First Experiments and Commissioning of the ORCHID Nozzle Test Section

Conference Paper (2021)
Author(s)

Fabio Beltrame (TU Delft - Flight Performance and Propulsion)

Adam J. Head (TU Delft - Flight Performance and Propulsion)

C.M. de Servi (TU Delft - Flight Performance and Propulsion, Vlaamse Instelling voor Technologisch Onderzoek)

M Pini (TU Delft - Flight Performance and Propulsion)

F.F.J. Schrijer (TU Delft - Aerodynamics)

P Colonna (TU Delft - Flight Performance and Propulsion)

Research Group
Flight Performance and Propulsion
Copyright
© 2021 F. Beltrame, A.J. Head, C.M. de Servi, M. Pini, F.F.J. Schrijer, Piero Colonna
DOI related publication
https://doi.org/10.1007/978-3-030-69306-0_18
More Info
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Publication Year
2021
Language
English
Copyright
© 2021 F. Beltrame, A.J. Head, C.M. de Servi, M. Pini, F.F.J. Schrijer, Piero Colonna
Research Group
Flight Performance and Propulsion
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. @en
Pages (from-to)
169-178
ISBN (electronic)
978-3-030-69306-018
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Abstract

This paper reports one of the initial NICFD experiments in the nozzle test section of the ORCHID aimed at providing accurate data for the validation of flow solvers, albeit, at this stage of the research, the focus is limited to inviscid phenomena. Notably, a series of schlieren photographs displaying Mach waves in the supersonic flow of the dense vapor of siloxane MM were obtained and are documented here for the commissioning experiment, namely, for inlet conditions corresponding to a stagnation temperature and pressure of T0=252∘C and P0=18.4bara. At these inlet conditions the compressibility factor of the fluid is Z0= 0.58. The digital processing of the schlieren images allowed to estimate multiple angles formed by the Mach waves stemming from the upper and lower nozzle surfaces because of the infinitesimal density perturbations generated by the, albeit small, roughness of the metal surfaces. These values are related to the local Mach number by a simple geometric relation. Moreover, the total expanded uncertainty in the Mach number was computed. This information together with the estimate of the average Mach number was used for a first assessment of the capability of evaluating NICFD effects occurring in a dense organic vapor flow of MM by comparison with the results of CFD simulations. The outcome of the comparison was satisfactory. It can thus be inferred that the nozzle test section has been commissioned and it is ready for experimental campaigns in which its full potential in terms of measurements accuracy, repeatability, and operational flexibility will be exploited.

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