Effects of the opening speed of the valve in a diaphragmless shock tube for metrological purposes

Hernández Castro, Francisco Javier (author), Kutin, Jože (author), Svete, Andrej (author)

To develop a measurement system for calibrating high-frequency dynamic pressure that is capable of acting as a primary dynamic pressure calibration standard, a new concept of the shock tube, called the diaphragmless shock tube, has recently been developed. In most such shock tubes, the diaphragm is replaced with a commercially available, ISTA KB fast-opening valve (FOV). In this article, a numerical model was built in OpenFOAM to investigate the effects of the opening mechanism of ISTA KB-40-100 FOV on the formation of the shock wave in a shock tube with an internal radius of 20 mm. Numerical simulations were performed for the driver-driven pressure ratio of 40 and the valve-opening speeds of 5, 10, and 20 m/s, which were compared with the case of instantaneous valve opening, and the results predicted by the ideal shock tube theory. The observed variables were the mass flow through the valve, as well as the pressure, the temperature, and the shock wave velocity in the formation region behind the valve. The results show that when the shock wave undergoes an initial acceleration, the shock front accelerates more at higher opening speeds of the valve. The results also show that the valve-opening mechanism generates a series of reflection waves that propagate into the driven section, giving the shock wave velocity an oscillatory character, which can affect the calibration and measurement capability of the shock tube as a primary high-frequency, time-varying, pressure calibration standard.

• Language: English
• Keywords: diaphragmless shock tubes, numerical simulations, OpenFOAM, primary calibration method, shock wave formation, time-varying pressure
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: Str. 158-168
• Numbering: Vol. 24, no. 1
• PID: 20.500.12556/RUL-153408
• UDC: 531.7:519.62
• ISSN on article: 1530-437X
• DOI: 10.1109/JSEN.2023.3333323
• COBISS.SI-ID: 179395587
• Publication date in RUL: 04.01.2024

Record is a part of a journal

• Title: IEEE sensors journal
• Shortened title: IEEE sens. j.
• Publisher: Institute of Electrical and Electronics Engineers
• ISSN: 1530-437X
• COBISS.SI-ID: 22563589

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: brezmembranske udarne cevi, numerične simulacije, OpenFOAM, primarna kalibracijska metoda, formiranje udarnega vala, časovno spreminjajoči tlak

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: J2-3054
• Name: Napredni sistem udarne cevi za visokofrekvenčno primarno dinamično tlačno umerjanje

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0223
• Name: Prenos toplote in snovi