2018
DOI: 10.1051/epjconf/201818002058
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Rainbow schlieren measurements in underexpanded jets from square supersonic micro nozzles

Abstract: The slightly underexpanded free jet issued from a supersonic micro nozzle with a design Mach number of 1.5 and a square shape of 1 mm × 1 mm at the nozzle exit has been experimentally investigated using the rainbow schlieren deflectometry combined with the computed tomography where the nozzle operating pressure ratio is held constant at 4.0. Density fields in the free jet obtained from the rainbow schlieren deflectometry are the vortex sheet theory proposed by Tam. It is shown that there is good quantitative a… Show more

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Cited by 4 publications
(6 citation statements)
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“…Kolhe & Agrawal (2009) applied for the first time the rainbow schlieren deflectometry to a shock-containing jet issued from a micro cylindrical nozzle with an inner diameter of 500 µm at the nozzle exit. Maeda et al (2018) measured the density in a slightly underexpanded free jet issued from a micro nozzle with a design Mach number of 1.5 and a square shape of 1 mm × 1 mm at the nozzle exit plane. In their approach, a rainbow schlieren system combined with the computed tomography was utilized to reconstruct the jet three-dimensional density fields.…”
Section: Introductionmentioning
confidence: 99%
“…Kolhe & Agrawal (2009) applied for the first time the rainbow schlieren deflectometry to a shock-containing jet issued from a micro cylindrical nozzle with an inner diameter of 500 µm at the nozzle exit. Maeda et al (2018) measured the density in a slightly underexpanded free jet issued from a micro nozzle with a design Mach number of 1.5 and a square shape of 1 mm × 1 mm at the nozzle exit plane. In their approach, a rainbow schlieren system combined with the computed tomography was utilized to reconstruct the jet three-dimensional density fields.…”
Section: Introductionmentioning
confidence: 99%
“…In Figure 27, an example of color Schlieren applied to a supersonic nozzle, for an air-to-air jet, is shown. In [45], rainbow Schlieren deflectometry was used with computed tomography to measure the three-dimensional density fields of free jets containing shock from micro nozzles. The layout of the laboratory set-up is shown in Figure 28, wherein the <xz> plane In [45], rainbow Schlieren deflectometry was used with computed tomography to measure the three-dimensional density fields of free jets containing shock from micro nozzles.…”
Section: Schlieren Techniquementioning
confidence: 99%
“…In [45], rainbow Schlieren deflectometry was used with computed tomography to measure the three-dimensional density fields of free jets containing shock from micro nozzles. The layout of the laboratory set-up is shown in Figure 28, wherein the <xz> plane In [45], rainbow Schlieren deflectometry was used with computed tomography to measure the three-dimensional density fields of free jets containing shock from micro nozzles. The layout of the laboratory set-up is shown in Figure 28, wherein the <xz> plane feeding system of the nozzle is well explained: an electrovalve regulates the flow going inside a plenum chamber, where the dynamical pressure effect is dumped.…”
Section: Schlieren Techniquementioning
confidence: 99%
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“…The center of the nozzle exit is selected as the origin of the xyz-coordinate system; the nozzle exits are then located downward in the negative z-axis. The x-axis is located (a) Circular nozzle [24]; (b) Square nozzle [25]. between camera No.…”
Section: Micro Nozzles and Coordinate Systemmentioning
confidence: 99%