High-speed time-resolved color schlieren visualization of shock wave phenomena

Kleine, H.; Hiraki, Koju; Maruyama, Hirotaka; Hayashida, Tomohiro; Yonai, Jun; Kitamura, Keiichi; Kondo, Yasushi; Etoh, Takeharu

doi:10.1007/s00193-005-0273-6

Cited by 31 publications

(14 citation statements)

References 12 publications

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“…The frequency of this periodical flow pulsation depends, for a given Mach number, only on the length of the spike. This process resembles in many aspects the one shown and described in [10] for a double cone. …”

Section: Flat Disk With Spikementioning

confidence: 89%

“…The main difference between the new prototype and the older one described in [5] is the considerably higher resolution (300 000 pixels as opposed to 80 000) and the larger number of frames (144 vs. 100) [3], [4]. Both instruments have in common an In-Situ Storage Image Sensor (ISIS) CCD chip [3], [4], [10] which allows one to achieve frame rates in the MHz range without sacrificing image resolution. The latter aspect is the main difference between these cameras and other commercially available high-speed video systems except for the (monochrome) Shimadzu HPV-1, which is also based on the ISIS sensor technology.…”

Section: Ultrahigh-speed Video Cameramentioning

confidence: 93%

“…An earlier version, based on the commercially available monochrome high-speed camera HPV-1 built by Shimadzu, had already been applied in another preliminary set of tests which achieved the first MHz-range timeresolved color schlieren visualization of shock wave phenomena [10]. The main difference between the new prototype and the older one described in [5] is the considerably higher resolution (300 000 pixels as opposed to 80 000) and the larger number of frames (144 vs. 100) [3], [4].…”

Section: Ultrahigh-speed Video Cameramentioning

confidence: 99%

See 2 more Smart Citations

Flow instability induced by spiked bodies

et al. 2008

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In order to investigate the unsteady flow field around a spiked body in supersonic flow, time-resolved color schlieren visualization was applied using a high-speed video camera which could take up to 1 000 000 frames per second at full frame resolution. Conically and spherically tipped spikes of six different lengths could be attached at the center of the model and their effect on the flow unsteadiness was visually observed. The obtained images revealed in great detail the interaction between the incoming free stream flow and the high-pressure region near the model base, which could make its presence known upstream at the tip of the spike by means of displacing the boundary layer on the spike and subsequently inducing a large-scale instability of the flow.

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Section: Flat Disk With Spikementioning

confidence: 89%

Section: Ultrahigh-speed Video Cameramentioning

confidence: 93%

Section: Ultrahigh-speed Video Cameramentioning

confidence: 99%

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Flow instability induced by spiked bodies

et al. 2008

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“…Typically, shock velocity and particle velocity are the chosen observables, 12,13 although density is sometimes measured instead. Many robust techniques already exist to measure shock velocity either directly or indirectly, such as time-resolved Schlieren imaging, 14 velocity interferometry (VISAR), 15,16 and fiber-optic shock break out (FOSBO). 2 Particle velocity is often calculated from U s and the velocity of the projectile by shock-impedance matching.…”

Section: Introductionmentioning

confidence: 99%

Characterizing shock waves in hydrogel using high speed imaging and a fiber-optic probe hydrophone

Anderson

Betney

Doyle³

et al. 2017

Physics of Fluids

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The impact of a stainless steel disk-shaped projectile launched by a single-stage light gas gun is used to generate planar shock waves with amplitudes on the order of 102MPa in a hydrogel target material. These shock waves are characterized using ultra-high-speed imaging as well as a fiber-optic probe hydrophone. Although the hydrogel equation of state (EOS) is unknown, the combination of these measurements with conservation of mass and momentum allows us to calculate pressure. It is also shown that although the hydrogel behaves similarly to water, the use of a water EOS underpredicts pressure amplitudes in the hydrogel by ∼10% at the shock front. Further, the water EOS predicts pressures approximately 2% higher than those determined by conservation laws for a given value of the shock velocity. Shot to shot repeatability is controlled to within 10%, with the shock speed and pressure increasing as a function of the velocity of the projectile at impact. Thus the projectile velocity may be used as an adequate predictor of shock conditions in future work with a restricted suite of diagnostics.

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“…25 It should be noted that even with steady facility flow the phenomena of interest may be inherently unsteady. See for example Kleine et al (2005), who visualise the unsteady flow around a double cone geometry using high-speed colour schlieren. the entire model flow be established during the test time as this would be appropriate for force balance tests.…”

Section: Test Time Determinationmentioning

confidence: 99%

An experimental investigation of an airframe integrated three-dimensional scramjet engine at a Mach 10 flight condition

Doherty¹

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The University of Queensland in 2014 school of mechanical and mining engineering centre for hypersonics abstract Realisation of the dream of airbreathing access-to-space requires the development of a scramjet engine that produces sufficient net thrust to enable acceleration over a wide Mach number range. With engines that are highly integrated with the airframe, the net performance of a scramjet powered vehicle is closely coupled with the vehicle attitude and is difficult to determine only from component level studies. This work investigates the influence of airframe integration on the performance of an airframe integrated scramjet through the measurement of internal pressure distribution and the direct measurement of the net lift, thrust and pitching moment using a three-component stress wave force balance. The engine chosen as the basis for this study was the Mach 12 rectangularto-elliptical shape-transition (m12rest) scramjet that was developed by Suraweera and Smart (2009) as a research engine for access-to-space applications. The inlet and combustor flowpath were integrated with a slender 6°wedge forebody, streamlined external geometry and three dimensional thrust nozzle. The scale of the engine was chosen so that the entire engine would fit within the core-flow diamond (bi-conic) produced by a Mach 10 facility nozzle. The Mach 10b facility nozzle was chosen because it is the largest nozzle current in use with the t4 Stalker Tube and because the offdesign performance of a scramjet engine is of interest for access-to-space vehicles that must accelerate over a range of Mach numbers.Freejet experiments were conducted within the t4 Stalker Tube. Two trueflight Mach 10 test conditions were used: a high pressure test condition that replicated flight at a dynamic pressure of 48 kPa and a low pressure test condition that replicated flight at a dynamic pressure of 28 kPa. Scaling of the test conditions according to the established binary scaling law was not completed due to facility operational limits.The engine featured two fuel injection stations from which gaseous hydrogen was injected. The first injection station was partway along the length of the inlet while the second injection station was at the start of the combustor behind a rearward facing circumferential step. In addition to investigating inlet-only and step-only injection, a combined scheme where 68 % of the fuel was injected from the step station and 32 % from the inlet station was also investigated.To support the analysis of the experimental results, numerical simulations of the engine with no fuel injection were conducted using the nasa code vulcan. Analysis of the simulations show that the mass capture ratio with respect to the projected inlet area is approximately 60 % at each test condition. The simulations also show that spillage of flow from the slender forebody accounts for just 12 % of the flow through the projected iii inlet area, a small but non-negligible fraction. By integrating the engine surface forces, the drag coefficient with respect ...

show abstract

High-speed time-resolved color schlieren visualization of shock wave phenomena

Cited by 31 publications

References 12 publications

Flow instability induced by spiked bodies

Flow instability induced by spiked bodies

Characterizing shock waves in hydrogel using high speed imaging and a fiber-optic probe hydrophone

An experimental investigation of an airframe integrated three-dimensional scramjet engine at a Mach 10 flight condition

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