During recent tests in the Transonic Wind Tunnel (TWT) employing ARA’s unique Gust Rig, a novel measurement technique was developed to accurately capture the high speed deformation of the wing structure due to the rapidly varying aerodynamic loads.
This system extends the existing Model Deformation Measurement (MDM) capability provided by LaVision GmbH to incorporate the use of two Vision Research Inc. Phantom v1610 high speed cameras.
The lecture programme for the Bedford Branch of the Royal Aeronautical Society has been announced for the 2017-18 period. Lectures are held in the ARA Sports & Social Club and cost £2 for non-members or free to members.
ARA will be attending at the AIAA Aviation Forum and Exposition in Denver, Colorado and will be presenting at the 3rd AIAA CFD High Lift Prediction Workshop on Saturday 3rd June at 1000. Peter Risley-Settle will showcase CFD results using the ARA Solar meshing tool and TAU flow solver from DLR.
During the recent miniPSP test entry at ARA the images collected allowed the surface pressure contours over a portion of the ARA reference model wing to be measured. As this wing was relatively highly pressure plotted the PSP data recorded could be calibrated and the post-processing would provide surface contours of the absolute static pressure over the measurement region.
ARA has successfully conducted multiple trials of technology aimed at the miniaturisation of the installation footprint of Pressure-Sensitive Paint systems. This project (miniPSP) has been funded by Innovate UK under the HITEA III framework, where ARA was partnered with the University of Manchester. The most recent trial demonstrated the use of a sub-miniature camera, embedded within a fuselage blister, to measure the surface pressure profile over a section of a wing. Further trials have been conducted which demonstrate the feasibility of such systems for the measurement of pressures within internal model ducts and cavities, along with the potential for use with Model Deformation Measurement Systems and for oil flow visualisations. A final report describing the miniPSP development will be published at the end of the project (June 2017). For more information please contact email@example.com.
In line with customer demands ARA has developed and successfully trialled the use of fluorescent oil flow mixtures for highly detailed surface flow investigations. The viscosity and volatility of the mixtures are specific to the target speed range and provide the potential for full model coverage. These techniques are suitable for use in the investigations of various properties not limited to: shock locations, separation regions, vortex footprints, and internal flows. Images can be taken both during the run as the flow system develops (fig 1a, b) and post-run once the patterns have been set (fig 2a, b, c). This technique provides a higher resolution of the surface streak lines when compared to standard multi-coloured/point oil flow techniques.