Dynamic characterisation of pressure transducers using shock tube methods

Knott, Andy; Robinson, Ian

doi:10.1088/1742-6596/1065/16/162002

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…In order to minimize the boundary layer effect on the strength of the generated shock waves, the inner surfaces of the walls of the tube were machined to a mean roughness of less than 0.2 µm. The shock tube is rigidly attached with five massive mounting blocks along its length in order to eliminate the vibrations of the tube generated by the opening of the valve and the motion of the shock waves, which could affect the more acceleration-sensitive pressure meters during calibration [12,22,23]. The complete tube sections were tested at a static pressure of 10 MPa for 30 min to ensure that reliable sealing is maintained under the operating conditions of the shock tube.…”

Section: Developed Diaphragmless Shock Tubementioning

confidence: 99%

“…The reflection of the shock front off the endwall of the driven section, where the pressure meter to be calibrated is mounted, causes a rapidly rising step change in the pressure at this point. By assuming a calorically perfect gas and an adiabatic flow, the amplitude of the pressure step upon reflection of the initial shock front can be calculated using traceable measurements of the shock wave velocity W, and the initial, stationary absolute pressure p 1, and temperature T 1 of the gas in the driven section, as [6,[8][9][10][11][12]:…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a newly developed diaphragmless shock tube for the primary dynamic calibration of pressure meters

Svete

Kutin

2020

Metrologia

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In conventional shock tubes with a diaphragm, many effects related to the burst of the diaphragm can influence shock formation, thus preventing an ideal pressure step change, as predicted by the shock tube measurement model being generated. This paper presents a newly developed diaphragmless shock tube with a quick-acting pneumatic valve, which demonstrates several advantages over conventional shock tubes with a diaphragm. The tests of the developed diaphragmless shock tube were performed using nitrogen at the atmospheric initial driven pressure, and at initial driver gauge pressures from 1 MPa to 7 MPa. The results show that the construction of the developed shock tube effectively reduces the generation of secondary shock waves and mechanical vibrations, which are often generated during the operation of shock tubes, thereby increasing the uncertainty of the shock tube calibration method. The uncertainty analysis shows that the developed diphragmless shock tube can act as a primary time-varying pressure calibration standard, generating pressure steps with a magnitude calculable from its measurement model to characterize the dynamic performance of pressure transducers with a relative expanded uncertainty of less than 0.025.

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Section: Developed Diaphragmless Shock Tubementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of a newly developed diaphragmless shock tube for the primary dynamic calibration of pressure meters

Svete

Kutin

2020

Metrologia

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“…This development has been continuing in the ongoing 17IND07 DynPT-project [5] of the The European Metrology Programme for Innovation and Research (EMPIR). National Physical Laboratory (NPL) and Research Institute of Sweden (RISE) are developing shock tubes [6,7]. Laboratoire national de métrologie et d'essais/Ecole Nationale Supérieure d'Arts et Métiers (LNE/ENSAM) are developing dynamic pressure standards based on shock tube and fast-opening valve principles [1].…”

Section: Introductionmentioning

confidence: 99%

Advances in traceable calibration of cylinder pressure transducers

Salminen¹,

Saxholm²,

Hämäläinen³

et al. 2020

Metrologia

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Accurate and reliable dynamic pressure measurements are needed for optimizing performance in modern combustion engines, manufacturing processes and aerospace applications. Besides fast pressure transients, these applications subject dynamic pressure transducers to elevated temperatures. Both of these quantities effect the sensitivity of transducers. Therefore, transducers should be calibrated at conditions that corresponds to the operating environment. To answer these needs, the National Metrology Institute VTT MIKES has developed its drop weight dynamic pressure primary standard further. Developments include improved control and measurement of the falling weight, extension of the pressure range to combustion engine pressures down to 3 MPa and a heating option for dynamic pressure transducers under calibration. These advances enable traceable calibration of cylinder pressure transducers at conditions relevant to engine applications. The overall uncertainty (k = 2) of calibration is estimated to be around 1.7%. The performance was demonstrated by calibrating a piezoelectric pressure transducer in the pressure and temperature range from 7 MPa to 30 MPa in 20 °C, 120 °C and 180 °C, respectively. As a result, traceable calibrations of dynamic pressure transducers can be performed at conditions relevant for engine applications. This improves the reliability and accuracy of in-cylinder pressure measurements.

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“…The deviation of this output from a perfect step response can be thought of as a measure of the system's non-ideal dynamic characteristics. This paper reports (in more detail than Knott and Robinson, 2018) on the validation of the National Physical Laboratory (NPL)'s shock tube facilities and on how different pressure measurement systems responded to pressure steps generated within them.…”

Section: Introductionmentioning

confidence: 99%