Inverse Problem of Rocket Nozzle Throat for Estimating Inner Wall Heat Flux by Broydon-Fletcher-Goldfarb-Shanno & Conjugate Gradient Method

Khoshkam, H.; Alizadeh, M.
July 2011
International Review of Mechanical Engineering;Jul2011, Vol. 5 Issue 5, p908
Academic Journal
This study employs conjugate gradient method with adjoint Problem and variable metric method to estimate inner wall heat flux of rocket nozzle throat. Heat flux in nozzle is important since an enormous heat flux from the jet flow with high temperature can lead to the throat section increases and it leads to reduce in the nozzle thrust efficiency and Life extension of the nozzle. The accuracy of the solutions of the inverse problem is examined through three given heat fluxes with given measurement errors. The examinations show that with the BFGS and CGM method, satisfactory solutions can be obtained when the measurement errors are not large and in large error, the CGM method is more accurate than BFGS. Moreover, the results show that the applied method converge very rapidly and is not so sensitive to the measurement errors. The temperature distribution with estimate flux is too near to real temperature distribution. Therefore, methods can be used to the heat conduction problem in the nozzle.


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