CUED Publications database

Numerical investigation of boundary layers in wet steam nozzles

Starzmann, J and Hughes, FR and White, AJ and Grübel, M and Vogt, DM (2016) Numerical investigation of boundary layers in wet steam nozzles. In: UNSPECIFIED.

Full text not available from this repository.

Abstract

© Copyright 2016 by ASM. Condensing nozzle flows have been used extensively to validat wet steam models. Many test cases are available in th literature and in the past a range of numerical studies have deal with this challenging task. It is usually assumed that the nozzle provide a one-or two-dimensional flow with a fully turbulen boundary layer. The present paper reviews these assumption and investigates numerically the influence of boundary layers o dry and wet steam nozzle expansions For the narrow nozzle of Moses and Stein it is shown that th pressure distribution is significantly affected by the additiona blockage due to the side wall boundary layer. Comparison o laminar and turbulent flow predictions for this nozzles suggest that laminar-Turbulent transition only occurs after the throat Other examples are the Binnie nozzle and the Moore nozzles fo which it is known that sudden changes in wall curvature produc expansion and compression waves that interact with the boundar layers. The differences between two-and three-dimensiona calculations for these cases and the influence of laminar and turbulen boundary layers are discussed The present results reveal that boundary layer effects cahave a considerable impact on the mean nozzle flow and thu on the validation process of condensation models. In order t verify the accuracy of turbulence modelling a test case that i not widely known internationally is included within the present.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:10
Last Modified: 17 Aug 2017 01:25
DOI: