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Hartung, L. C.

Publications and source records attributed to Hartung, L. C..

4 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1986

Use of hot-wire anemometry for turbulence measurements in shock induced flows

A research program is currently being conducted with the aim to investigate the operating environment of future gas turbines. The present paper provides a description of the experimental methods which have been employed in performing turbulence intensity measurements in shock-induced flows. In a discussion of the instrumentation, attention is given to the employed low pressure shock tube, the hot-wire probe, the anemometer, the test facility, the experimental setup, the Kistler pressure transducer, and silicon piezoresistive gages. Aspects of instrumentation calibration are considered along with data corrections, experimental data, and data processing.

Hartung, L. C.↗
NASA NTRS1984

Analysis of entry aerodynamic heat-transfer data for the orbiter wing lower surface

Flight-derived aerodynamic heat-transfer data for the orbiter wing lower surface, from STS-2, -3, and -5, are presented and compared with both ground-based experimental results and state-of-the-art computational flowfield results for a nominal angle of attack of 40 degrees. The flight data clearly show the development of the interference heat-transfer region on the wing lower surface resulting from the downstream effects of the bow-shock/wing-shock interaction. The location of the interference heating region is well correlated with a region of minimum static enthalpy near the boundary-layer edge as predicted by a 3-dimensional, inviscid flowfield computation. The magnitude of the interference heat transfer is no greater than the undisturbed laminar heat transfer which occurs during the 'peak aerodynamic heating' portion of entry.

Throckmorton, D. A.↗
NASA NTRS1984

Computer graphic visualization of orbiter lower surface boundary-layer transition

Computer graphic techniques are applied to the processing of Shuttle Orbiter flight data in order to create a visual presentation of the extent and movement of the boundary-layer transition front over the orbiter lower surface during entry. Flight-measured surface temperature-time histories define the onset and completion of the boundary-layer transition process at any measurement location. The locus of points which define the spatial position of the boundary-layer transition front on the orbiter planform is plotted at each discrete time for which flight data are available. Displaying these images sequentially in real-time results in an animated simulation of the in-flight boundary-layer transition process.

Throckmorton, D. A.↗