Numerical study of non-ideal diaphragm rupture in expansion tube

Hiroyasu Mizuno, Keisuke Sawada, Akihiro Sasoh

Research output: Contribution to conferencePaperpeer-review

4 Citations (Scopus)


Non-ideal diaphragm rupture that causes significant flow disturbances in an expansion tube is examined numerically for the purpose of improving the performance of an expansion tube installed in Tohoku University. In this study, the axi-symmetric Navier-Stokes calculation that accounts for nonequilibrium thermochemical reactions is carried out for the entire transient flowfield in the expansion tube except for the high-pressure reservoir and compression tube sections where an ideal gas assumption is made. Several rupture models for the primary and the secondary diaphragms are assessed. Validity of each model is examined by comparing with the experimental data. It is shown that both shock speed and pressure profile in the shock tube and in acceleration tube sections are changed significantly in response to different rupture models. For the primary diaphragm, it is found that a gradually opening diaphragm model is appropriate, and its opening time is indicated. For the secondary diaphragm, a holding time and a diaphragm inertia models are examined. As a result, however, it is found that the best agreement with the corresponding experiment is provided when an ideal rupture model is employed. This is because the shock velocity in the present expansion tube is relatively large that makes the secondary diaphragm rupture close to that of ideal one. The duration time and properties of the test flow are also evaluated and compared with the experimental data.

Original languageEnglish
Publication statusPublished - 2002
Event40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States
Duration: 2002 Jan 142002 Jan 17


Other40th AIAA Aerospace Sciences Meeting and Exhibit 2002
Country/TerritoryUnited States
CityReno, NV

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering


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