Preliminary Study on Diaphragmless Shock Tube for Transonic Airfoil Testing with PDI

Kashitani, Masashi; Yamaguchi, Yutaka; Oki, Genkai; Kitano, Hideki; Esashi, Satoru

doi:10.2514/6.2010-744

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…This design allows the driver section and driven section to be in-line with each other. The design developed by Kashitani et al 1 produced shock waves between 1.2 ≤ M S ≤ 2.1 with air and within 11% -30% of ideal shock tube theory. Kashitani's design also had a repeatability of < 1%, and shock wave formation distances of 20 -100 tube diameters downstream of the piston valve.…”

Section: Introductionmentioning

confidence: 99%

“…Rêgo et al 13 held a piston in place by an auxiliary pressure chamber, instead of a vacuum cavity and brake, located behind the piston . The driver gas accelerated the piston once the 1 Graduate Student, Aerospace Engineering. 2 Professor, Aerospace Engineering, Associate Fellow AIAA.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] Ludweig tube facilities have been around since the 1950s. 9-10 Furthermore, impulse facilities (such as shock and Ludweig tubes) are also used as wind tunnels.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Characterization and Feasibility of a Low-Duty-Cycle Fast Valve for Impulse Facilities

Taylor

Mendoza

Bowersox

2012

42nd AIAA Fluid Dynamics Conference and Exhibit

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This paper describes the feasibility and characterization of a novel fast valve concept, which can replace the diaphragms in shock and Ludweig tube facilities. The proposed fast valve system consists of a rotating door and locking camshaft system. The concept was tested in a bench-top scale shock tube facility, which was operated over a driver gas (air) pressure range of 60 to 500 psig, with a duty cycle of 6 seconds. The measured wave speeds (M S = 1.7 -2.0) were within 3.1% of that predicted by ideal shock tube theory and a statistical repeatability within 7.9%. However, the post-shock driven gas pressures were approximately half that expected from ideal shock tube theory, which was attributed to losses associated with the mechanism (66% area increase) and incomplete shock wave formation. Nonetheless, these results show promise that the rotating door opening time may be sufficient for repeatable Ludweig tubes and shock wave generation given higher driver gas pressures and a longer test section.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Characterization and Feasibility of a Low-Duty-Cycle Fast Valve for Impulse Facilities

Taylor

Mendoza

Bowersox

2012

42nd AIAA Fluid Dynamics Conference and Exhibit

View full text Add to dashboard Cite

show abstract

“…years. For example, a focusing schlieren system was developed to visualize slice images of transonic airfoil flows [3][4] [5].…”

Section: Introductionmentioning

confidence: 99%

Fundamental Study on Operational Conditions of Diaphragmless Shock Tube Driven by Pneumatic Piston

Taguchi¹,

Kashitani²,

Nishiyama³

2018

IJMERR

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We analyze the influences of initial conditions on a diaphragmless shock tube operation. The system consists of a driver tube, driven tube, and damp tank. The driver tube has a circular cross section with a diameter of 150 mm, while the driven tube has a rectangular cross section (60 mm × 150 mm). The shock tube is operated using a quickopening pneumatic piston. Two types of piston driver are employed to release the pressure inside the piston: small diaphragm and solenoid valve types. The effect of the piston driver type on the shock Mach number is evaluated. Moreover, the initial piston pressure is chosen as a parameter to investigate its effects on the shock Mach number. The shock Mach number is determined by not only the initial operational pressure ratio of the shock tube but also the initial pressure in the high-pressure section in the diaphragmless shock tube. For a range of initial piston pressures, the shock Mach number is almost constant under a constant initial operational pressure ratio.

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“…This shock tube system has been used to investigate aerodynamic characteristics of the transonic airfoil flows, and to develop the progress flow visualization technique for the past few years. For example, developing the focusing schlieren system to visualize slice image of transonic airfoil flows etc [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Fundamental Study on Operational Parameters of Diaphragmless Shock Tube

2018

Self Cite

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This paper shows influences of initial conditions on a diaphragmless shock tube operation. This facility consists of a driver tube, a driven tube and a damp tank. The driver tube has a circular cross section with diameter of 150 mm and the driven tube, a rectangular cross section (60 mm x 150 mm). The shock tube is operated by using a quick-opening pneumatic piston instead of a diaphragm. For the operation, pressure inside the pneumatic piston (piston pressure) is quickly released by opening a solenoid valve. In this paper, the initial piston pressure was chosen as a parameter to investigate effects on test flow conditions created by the shock tube. As a result, it was found that when the piston pressure at initial condition is large, piston pressure decreased more rapidly than that obtained for a small piston pressure condition, regardless of the pressure ratio of driver and the driven tube. In the condition of a constant initial operational pressure ratio and a different piston pressure, the shock Mach number was almost constant.

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Preliminary Study on Diaphragmless Shock Tube for Transonic Airfoil Testing with PDI

Cited by 7 publications

References 5 publications

The Characterization and Feasibility of a Low-Duty-Cycle Fast Valve for Impulse Facilities

The Characterization and Feasibility of a Low-Duty-Cycle Fast Valve for Impulse Facilities

Fundamental Study on Operational Conditions of Diaphragmless Shock Tube Driven by Pneumatic Piston

Fundamental Study on Operational Parameters of Diaphragmless Shock Tube

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