Atmospheric Crosswind Tests of Aspirated Jet Engine Intake Models

Abstract

The "Technische Universität Braunschweig" has commissioned a Propulsion Test Facility (PTF) for aspirated intake models of jet engines under off-design point conditions. For the commissioning of the unique facility, an aspirated intake test campaign has been carried out. Aim of the campaign was to compare the measured data in the PTF to numerical results and experimental data, which have already been measured in another test facility in the past using the same intake geometry. For the tests the Laminar Flow Reynolds Action (LARA) nacelle has been chosen. The LARA intake has been built and tested in the early 1990s at the "ONERA F1" wind tunnel during the work on hybrid laminar flow technology. At TU Braunschweig an Aspirated-Intake-Rig (ASI-Rig) with an in-house designed fan stage was worked out, whose fan is located far enough downstream to avoid interaction with the nacelle. For the results, the static pressure distribution at the inner and outer contour of the nacelle lip and the velocity distribution in the fan face during pure crosswind conditions have been compared and analysed. As seen in the results, the PTF pressure distribution at the lip is in good agreement with the numerical and the experimental data from the ONERA. Of particular note is the deviation between the achieved peak Mach number between the two experimental setups, analysed at the 0 • /180 • and 90 • section, which can be explained by the Reynolds number effect.

Simulation of Atmospheric Boundary Layer for Air Inlet Testing in Crossflow

“…The ABL grid is now available for customers and researchers testing in the F1 wind tunnel to represent the engine inlet in crossflow in ground effect. This new device is expected to help improve the prediction of air inlet performance in crossflow and ground effect situations, which are topics that still attracts significant experimental attention [35]. Fig.…”

Development of Aspirated Ultra-Short Intakes for Aerodynamic Off-Design Analysis

“…The innovative design concept of the PTF reverses test strategy to take this into account. As presented in [Krone and J.Friedrichs (2014) and Krone et al (2019)], driving the flow around a test vehicle through the combination of headwind and crosswind ducts, leads to an equivalent aerodynamic result such as that obtained by installing the test vehicle with a fixed geometric angle. As was done for the LARA-intake in Raynal (1994).…”