Abstract
An aerospike nozzle has been expected as a candidate for an engine of a reusable space shuttle to respond to growing demand for rocket-launching and its cost reduction. In this study, the flow field structures in any cross sections around the linear-spike nozzle are visualized and analyzed, using laser induced fluorescence (LIF) of NO seeded in the carrier gas N_2. Since the flow field structure is affected mainly by pressure ratio (P_s/P_a), the liner aerospike nozzle is set inside the vacuum chamber to carry out the experiments in the wide range of pressure ratios from 75 to 250. Flow fields are visualized in several cross-sections, demonstrating the complicated three-dimensional flow field structures. Pressure sensitive paint (PSP) of PtTFPP bound by poly (TMSP) is also applied successfully to measurement of the complicated pressure distribution on the nozzle surface.
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