Patent ID: 9009966
Filing Date: 2015-04-21
Classification: F02K,Y10T

Abstract:
1. A method of designing an internal/external single expansion ramp nozzle (nxSERN) comprising: a. selecting SERN design parameters for nozzle primary stream throat height, nozzle pressure ratio and nozzle internal expansion ratio; b. determining additional nozzle primary stream SERN parameters from isentropic relationships using the selected SERN design parameters and a Prandtl-Meyer function; c. determining a nozzle primary stream throat input angle at A080; d. determining a nozzle primary stream throat output angle at A081; e. connecting the nozzle primary stream throat input angle at A080 and the nozzle primary stream throat output angle A081 by a constant radius arc to define an initial portion of a nozzle primary stream lower expansion surface; f. defining a nozzle primary stream system upper expansion surface using MoC; g. defining an aft portion of the primary stream lower expansion surface, using MoC; and h. connecting the initial and aft portions of the primary stream lower expansion surface by a straight line.