A Modified Point-Diffraction Interferometry for Shock Tube Airfoil Testing

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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“…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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“…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

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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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