scholarly journals Measurement of Strong Shock Pressure

1997 ◽  
Vol 4 (5-6) ◽  
pp. 403-409
Author(s):  
Hajime Takada ◽  
Daisuke Fujimaki ◽  
Takao Tsuboi
Keyword(s):  
Shock Tube ◽  
Pressure Transducer ◽  
Shock Absorber ◽  
Transfer Functions ◽  
Strong Shock ◽  
Shock Pressure ◽  
Pressure Transducers ◽  
Pressure Peak

This paper deals with measurement of a strong shock pressure like an imploding detonation of over 1 GPa which cannot be measured directly with currently available commercial pressure transducers. After the transfer functions of three kinds of materials were measured using a shock tube, Teflon was selected as a shock absorber. As an example of pressure beyond the limit of the pressure transducer, we tried to measure pressure at the center of an imploding detonation. From this measurement, we could estimate the pressure peak of about 1.7 GPa.

Dynamic characterisation of pressure transducers using shock tube methods

2019 ◽  
Vol 42 (4) ◽  
pp. 743-748
Author(s):  
Andy J Knott ◽  
Ian A Robinson
Keyword(s):  
Dynamic Response ◽  
Shock Tube ◽  
Significant Variation ◽  
Pressure Transducer ◽  
Ideal Gas ◽  
Pressure Transducers ◽  
Pressure Step ◽  
Instantaneous Pressure

This paper describes the characterisation of the dynamic response of a range of pressure transducer systems. The transducers were subjected to virtually instantaneous pressure step inputs in the National Physical Laboratory’s shock tube facilities. The magnitudes of these pressure steps were derived from ideal gas theory, with prior commissioning tests having been performed to demonstrate the theory’s validity in this application. The results demonstrate a significant variation in response obtained from various combinations of transducer, instrumentation settings, and mounting arrangement.

scholarly journals Application of shock tube in calibrating dynamic pressure transducers

2018 ◽  
Vol 1064 ◽  
pp. 012055 ◽  
Author(s):  
Laijun Yan ◽  
Yong Chen ◽  
Lihu Zhang ◽  
Xu Zhang ◽  
Xianghong Yao ◽  
...  
Keyword(s):  
Shock Tube ◽  
Dynamic Pressure ◽  
Pressure Transducers

scholarly journals Does temperature affect the accuracy of vented pressure transducer in fine-scale water level measurement?

2015 ◽  
Vol 4 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Z. Liu ◽  
C. W. Higgins
Keyword(s):  
Water Level ◽  
Pressure Transducer ◽  
Performance Test ◽  
Thermal Fluctuations ◽  
Field Conditions ◽  
Digital Data ◽  
Water Level Fluctuations ◽  
Fine Scale ◽  
Data Logger ◽  
Pressure Transducers

Abstract. Submersible pressure transducers have been utilized for collecting water level data since the early 1960s. Together with a digital data logger, it is a convenient way to record water level fluctuations for long-term monitoring. Despite the wide use of pressure transducers for water level monitoring, little has been reported regarding their accuracy and performance under field conditions. The effects of temperature fluctuations on the output of vented pressure transducers were considered in this study. The pressure transducers were tested under both laboratory and field conditions. The results of this study indicate that temperature fluctuation has a strong effect on the transducer output. Rapid changes in temperature introduce noise and fluctuations in the water level readings under a constant hydraulic head while the absolute temperature is also related to sensor errors. The former is attributed to venting and the latter is attributed to temperature compensation effects in the strain gauges. Individual pressure transducers responded differently to the thermal fluctuations in the same testing environment. In the field of surface hydrology, especially when monitoring fine-scale water level fluctuations, ignoring or failing to compensate for the temperature effect can introduce considerable error into pressure transducer readings. It is recommended that a performance test for the pressure transducer is conducted before field deployment.

On the Use of Fast-Response Pressure Transducers in a Common-Rail Diesel Injection System

2006 ◽  
Author(s):  
R. Amirante ◽  
L. A. Catalano ◽  
A. Dadone ◽  
V. Lombardo
Keyword(s):  
Pressure Transducer ◽  
Single Injection ◽  
Electric Circuit ◽  
Fast Response ◽  
Common Rail ◽  
Injection System ◽  
Pressure Transducers ◽  
Multiple Injections ◽  
Diesel Injection ◽  
Response Pressure

The aim of this paper is to investigate the use of fast-response pressure transducers for measuring the instantaneous pressure in different sections of a common-rail diesel injection system, both for a single injection and for multiple injections. The influence of the pressure transducer onto the measured pressure is evaluated numerically by comparing the pressure history computed without the pressure transducer and that computed with the presence, and thus with the disturbance, of this sensor. A new electric circuit is proposed in substitution of the standard electronic central unit, which allows to modify the injection parameters and to perform injections on a test rig, as done in the automotive applications. Experimental results are provided both for a single injection and for multiple injections, to demonstrate the capabilities of the proposed test bench for the unijet injectors.

scholarly journals A Shock Tube Study on Nonequilibrium Radiation of Strong Shock Waves in Low-Density Air.

1998 ◽  
Vol 41 (2) ◽  
pp. 390-396 ◽  
Author(s):  
Hiroki HONMA ◽  
Toshihiro MORIOKA ◽  
Nariaki SAKURAI ◽  
Kazuo MAENO
Keyword(s):  
Shock Waves ◽  
Shock Tube ◽  
Strong Shock ◽  
Low Density ◽  
Nonequilibrium Radiation ◽  
Strong Shock Waves ◽  
Tube Study

Experimental Investigation of Nano Ceramic Material Interaction with High Enthalpy Argon under Shock Dynamic Loading

2011 ◽  
Vol 83 ◽  
pp. 66-72 ◽  
Author(s):  
Vishakantaiah Jayaram ◽  
Singh Preetam ◽  
K. P. J. Reddy
Keyword(s):  
Shock Tube ◽  
Dynamic Loading ◽  
Strong Shock ◽  
Ceramic Materials ◽  
Reflected Shock Wave ◽  
Free Piston ◽  
High Pressure And Temperature ◽  
High Enthalpy ◽  
Reflected Shock ◽  
Ar Gas

Indigenously designed and fabricated free piston driven shock tube (FPST) was used to generate strong shock heated test gases for the study of aero-thermodynamic reactions on ceramic materials. The reflected shock wave at the end of the shock tube generates high pressure and temperature test gas (Argon, Ar) for short duration. Interaction of materials with shock heated Ar gas leads to formation of a new solid or stabilization of a material in new crystallographic phase. In this shock tube, the generated shock waves was utilized to heat Ar to a very high temperature (11760 K) at about 40-55 bar for 2-4 ms. We confirmed the phase transformation and electronic structure of the material after exposure to shock by XRD and XPS studies. This high enthalpy gas generated in the shock-tube was utilized to synthesize cubic perovskite CeCrO3from fluorite Ce0.5Cr0.5O2+δoxide. We were able to demonstrate that this ceramic materials undergoes phase transformations with the interaction of high enthalpy gas under shock dynamic loading.

Experimental Investigation of Spiral Tubes Steam Generator Rupture Scenarios in LIFUS5/Mod2 Facility for ELFR

2016 ◽  
Author(s):  
Alessio Pesetti ◽  
Alessandro Del Nevo ◽  
Nicola Forgione
Keyword(s):  
Steam Generator ◽  
Tube Bundle ◽  
Injection Pressure ◽  
Strain Gages ◽  
Cylindrical Wall ◽  
Pressure Transducers ◽  
Evolution Path ◽  
High Injection Pressure ◽  
Pressure Peak ◽  
Lower Temperature

In the framework of the EC FP7 LEADER project, an experimental campaign was performed in the LIFUS5/Mod2 facility, at ENEA CR Brasimone, for investigating the postulated Steam Generator Tube Rupture (SGTR) event in a relevant configuration for the spiral tube Steam Generator (SG) of the European Lead Fast Reactor (ELFR). Two tests are analysed. The LIFUS5/Mod2 facility implemented a test section composed by 188 tubes, vertically disposed with triangular pitch, in a shell closed by top and bottom flanges and having a perforated cylindrical wall. The central tube injected water at about 180 bar and 270°C, at middle height of the tube bundle, in the reaction tank partially filled by Lead-Bismuth Eutectic alloy (LBE) at 400°C with an argon cover gas at about 2 bar. It was connected to a 2 m3 dump tank, due to the high injection pressure. In the reaction tank fast instrumentation was set: 6 fast Pressure Transducers (PTs) acquiring data at 10 kHz for precisely characterize the first injection peaks; 70 low constant time Thermocouples (TCs) to understand the vapour evolution path; and 13 strain gages (SGGs) to measure the strain of the bundle and main vessel. The first test analysed showed a first pressure peak of about 25 bar, due to pressure wave propagation at the cap rupture instant. It did not appear in the second test as consequence of a leakage from the cap before the complete rupture. The following pressurization caused by the entering of water into the reaction vessel was of an analogues magnitude for both the tests (about 30 bar). The water/LBE interaction lower temperature was reached on the inner ranks of tubes, about 160°C. The outer rank was cooled down to 340°C. The strain gage measurements showed a decreasing deformation on the tubes toward the outer positions. No ruptures were observed on tubes surrounding the injector. The amount of LBE transported into the dump tank was strongly dependent on the LBE level in the reaction tank at the start of the tests.

scholarly journals Shock tube-based calibration installation for dynamic pressure transducers and performance testing

2019 ◽  
Vol 2019 (23) ◽  
pp. 8577-8582
Author(s):  
Laijun Yan ◽  
Xu Zhang ◽  
Lihu Zhang ◽  
Xianghong Yao ◽  
Xinhua Qi ◽  
...  
Keyword(s):  
Shock Tube ◽  
Dynamic Pressure ◽  
Performance Testing ◽  
Pressure Transducers ◽  
And Performance

Measurement of Two-Dimensional Periodic Flow With a Cobra Probe

1973 ◽  
Vol 95 (2) ◽  
pp. 295-299 ◽  
Author(s):  
Y. Senoo ◽  
Y. Kita ◽  
K. Ookuma
Keyword(s):  
Pressure Transducer ◽  
Static Pressure ◽  
Flow Characteristics ◽  
Periodic Flow ◽  
Two Dimensional ◽  
Unsteady State ◽  
Pump Impeller ◽  
Pressure Transducers ◽  
Probe System ◽  
Similarity Law

Three semiconductor pressure transducers were inserted into a cobra probe to measure instantaneous condition of flow at the exit of a pump impeller. As it was difficult to calibrate a probe in a two-dimensional periodic flow which was similar to the periodic flow to be measured, the authors used the probe assuming that the steady flow characteristics were valid and examined the results in several ways. The results at different pump speeds satisfied the similarity law of flow from the impeller, and it was concluded that the time response of the probe and pressure transducer system was satisfactory. Almost identical results were obtained regardless of the orientation of the probe, and it was concluded that the calibration curve at steady state was applicable to the unsteady state. Finally, the static pressure calculated from the probe output agreed with the wall pressure which was directly measured with a semiconductor pressure transducer. The authors believe that the three steps are sufficient to prove that the results obtained with the probe are reliable and the probe system is suitable for measurement of periodic flow at the exit of impeller of a pump.

A technique for measuring frequency response of pressure, volume, and flow transducers

1979 ◽  
Vol 47 (2) ◽  
pp. 462-467 ◽  
Author(s):  
A. C. Jackson ◽  
A. Vinegar
Keyword(s):  
Frequency Response ◽  
Pressure Transducer ◽  
Test System ◽  
Good Frequency ◽  
Pressure Transducers ◽  
Response Characteristics ◽  
Measuring Frequency

A device and methodology is presented for testing the frequency response of pressure, volume, or flow transducers. Also reported are responses of selected transducers of all three types over the range of 2--120 Hz. Several pressure transducers tested had good frequency response when connected to the test system with a minimum of interconnecting fittings; others did not. Use of additional connectors degraded the response as did the addition of air-filled catheters. The frequency response of the pneumotachometers tested were influenced largely by the response characteristics of the associated pressure transducer and interconnecting fittings. These results emphasize the need to test the response characteristics of any transducer with specific connectors and fittings that are to be used to make the actual measurements of pressure, volume, or flow.

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