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Computational Investigation of Pintle Nozzle Flow  

Kim, Joung-Keun (국방과학연구소 1기술본부 6부)
Lee, Ji-Hyung (국방과학연구소 1기술본부 6부)
Chang, Hong-Been (국방과학연구소 1기술본부 6부)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.13, no.2, 2009 , pp. 35-41 More about this Journal
Abstract
Both the nozzle expansion ratio and the chamber pressure are simultaneously and continuously changed according to pintle movement, resulting in a different internal flow structure and flow separation characteristics. In this paper, the pintle position effect on nozzle flow structure and separation phenomena is analyzed by experimental-aided Computational Fluid Dynamic(CFD). Among the turbulent models for RANS(Reynold Averaged Navier Stokes) in Fluent, Spalart-Allmaras model is better agreement with the nozzle wall pressure distribution attained by cold-flow test than other models. And even if a conical nozzle is used, there is a shock structure similar to cap-shock pattern mainly occurred in contoured or shaped optimized nozzle because of internal shock generated from pintle tip flow separation.
Keywords
Pintle; Flow separation; Conical Nozzle;
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