Hypersonic instability waves measured using fast-response heat-flux gauges

Roediger, Tim; Knauss, H.; Krämer, Ewald; Estorf, Malte; Schneider, Steven P.; Smorodsky, B. V.

doi:10.2514/6.2008-638

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…A group led by Stuttgart University in Germany has led the development of fast-response high-sensitivity heat-flux gauges [26,46]. The Atomic Layer Thermopile (ALTP) gauge uses the transverse Seeback effect in a crystal of yttrium-barium-copper oxide, as described in detail in Refs.…”

Section: Measurements Of Second-mode Instabilities Using Altp Gaugesmentioning

confidence: 99%

“…The work done under this grant is documented in a series of AIAA Papers [3,4,5,6,7,8,9,10,11,2], and other conference papers [12,13]. A series of review papers was also written, to educate a new generation of engineers not familiar with the vast Cold War literature [14,15,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…A series of review papers was also written, to educate a new generation of engineers not familiar with the vast Cold War literature [14,15,16,17]. Several of these conference papers were revised into journal papers [18,19,20,21,22,23,24,25,26]. A number of students also completed their theses [27,28,29].…”

Section: Introductionmentioning

confidence: 99%

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Towards High-Reynolds-Number Quiet Flow in Hypersonic Wind Tunnels

Schneider¹

2009

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Section: Measurements Of Second-mode Instabilities Using Altp Gaugesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Towards High-Reynolds-Number Quiet Flow in Hypersonic Wind Tunnels

Schneider¹

2009

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“…Fast response piezo-electric pressure transducers, heat-flux gauges, or hot wire anemometry techniques [8][9][10][11][12][13][14][15][16] are traditionally used for the study of the instability on a slender body in hypersonic flow; however, the high frequency (≈100 kHz to 2 MHz for conditions in T5) and small wavelength of the most strongly amplified disturbances render these techniques inadequate.…”

Section: Introductionmentioning

confidence: 99%

Differential Interferometric Measurement of Instability at Two Points in a Hypervelocity Boundary Layer

Parziale

Shepherd

Hornung

2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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The focused laser differential interferometer (FLDI) was used to investigate disturbances in a hypervelocity boundary layer on a sharp five degree half-angle cone. The T5 hypervelocity free-piston driven reflected-shock tunnel was used as the test facility; in such a facility the study of thermo-chemical/fluid-dynamic energy exchange is emphasized. Two sensitive FLDI probe volumes were aligned along a generator of the cone that recorded time-traces of density fluctuation at sufficient time resolution, spatial resolution, and signal to noise ratio, so that the boundary layer instability could be resolved. This arrangement of the FLDI allows for the interpretation of disturbances at two points and the correlation between them. The acoustic instability is detected with narrow-band peaks in the spectral response at a number of frequencies (500 kHz to 1.29 MHz). The data indicate that the instability driving the boundary layer to turbulence is acoustic in nature. Preliminary analysis indicates that there is not a significant difference between N2 and air acoustic boundary layer disturbance amplification factors for the representative cases presented. Computation of acoustic damping by thermo-chemical relaxation processes is presented for the same representative cases, and indicates that there is a negligible amount of absorption for both air and N2 at the observed disturbance frequencies.

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