Han Wei

National University of Singapore | NUS · Department of Mechanical Engineering

Traditionally, Pitot rake test models have been used to take time- and spatially resolved impact pressure measurements in impulse facilities for flow characterisation. When expansion tubes are used for the study of hypervelocity planetary entry phenomena, generally the post-shock flow in the test section strongly radiates. This paper outlines a sim...

Traditionally, expansion tube test times have been experimentally evaluated using test section mounted impact pressure probes. This paper proposes two new methods which can be performed using a high-speed camera and a simple circular cylinder test model. The first is the use of a narrow bandpass optical filter to allow time-resolved radiative emiss...

This study presents calibrated vacuum ultraviolet spectroscopic measurements and filtered cyanogen violet band images for steel, cold graphite, and preheated graphite models at three reentry-relevant conditions in the X2 Expansion Tube. An analysis of these experiments concluded that there were no unique radiating species in the boundary layer of a...

Radiative heating dominates forebody thermal loads on re-entry capsules travelling at superorbital speeds and has also recently been identified as a major component in afterbody heating. Although subjected to less severe heating, the afterbody heat shield is typically designed with a larger structural safety factor, limited by the fidelity of compu...

A superorbital reentry flow was realized in the X2 expansion tunnel of the Centre for Hypersonics of the University of Queensland, resulting in measurements of electronic excitation temperature, electron density, and particle densities of neutral and ionized atomic nitrogen and oxygen. A rectangular cold wall model was exposed to a flow correspondi...