Study of an underexpanded sonic jet. 1st report On the mechanism of pseudo-shock waves and pressure and velocity in jets.

忠倫, 児島; 祥浩, 松岡

doi:10.1299/kikaib.52.2021

Cited by 3 publications

(3 citation statements)

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“…The cross-sectional velocity profile of a supersonic under-expanded jet differs depending on the expansion or compression regions. Kojima, T. et al [4] showed that the velocity profile in the shock cell of a supersonic under-expanded free jet was concave initially, convex in the middle, and nipple-shaped at the end. The velocity profile at θ = 3.25˚ was concave and asymmetric, with a minimum at the jet center, which differs from Kojima's classification of convex.…”

Section: Centerline Velocity Of Supersonic Reattached Jetmentioning

confidence: 99%

“…Donaldson et al [3] classified the flow patterns of sub-and supersonic under-expanded jets into three, depending on the pressure ratio of the supply pressure to the ambient pressure. Kojima et al [4], Zapryagaev et al [5], and André et al [6] studied the structure of shock waves, the pressure and velocity distribution of supersonic under-expanded jets. Shadow et al [7] and Zaman [8] showed the compressible spreading rates and mixing characteristics of supersonic coaxial jets.…”

Section: Introductionmentioning

confidence: 99%

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Flow Characteristics of Two-Dimensional Supersonic Under-Expanded Coanda-Reattached Jet

Ohmura¹,

Shakouchi²,

Fukushima³

et al. 2021

JFCMV

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Section: Centerline Velocity Of Supersonic Reattached Jetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow Characteristics of Two-Dimensional Supersonic Under-Expanded Coanda-Reattached Jet

Ohmura¹,

Shakouchi²,

Fukushima³

et al. 2021

JFCMV

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“…2(1)(d) and 2(d'). The velocity distribution is different primarily owing to the small supplied pressure of P 0 = 0.02 [MPa], and the Pi-jet exhibits a distinguished minimum velocity at the jet center because it is in the expansion region of the shock cell (Kojima et al, 1986) and recovers to the downstream. The minimum velocity of the Ori-jet is not so small; however, it disappears at the downstream of x/d 0 = 5.4 it disappears.…”

mentioning

confidence: 99%

Flow characteristics of sub- and supersonic jets issued from orifice and notched orifice nozzles, and application to ejector

Shakouchi

Tanoue

Tsujimoto

et al. 2019

JFST

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The flow characteristics of sub-and supersonic under-expanded jets issued from circular nozzles have been studied well; however, this does not apply to sub-and supersonic jets from an orifice nozzle. In this study, the flow characteristics of sub-and supersonic jets issued from an orifice or notched special orifice nozzle are examined experimentally based on the results of a visualized flow pattern by the Schlieren method and the measurements of velocity distribution by a thin supersonic Pitot tube. That is, the effects of the nozzle shape on the flow characteristics such as the decay of the jet centerline velocity, velocity distribution at the cross section, increment of the jet-width and-flow rate to the downstream are examined experimentally. Results indicate that the jet issued from the notched orifice nozzle with a rectangular notch demonstrates excellent entrainment performance. In addition, to improve the performance of a cylindrical ejector, the application of the results is examined.

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Passive flow control of jets

Shakouchi

2020

Mechanical Engineering Reviews

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One of the major purposes of fluid mechanics and engineering is to reduce the flow resistance caused by flow friction, flow separation, vortex generation, and other factors. To reduce or eliminate flow resistance, in general, flow control is performed either passively or actively. Passive flow control is performed by changing the flow channel or object shape a little and reducing the total flow resistance. On the contrary, active flow control uses a device requiring power, but it can perform various complex flow controls. In this paper, the passive flow control of jets is examined with flow characteristics, control methods, and some applications because jet flows include the essence of fluid dynamics, such as, boundary layer flow, turbulent flow, shear flow, and flow mixing. In particular, the effects of the nozzle shape, the tab, rib and vortex generator, and the orifice or notched orifice on the flow characteristics of sub-and supersonic jets are examined. Furthermore, the control and suppression of high speed jet noise by a chevron nozzle, some examples of active flow control, and other areas are examined. Globular formation of fine solid particles by flow control, lift control of airplane wings, and the flow control of a NOTAR helicopter without tail rotor are also addressed.

show abstract

Study of an underexpanded sonic jet. 1st report On the mechanism of pseudo-shock waves and pressure and velocity in jets.

Cited by 3 publications

References 0 publications

Flow Characteristics of Two-Dimensional Supersonic Under-Expanded Coanda-Reattached Jet

Flow Characteristics of Two-Dimensional Supersonic Under-Expanded Coanda-Reattached Jet

Flow characteristics of sub- and supersonic jets issued from orifice and notched orifice nozzles, and application to ejector

Passive flow control of jets

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