozzles: 75 years of research and development

Viscous losses of MNG in Hybrid Motor Tests

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