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Discharge coefficient of an orifice jet in cross flow: influence of inlet conditions and optimum velocity ratio

Berger, Sandrine and Gourdain, Nicolas and Bauerheim, Michaël and Devillez, Sébastien Discharge coefficient of an orifice jet in cross flow: influence of inlet conditions and optimum velocity ratio. (2019) In: AIAA Aviation 2019 Forum, 17 June 2019 - 21 June 2019 (Dallas, United States).

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Official URL: https://doi.org/10.2514/6.2019-3497

Abstract

The present work aims to characterize the discharge performance of aircraft door vent flaps. For this purpose, three different configurations with increasing complexity are studied with a RANS and a LES solver. The first configuration consists of an orifice plate in a duct for which experimental pressure loss data are available in the literature. This configuration is used as a reference for the validation of the RANS and LES setups. The duct placed downstream of the orifice is then removed to produce an unconfined geometry in which the orifice jet discharges either into an open atmosphere or a transverse flow. Finally, a classic jet in cross flow is also studied. The main objective is to analyze the discharge coefficient variations depending on three key parameters: (i) the jet Reynolds number, (ii) the inlet velocity profile, and (iii) the velocity ratio between the jet and the cross flow. Results show that for cases without cross flow, the jet Reynolds number has no influence on the discharge performance whereas a steady decrease of the orifice pressure loss is observed as the duct inlet velocity profile is deformed from that of a flat profile. The Poiseuille profile is found to minimize the pressure loss. In addition, numerical data of the reference configuration compare well with experimental values when such a profile is prescribed. Finally, simulations with a cross flow evidence an optimal velocity ratio for which the discharge coefficient is maximum and exceeds the freejet value.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-02166754
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Groupe Latécoère (FRANCE)
Laboratory name:
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Deposited By: Michael Bauerheim
Deposited On:25 Jun 2019 13:57

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