Drag and rolling moment measurements using accelerometer-based force balance in a shock tunnel

Jang, B.; Kim, K.; Park, G.

doi:10.1007/s00193-023-01143-4

Shock Waves

2023

DOI: 10.1007/s00193-023-01143-4

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Drag and rolling moment measurements using accelerometer-based force balance in a shock tunnel

B. Jang,

K. Kim,

G. Park

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2024

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Cited by 2 publications

References 36 publications

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Nozzle Flow Characterization of the SNU Hypersonic Shock Tunnel

Kim,

Hur

et al. 2024

Int. J. Aeronaut. Space Sci.

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This paper presents the operational capabilities and the characteristics of the nozzle flow of the Seoul National University Hypersonic Shock Tunnel (SHyST), a recently added impulse facility designed to produce high-enthalpy flows reaching up to 5 MJ/kg through hypersonic contoured nozzles. Within this investigation, emphasis is placed on the design and utilization of a pitot rake, serving as an essential instrument for quantifying pitot pressure and Mach number distributions throughout the test section. The experimental results confirm the presence of axis-symmetric behavior and spatial–temporal uniformity of the freestream Mach number at the nozzle outlet and along the test section. In addition, the study demonstrates a good agreement with the predictions of numerical simulation. Mach number validation is further supported by the measurement of shock standoff distance through schlieren visualization.

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Nozzle Flow Characterization of the SNU Hypersonic Shock Tunnel

Kim,

Hur

et al. 2024

Int. J. Aeronaut. Space Sci.

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Influence of Diaphragms on Pressure and Heat Flux Measurements in a Shock Tunnel

Jang,

Kim,

Park

2024

Int. J. Aeronaut. Space Sci.

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An experimental study investigated the flow disturbances caused by diaphragm debris in a shock tunnel, specifically between a driven tube and a nozzle. The impact of debris-induced disturbances on pressure and heat flux measurements was examined with two types of diaphragms: a single-layer ultra-thin polyethylene film and a double-layer diaphragm, where eight direction pre-cut polyethylene film was sealed with copper tape. The study involved measuring the pitot pressure and stagnation-point heat flux, using a flat-faced model and a hemisphere model, respectively. The pitot pressure was measured using a piezoelectric-based pressure transducer, while heat flux was recorded with a fast-response surface-junction coaxial thermocouple calibrated through the water-plunging method. The experimental data for both diaphragms correlated well with theoretical predictions. The shadowgraph flow visualization technique was employed to visualize diaphragm debris. The flow quality in the shock tunnel was assessed by analyzing normalized disturbances, representing fluctuations in pitot pressure, and heat flux measurements. The experimental results indicated that the double-layer diaphragm effectively reduced diaphragm debris and improved flow quality in shock tunnel experiments.

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Drag and rolling moment measurements using accelerometer-based force balance in a shock tunnel

Cited by 2 publications

References 36 publications

Nozzle Flow Characterization of the SNU Hypersonic Shock Tunnel

Nozzle Flow Characterization of the SNU Hypersonic Shock Tunnel

Influence of Diaphragms on Pressure and Heat Flux Measurements in a Shock Tunnel

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