Designing an axisymmetric aerospike nozzle based on modified MOC

This study provides a direct method based on the method of characteristics with assumptions of non-viscous flow and thermally perfect gas to design an axisymmetric plug nozzle. Inputs for numeric code include output Mach number, specific heat ratio, global gas constant, and a number of discrete step...

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Bibliographic Details
Published inScientia Iranica. Transaction B, Mechanical engineering Vol. 26; no. 2; pp. 834 - 842
Main Authors Masdari, M, Tahani, M, Fard, F Mohammadi
Format Journal Article
LanguageEnglish
Published Tehran Sharif University of Technology 01.04.2019
Subjects
Error detection
Exhaust nozzles
Geometry
Ideal gas
Inviscid flow
Mach number
Manufacturing
Method of characteristics
Nozzles
Numerical analysis
Plug nozzles
Prandtl-Meyer expansion
Reduction
Rockets
Studies
Symmetry
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Summary:This study provides a direct method based on the method of characteristics with assumptions of non-viscous flow and thermally perfect gas to design an axisymmetric plug nozzle. Inputs for numeric code include output Mach number, specific heat ratio, global gas constant, and a number of discrete steps of Prandtl-Meyer expansion fan. In the design process, no simplification was made and only unique spike geometry was created. Based on the criterion that locates the tip of the spike on the axis of symmetry, for each output Mach number, a correction factor was extracted which is the sole source of theoretical errors. The studied parameters include spike geometry, parallelism of exhaust nozzle flows and uniformity. Based on the numerical analysis, obtained results are consistent with desired output Mach number, and output flow is parallel to the axis of symmetry. A simple and direct formulation was used which performed very fast. Due to the error detected, which resulted in the surface slope reduction factor, some movement in spike geometry relative to ideal conditions was raised. Thus, the effect of a reduction factor may tend to zero by increasing the design Mach number.
DOI:10.24200/sci.2018.5065.1072