A Novel, High-Frequency, Reciprocal Calibration Method for Dynamic Pressure Sensors Used in High-Speed Flows

2010 ◽

Author(s):

Chen Xia ◽

Guoping Huang ◽

Jie Chen

Keyword(s):

Mass Flow ◽

High Speed ◽

Modular Design ◽

Thermal Protection ◽

Dynamic Pressure ◽

Pressure Sensors ◽

Test Facility ◽

Inlet Temperature ◽

Test Bed ◽

Turbo Machinery

The design and construction of a new test facility of micro turbo-machinery are presented for micro centrifugal compressors and radial turbines. The bed can be used for the full speed compressor test and the long duration hot turbine test. In order to adjust the testing condition rapidly, all the regulations of operating state are completed automatically by the control system. The test bed can be used for testing impeller performance with a series of diameter from 55 to 180 mm as a result of the modular design. A thermal protection system is designed to avoid the heat distortion caused by the high inlet temperature of turbine which may exceeds 1100K and provide a proper experimental environment for the electronic components. A photoelectric torque transducer with an accuracy of 1% is designed to measure the torque of a rigid shaft at a high speed over 120000rpm, and the maximum shaft torque is 7.7 N·m. The pressure and temperature are measured by pressure probes and thermocouples. The dynamic pressure signal of the centrifugal compressor is monitored by dynamic pressure sensors. The V-cone pressure-difference mass-flow meters are used for measuring mass-flow. The maximum rotating speed is 125000rpm, and the mass flow adjusted by the electric control valves varies from 0.1 to 1.0 kg/sec. The maximum inlet total temperature of the turbine is 1180K.

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Development of a Primary Dynamic Calibration Method for Pressure Sensors

19th International Congress of Metrology (CIM2019) ◽

10.1051/metrology/201927006 ◽

2019 ◽

Author(s):

Thomas Platte

Keyword(s):

Dynamic Pressure ◽

Pressure Sensors ◽

Calibration Method ◽

Dynamic Calibration ◽

Research Activity ◽

Pressure Transducers ◽

Aerospace Applications ◽

Thermodynamic Conditions ◽

Calibration Techniques ◽

Dynamic Calibration Method

An increasing research activity in the field of dynamic calibration of pressure transducers can be recognized at some national metrology institutes. As an example the EMPIR project “development of measurement and calibration techniques for dynamic pressures and temperatures” can be named. Despite that efforts, no national reference standard for dynamic pressure calibration is available up to now. This makes the measurement of high fluctuating pressure signals difficult and unprecise. These dynamic pressure signals appears in aerospace applications, blast test and almost every fluidic circuit which employs discontinuous discharge elements. To address that topic the authors developed a sine calibration apparatus to measure the frequency response of pressure transducers with sufficient amplitudes up to 1.2 MPa. Due to the construction of the pressure generator frequencies up to 10 kHz can be reached. Furthermore a calibration technique was developed to calculate the pressure inside a chamber primarily. The fundamental idea is to calculate the pressure based on the displacement of a piston in a pistonphone device. To do so the author had to analyses the thermodynamic conditions inside the fluid filled chamber. The paper shows that the fundamental approach was confirmed by measurements.

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Study on Calibration Method for Explosion Pressure Test System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.1928 ◽

2014 ◽

Vol 602-605 ◽

pp. 1928-1932

Author(s):

Geng Ran Liu ◽

Xing Gao Zhang ◽

Xin Zhao

Keyword(s):

High Frequency ◽

Pressure Sensors ◽

Calibration Method ◽

Test System ◽

Correct Selection ◽

High Frequency Signal ◽

Absolute Value ◽

Explosion Pressure ◽

Relative Errors ◽

Selection Of

The segment sensitivity for various pressure sensors is obtained by implementing the static and dynamic calibrations for three types of pressure sensors, i.e., CY-YD-202, CY-YD-205 and CY-YD-203T, and the average absolute value of relative errors for sensors is obtained by measuring the dynamic high-frequency signal, which provides the basis for correct selection of pressure sensor during the test.

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Numerical Simulation Method for Velocity Sensors Calibration in High Speed Flows

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.811.194 ◽

2015 ◽

Vol 811 ◽

pp. 194-198

Author(s):

Laura Alina Stika ◽

Mircea Boscoianu ◽

Valeriu Alexandru Vilag ◽

Ionuţ Porumbel

Keyword(s):

High Speed ◽

Simulation Method ◽

Calibration Method ◽

Measurement Range ◽

Pitot Tube ◽

Velocity Measurements ◽

Initial Value ◽

Calibration Methods ◽

Rms Error ◽

High Speed Flows

The paper presents RANS numerical simulations carried out to calibrate the Pitot tube velocity measurements in order to extend the accurate measurement range to high velocities, up to 250 m/s. Three calibration methods are proposed, able to reduce the rms error of the velocity measurement from an initial value of 6.5 m/s, to 3.11 m/s, 2.33 m/s, and 0.08 m/s, respectively. As the accuracy of the calibration method increases, the complexity and the portability of the method for other flows and other Pitot tube dimensions is found to decrease.

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Supermagnetosonic subsolar magnetosheath jets and their effects: from the solar wind to the ionospheric convection

Annales Geophysicae ◽

10.5194/angeo-30-33-2012 ◽

2012 ◽

Vol 30 (1) ◽

pp. 33-48 ◽

Cited By ~ 61

Author(s):

H. Hietala ◽

N. Partamies ◽

T. V. Laitinen ◽

L. B. N. Clausen ◽

G. Facskó ◽

...

Keyword(s):

Magnetic Field ◽

Solar Wind ◽

Interplanetary Magnetic Field ◽

High Speed ◽

Dynamic Pressure ◽

Bow Shock ◽

Ionospheric Convection ◽

Scale Size ◽

High Dynamic ◽

High Speed Flows

Abstract. It has recently been proposed that ripples inherent to the bow shock during radial interplanetary magnetic field (IMF) may produce local high speed flows in the magnetosheath. These jets can have a dynamic pressure much larger than the dynamic pressure of the solar wind. On 17 March 2007, several jets of this type were observed by the Cluster spacecraft. We study in detail these jets and their effects on the magnetopause, the magnetosphere, and the ionospheric convection. We find that (1) the jets could have a scale size of up to a few RE but less than ~6 RE transverse to the XGSE axis; (2) the jets caused significant local magnetopause perturbations due to their high dynamic pressure; (3) during the period when the jets were observed, irregular pulsations at the geostationary orbit and localised flow enhancements in the ionosphere were detected. We suggest that these inner magnetospheric phenomena were caused by the magnetosheath jets.

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