High-Speed Photography of Rapid Air Currents and Shock Waves by Means of High-Frequency High-Voltage Sparks

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 71, No. 3, pp. 178–182
Abstract: The Bömelburg, Wesks and Herzog method has been perfected for practical application in wind-tunnel work with 0.8-to 20-in. sparks. A pulse transformer of nevel design permits powers up to 40 megawatis peak during each flash at up to 50,000 controlled dischesges/soc. Higher rates are possible under free-running conditions. The discharge duration is 0.3 to 1 μsec. Strobokin-controlled ultra-rapid spark discharges at 2000 to 300,000/sec are fed into the primary of a special pulse transformer whose essential component is a laminated sheet-metal core of hypersile sheets with Hostaphan insulation. A voltage of approximately 5 ko per turn on the primary winding gives a steep voltage step-up at the secondary, which with 75 turns, for example, produces a no-load voltage of 300 kv. Owing to the short spark-discharge time, no picture blue results even at air speeds of several thousand fast per second. Although the luminance of the sparks is sufficient for high-speed photography, practical experiemer shows that their low energy does not cause thermodynamic disturbance of the airflow under observation. The lowest possible spark rate where no deionization occurs is 2000/sec. At 1-mm spark spacing, this corresponds to an air velocity of 2 m/sec, whereas the maximum spark rate of 300,000/sec at 20 mm from spark to spark corresponds to an air velocity of 6 km/sec, i.e. approximately Mach 18. Also, patierns of explosion and detonation shock waves and their subsequent eddy current: can be traced by the spark method outlined above.
Publication Date: 1962-03-01
DOI: 10.5594/J16889
ISSN: Print: 0361-4573
Link: https://doi.org/10.5594/J16889
Author(s): Frank FrüngelDr.-Ing. Frank Früngel GmbH., 400 Süldorfer Landstr., Hamburg-Rissen, Germany
Walter ThorwartDr.-Ing. Frank Früngel GmbH., 400 Süldorfer Landstr., Hamburg-Rissen, Germany
H. G. PatzkeDr.-Ing. Frank Früngel GmbH., 400 Süldorfer Landstr., Hamburg-Rissen, Germany
Copyright: © 1962 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

1. Bömelburg H. J. , Tech. Note BN-68 OSR-TN 56–38 Astia No. AD-80549 ( 1957 ), University of Maryland, College Park, Md. EXTERNAL
10. Rumpf H. , “Versuche zur Bestimmung der Teilchenbewegung in Gasstrahlen des Beanspruchungsmechanismus in Strahlmühlen,” Zeit. Chemie-Ingeniew-Technik , No. 5: 335 – 342 , 1960 . EXTERNAL
2. Weske J. R. , Tech. Note BN 128 AFOSRTN 57304 AD 154214 ( 1958 ), University of Maryland, College Park, Md. EXTERNAL
3. Herzog F. , “A new experimental approach to the analysis of compressor performance,” USAF BN 90 AFOST-TH 57–3 AD 115035 (Jan. 1957 ). EXTERNAL
4. Früngel F. , Impulstechnik , Akademische Verlagsgesellschaft Geest & Portig , K. G., Leipzig , 1960 , pp. 376 – 385 . EXTERNAL
5. Vogel J. , “Präzisionsaufnahmen schneller Luftströmungen durch quarzgesteuerte Funkenblitzfolgen,” Proc. 4th International Congress on High-Speed Photography, Verlag Dr. Othmar Helwich , Hoffmannstr. 59, Darmstadt, Germany , 1959 , pp. 267 – 276 . EXTERNAL
6. Bömetburg H. J. Weske J. R. Herzog F. , “The electric spark method for quantitative measurements in flowing gases,” Zeit, Flugwissenschaften , 7 , 1959 . EXTERNAL
7. Früngel F. , Explosivstoffe , 6 : 2 – 12 , 1958 . EXTERNAL
8. Früngel F. , Z. angew. Phys. , 8 : 86 – 90 , 1956 . EXTERNAL
9. Früngel F. , Strosstransformatoren zur Erzeugung von Hochspannungsimpulsen , Elecktrotechn. Z. (A) 81 : 355 – 360 , 1960 . EXTERNAL

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Frank Früngel, Walter Thorwart, and H. G. Patzke; High-Speed Photography of Rapid Air Currents and Shock Waves by Means of High-Frequency High-Voltage Sparks, Journal of the SMPTE ( Volume: 71, Issue: 3, March 1962); SMPTE, 1962. Available at https://doi.org/10.5594/J16889

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Frank Früngel, Walter Thorwart, and H. G. Patzke; High-Speed Photography of Rapid Air Currents and Shock Waves by Means of High-Frequency High-Voltage Sparks, Journal of the SMPTE ( Volume: 71, Issue: 3, March 1962); SMPTE, 1962. Available at https://doi.org/10.5594/J16889

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<span class="citation">Frank Früngel, Walter Thorwart, and H. G. Patzke; <cite>High-Speed Photography of Rapid Air Currents and Shock Waves by Means of High-Frequency High-Voltage Sparks</cite>, Journal of the SMPTE ( Volume: 71, Issue: 3, March 1962); SMPTE, 1962. Available at <a href="https://doi.org/10.5594/J16889" target="_blank" rel="noopener">https://doi.org/10.5594/J16889</a></span>

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Frank Früngel, Walter Thorwart, and H. G. Patzke; <cite id="bib-10-5594-j16889">High-Speed Photography of Rapid Air Currents and Shock Waves by Means of High-Frequency High-Voltage Sparks</cite>, Journal of the SMPTE ( Volume: 71, Issue: 3, March 1962); SMPTE, 1962
<span class="doi">10.5594/J16889</span>
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Referenced By

Progress Committee Report for 1962 [Active]