Title: Analysis of In-Flight Behavior of Truncated Plug Nozzles
Abstract: Plug nozzles are usually designed to achieve altitude adaptation in a wide range of chamber/ambient pressure ratios.In actual in-e ight operationsofplug nozzles, this phenomenon musttakeplacein a e owing airstream,which can affect the performance. To understand the e ow behaviorin such conditionsand to evaluate the departure from the ideal nozzle performance, an investigation is carried out with a validated numerical tool based on the solution of turbulent Navier ‐Stokes equations and on shock e tting. A sample rocket plug nozzle is analyzed parametrically to evaluate the effect of varying Mach number at constant pressure and the effect of varying pressure ratio at constant Mach number. The results indicate that the interaction with a e owing airstream reduces the pressure of the external air, as seen from the nozzle exhaust jet, yielding a reduction of the performance. In particular, a dramaticdecrease of nozzleperformance may takeplacein the transonicregion iftheslipstream effect is neglected in thedesign. Theresults also provide useful indications on how the Mach numberand the shroud shapecan affect the value of ambient pressure where the transition from open to closed wake takes place.
Publication Year: 2001
Publication Date: 2001-07-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 41
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