Shock tubes

European Union

Description

Compression in the low pressure chamber
Energy research

Sujets

• Sciences et techniques

Informations

• Publié par: EUROPEAN-UNION
• Nombre de lectures: 35
• Langue: English
• Poids de l'ouvrage: 2 Mo

Extrait

ât^ JO ¿íy
Commission of the European Communities
nuclear science and technology
SHOCK TUBES:
COMPRESSIONS IN THE LOW
PRESSURE CHAMBER
Report
EUR 10687 EN
Blow-up from microfiche original Commission of the European Communities
nuclear science and technology
SHOCK TUBES:
COMPRESSIONS IN THE LOW
PRESSURE CHAMBER
H. SCHINS, S. GIULIANI
Commission of (he European Communities
Joint Research Centre
Ispra Establishment
1-21020 Ispra
PAPL Π'· '. · it'.
Directorate-General Science, Research and Development
Joint Research Centre
cJEUR 10687 Eh 1986 Published by the
COMMISSION OF THE EUROPEAN COMMUNITIES
Directorate-General
Telecommunications, Information Industries and Innovation
Bâtiment Jean Monnet
LUXEMBOURG
LEGAL NOTICE
Neither the Commission of the European Communities nor any person acting on behalf
of then is responsible for the use which might be made of the following
information
© ECSC — EEC — EAEC, Brussels-Luxembourg, 1986 III
ACKNOWLEDGEMENT
The present study has to be understood as a first step of investigating
expansion works and conversion degrees under given conditions. Such
evaluations are needed there, in industrial and nuclear safety, where
vapor explosions might occur. Many impulses and stimulations for this
work we got from the Institut für Kernenergetik und Energiesysteme, IKE,
of the University of Stuttgart. Especially to Prof. Dr. Ing. H. Unger
and his group, M. Burger and C.Caracha!ios, are due our most sincere
acknowledgements and appreciations.
The work in the laboratory was performed mostly by C.Bourgeois, R. Cagnoli
and K. Klein. Also their contribution is gratefully acknowledged.
oooooooooooooooooo ABSTRACT
The gas shock tube used in these experiments consists of a low pressure
chamber and a high pressure chamber, divided by a metal-diaphragm-to-
rupture. In contrast to the shock mode of operation, where incident
and reflected shocks in the low pressure chamber are studied which
occur within 3.5 ms, in this work the compression mode of operation
was studied, whose maxima occur (in the low pressure chamber) about
9 ms after rupture. Theoretical analysis was done with the finite ele­
ment computer code EURDYN-lM, where the computation was carried out
to 30 ms.
The compression mode was enforced by inserting on the low pressure
side, just behind the diaphragm, a small piston. In the corresponding
analysis the computation time was up to 112 ms, because the first pres­
sure maximum occurred after 40 ms.
Results showed that the work done on the low pressure gas could be
approached with adiabatic compression. It was extrapolated that at
high pressure loads, the work done corresponded to 1.5% of the potential
energy in the high pressure chamber when no piston was used, and to
4% when a piston was used. VII
CONTENTS
MAIN REPORT Page
1. INTRODUCTION 1
2. SIMPLE ANALYSIS, ENGINEERING EQUATIONS 2
3. THEORETICAL CONSIDERATIONS WITH EURDYN 3
4. SHOCK TUBE ASSEMBLY AND INSTRUMENTATION 5
5. EXPERIMENTAL RESULTS 6
6. DISCUSSION AND CONCLUSIONS 8
REFERENCES 10
EXPERIMENTAL DETAILS
7. REPETITION OF SOME SHOCK TUBE FUNDAMENTALS 3
8. THE NITROGEN SYSTEM 32
9. THE ARGON SYSTEM 44
10. THE HELIUM SYSTEM 51
11. THE C02/N2 SYSTEM9
12. EXPERIMENTS WITH PISTON 67
oooooooooooooooooooooooooo