题目：Measurement of radiative heat transfer to a Titan aerocapture scaled vehicle in expansion tubes
报告人：Hadas Porat
时间：7月25日下午2:30
地点：力一楼328
Abstract：
Expansion tunnels are being used to simulate atmospheric entry conditions into Titan.New conditions for peak heat transfer at the stagnation point with 6.5km/s shock velocity were developed using in-house 1D CFD code. Radiative heat flux will be measured using emission spectroscopy and radiation gauges. Emission spectroscopy provides information about the radiating species in the shock layer, and radiation gauges measure radiative heat flux on the surface of the scaled capsule. The aim is to improve the poor derstanding and large uncertainties (in excess of 30%) associated with the prediction of radiative heat flux at atmospheric entry. In a Titan atmospheric entry radiative heating accounts
for a large percentage of the total heat load. A major contribution to this is the carbon content in Titan’s atmosphere, in the form of methane. Upon atmospheric entry the methane dissociate in the bow shock layer that envelopes the spacecraft, and recombine with atmospheric nitrogen to form cyanogen. Cyanogen is expected to produce 99% of the radiation in the shock layer, and this will be verified by emission spectra recorded in the experiments. The radiation gauges consist of thin film heat gauge sensor mounted behind a viewing window, separating convective heating from the measured radiative heating. An optical set up consisting of a set of convex lenses will be used to calibrate the
radiation gauges against a known collimated LED (270W, 385nm).
报告人简介：
Education:PhD, Aerospace Engineering (10-now) Centre for Hypersonics, The University of Queensland, Australia 'Measurement of radiative heat transfer to a Titan aerocapture scaled vehicle in expansion tubes' MEng, Aerospace Engineering (05- 09), 1st Class Honours University of Hertfordshire, UK 2nd–4th Year Technion Israel Institute of Technology, Israel 1st Year Pre-Academic Studies, Science Track, Physics (03-04) The Hebrew University of Jerusalem, Israel, Graduated with excellence Matriculation Certificate (Bagrut), cientific Track, Physics (96-00) Kugel High School, Israel Work Experience Laboratory tutor and organizer (Australia) 2011 The University of Queensland Course: Structures Tutor (Australia) 2010 The University of Queensland Course: Flight Mechanics Student Engineer, Luton (UK) 2007, 6 weeks contract Hayward Tyler Ltd Working under 'Engineered Products' on a Sub-Sea motor project, my responsibility was to program the data acquisition software ' Dasylab' to be used in a series of experiments on a test rig. Restoration Volunteer, Hertfordshire (UK) 2007-2009 'de Havilland Aircraft Heritage Centre' Compulsory Military Service (Israel) 2000-2003 Artillery Crops, MLRS (Multi Launch Rocket System) MLRS Command Center Commander Boot Camp Commander