In this paper the mechanism of interaction between free stream and plume behind aerospike nozzle was analyzed and then numerical analysis was carried to predict the influences of slipstream effect on aerospike nozzle performance. The flowfield of a linear aerospike was simplified to two-dimensional planar flow and second order NND scheme was used to solve two-dimensional Navier Stokes equations under ideal, perfect gas assumptions. total thirty-three cases with different freestream Mach number at different nozzle pressure ratio (NPR) were calculated to find out the relationship between the aerospike nozzle performance loss caused by slipstream effect with the flight condition (NPR and freestream Mach number). Some valuable results were summarized which would be helpful for aerospike design and performance prediction.
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