Effects of rarefaction and thermal non-equilibrium on a blunt body and a bicone in hypersonic flow and their shape optimization for reducing both drag and heat transfer

Samuel T. Gardner, Ramesh K. Agarwal

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Design of space vehicles poses technical challenges at hypersonic speeds since they need to travel through different flow regimes due to density changes in the atmosphere with altitude. Some key characteristics associated with hypersonic flow include very high temperatures and heat transfer to the wall. At these temperatures, the assumption of thermal equilibrium is no longer valid and the effect of rotational non-equilibrium should be included in modeling of diatomic gas flow. This paper employs the Navier-Stokes equations, which are modified to include a rotational non-equilibrium relaxation model to analyze the heat transfer, drag, and shock standoff distance for hypersonic flow past a blunt body and a bicone for various levels of rarefaction. The customized flow solver, ZLOW, is used to compute the solutions. The effects of rarefaction are modeled by applying Maxwell's velocity slip and temperature jump boundary conditions on the body surface. In addition, both the blunt body and bicone shapes are optimized in hypersonic rarefied flow with rotational non-equilibrium by using a multi-objective genetic algorithm (MOGA) for reduction of both drag and heat transfer.

Original languageEnglish
Title of host publication31st International Symposium on Rarefied Gas Dynamics, RGD 2018
EditorsDuncan Lockerby, David R. Emerson, Lei Wu, Yonghao Zhang
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735418745
DOIs
StatePublished - Aug 5 2019
Event31st International Symposium on Rarefied Gas Dynamics, RGD 2018 - Glasgow, United Kingdom
Duration: Jul 23 2018Jul 27 2018

Publication series

NameAIP Conference Proceedings
Volume2132
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference31st International Symposium on Rarefied Gas Dynamics, RGD 2018
Country/TerritoryUnited Kingdom
CityGlasgow
Period07/23/1807/27/18

Fingerprint

Dive into the research topics of 'Effects of rarefaction and thermal non-equilibrium on a blunt body and a bicone in hypersonic flow and their shape optimization for reducing both drag and heat transfer'. Together they form a unique fingerprint.

Cite this