Free-Flight Aerodynamic Testing of the Skylon Space Plane

Abstract

The determination of aerodynamic coefficients for complex high speed vehicles still requires experimental measurement. This paper details the development of the free-flight measurement technique within the University of Oxford High Density Tunnel (HDT). In particular, a novel image processing technique is developed for calculating the position of the model from high speed video. This study focusses on the measurement of high Reynolds number experimental aerodynamic data for a subscale model of Reaction Engines' Skylon spaceplane. Testing was undertaken at a Mach 7 test condition replicating flight at an altitude of 63.5 km. Results for lift, drag and pitching moment coefficient were obtained over a range of angles of attack.

Integration of Arc-jet in Impulse Facility for Hypervelocity Aerothermal Testing with Ablation

“…The test model is on rail, bounded by two vertical shafts. The traverse methodology was adapted from the free-flight model drop mechanism in the reference [48]. Then, both the test model and model movement support get directly exposed to the hypersonic flow from the expansion tube.…”

Laser-Induced Diaphragm Rupture for Improved Sequencing and Repeatability in a Hypersonic Facility

“…The Hypersonic Ludwieg Tube Braunschweig (HLB) operates using a valve with a downstream-facing seat [4] whereas the Oxford High Density Tunnel (HDT) operates with an upstream-facing valve seat [5]. The transient filling and discharge of the plenum chamber which is positioned between the valve and the nozzle throat in the HDT facility induces an unsteady flow start-up period of about 40 ms [6]. In the case of the HLB facility, vorticity in the valve wake convects through the nozzle and has a measurable effect on the flow quality: a cone probe with a PCB pressure sensor registered nRMS-values about 30 % higher on centre line relative to values at between 100 mm to 150 mm radius [7].…”