Numerical investigations of relaminarization in scramjet flows

The numerical investigations of relaminarization using statistical turbulence models are presented. The goal is to identify suitable models that can be used in the design and development process of a 3D scramjet inlet by means of numerical methods. The computations were performed using a well-validated in-house finite volume flow solver. Two baseline turbulence models were considered and several modifications were proposed and tested within the scope of this work. It was revealed that common turbulence models are able to predict the mean flow field sufficiently accurate. This is because turbulence is reduced across the expansion region and therefore, the flow is mainly pressure-driven. Thus, the accuracy of the turbulence models is less important. Furthermore, the production term plays a dominant role in the transport equations of the Reynolds stresses while the other terms are either less sensitive to the distortion or negligible. It is recommended that the Reynolds stress model is the most suitable turbulence model for this type of flow since it contains the exact production of the Reynolds stresses. For engineering applications, eddy viscosity models may also be employed with some caution. In addition, several 3D computations were performed for three different scramjet inlets in which several numerical and physical phenomena were examined. These include examining the importance of compressibility effects, investigating the effects of sidewall compression and relaminarization on the performance of a 3D inlet and simulating a new optimized inlet. This work represents a contribution to understanding the predictive capability of turbulence models and to designing and developing a scramjet demonstrator.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2012

Author dc:creator

• Nguyen, Tran Quang Tue

Contributors dc:contributor

• Behr, Marek

• info:eu-repo/classification/ddc/620
• Überschallstaustrahltriebwerk
• Hyperschallströmung
• Ingenieurwissenschaften
• Relaminarisierung
• Scramjet-Einlauf
• CFD
• relaminarization
• scramjet
• hypersonic

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-112691%22

OAI record oai:identifier

https://publications.rwth-aachen.de/oai2d?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Apublications.rwth-aachen.de%3A50136