DDT Database - Chair of Thermodynamics

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<li class="accordion-item c-sitenav__item-children"> <a href="/en/td/vacancies/student-assistant/" target="_self" title="Student Assistant"> Student Assistant </a> </li> </ul> </div> </div> </li> <li class=""> <a href="/en/td/public-procurements/" target="_self" title="Public Procurements"> Public Procurements </a> </li> </ul> </nav> </div> </div> </div> <div class="col-md-6 col-xl-8 c-content-area__main js-link-checker"> <nav aria-label="breadcrumbs" class="c-breadcrumb"> <ol class="c-breadcrumb__list"> <li class="c-breadcrumb__item "> <a href="/en/td/home/" title="|" class="c-breadcrumb__link">Home</a> </li> <li class="c-breadcrumb__item "> <a href="/en/td/research/" title="Research" class="c-breadcrumb__link"> Research </a> </li> <li class="c-breadcrumb__item cur"> <a aria-current="page" title="DDT Database" class="c-breadcrumb__link"> DDT Database </a> </li> </ol> </nav> <div id="content" class="c-main"> <div id="c3258" class="frame frame-type-textmedia frame-layout-0"> <h2> DDT Database </h2> <p>Welcome to the "GraVent DDT database", an open-access platform, which first went online in July 2015. It provides data from experiments on flame acceleration, deflagration-to-detonation transition (DDT) and detonation propagation which were carried out at the GraVent facility at the Technical University of Munich. This set-up is a completely enclosed rectangular laboratory scale explosion channel with a height of 0.06 m, a width of 0.3 m and a variable length of up to 5.4 m. So far the main focus has been placed on hydrogen-air mixtures at initially ambient pressure and temperature. Both conventional data (photodiodes, pressure transducers) and results from optical high-speed measurements (shadowgraphy, 20 kHz OH-PLIF) are provided.</p> <p>The presented work is funded by the German Federal Ministry of Economic Affairs and Energy (BMWi) on the basis of a decision by the German Bundestag (projects 1501338 and 1501425) which is gratefully acknowledged.</p> </div> <a id="c3257"></a> <div class="ce-textpic ce-center ce-above" > <div class="ce-gallery ce-gallery-full" data-ce-columns="1" data-ce-images="1" > <div class="ce-outer"> <div class="ce-inner"> <figure class="image"> <a href="/fileadmin/w00cgc/td/Forschung/Temp_Boeck/DDT_database_poster_ICDERS2015.pdf" class="ti ti-link"> <picture><img class="image-embed-item" loading="lazy" src="/fileadmin/_processed_/e/4/csm_DDT_database_poster_ICDERS2015_09ba435afc.webp" width="400" height="573" alt="" /></picture> </a> </figure> </div> </div> </div> </div> <div id="c3256" class="frame frame-type-textmedia frame-layout-0"> <h2> How to Cite the GraVent DDT Database </h2> <p><strong>If you work with our data please cite us as follows:</strong></p> <p>Boeck, L. R., Katzy, P., Hasslberger, J., Kink, A., & Sattelmayer, T. (2016). The GraVent DDT database. Shock Waves, online first 03/2016</p> </div> <div id="c3255" class="frame frame-type-textmedia frame-layout-0"> <h2> Getting Started </h2> <p>This platform consists of the actual <a href="/en/td/forschung/ddt/database/" target="_top" class="internal-link" title="Opens link in current Window">DDT database</a>. However it also provides a <a href="/en/td/forschung/ddt/database-guidelines/" target="_top" class="internal-link" title="Opens link in current Window">guide for accessing and interpreting the data</a> as well as information on the <a href="/en/td/forschung/ddt/experimental-setup/gravent-explosion-channel/" target="_top" class="internal-link" title="Opens link in current Window">experimental setup</a> and applied <a href="/en/td/forschung/ddt/experimental-setup/measurement-techniques/" target="_top" class="internal-link" title="Opens link in current Window">measurement techniques</a>. These components are organized as sub-sections accessible via the menu bar on the left.</p> <p>Before you download and use data we strongly encourage you to read the <a href="/en/td/forschung/ddt/database-guidelines/" target="_top" class="internal-link" title="Opens link in current Window">database guidelines</a> and look at the <a href="/en/td/forschung/ddt/experimental-setup/" target="_top" class="internal-link" title="Opens link in current Window">experimental setup</a>.</p> <p>The content of the database is continuously being updated. Please find the update history at the bottom of this page.</p> <p>If you do not find specific data that you would like to use for your work, please do not hesitate to <a href="/en/td/forschung/ddt/contact-us/" target="_top" class="internal-link" title="Opens link in current Window">contact us</a>. Also if you have any questions about the data interpretation, please let us know. Last but not least, we would be glad to hear your feedback on the database and its content.</p> </div> <div id="c3254" class="frame frame-type-textmedia frame-layout-0"> <h2> Background Information on DDT Research at TUM </h2> <p> Our motivation for the investigation of DDT, especially in hydrogen-air mixtures, is based on hydrogen explosion hazards in nuclear reactors. During severe accident scenarios such as loss-of-coolant accidents (LOCA), large amounts of hydrogen can be produced and dispersed inside a nuclear reactor building. Hydrogen mixes with air which forms a flammable mixture. Since potential ignition sources are omnipresent in such facilities, ignition is probable. Depending on the extent of the confining geometry, congestion (obstacles inside the geometry) and mixture composition, flame acceleration may occur. Fast flames pose a severe hazard due to high overpressure (up to about 10 bar, starting from initially ambient pressure). If critical conditions are reached transition to detonation may occur. This violent local process transforms the fast flame (fast deflagration) into a detonation which is typically considered a worst case explosion scenario, causing overpressure of up to about 20 bar. Laboratory scale experiments like the ones presented here help to understand the physics behind flame acceleration, DDT and detonation phenomena. During the past few years research at TUM has been mainly directed towards the effect of spatial concentration gradients on DDT.</p> </div> <div id="c3253" class="frame frame-type-textmedia frame-layout-0"> <h2> Update History </h2> <ul><li>22/07/2015 OH-PLIF and shadowgraphy data from transverse concentration gradient experiments uploaded </li><li>17/07/2015 OH-PLIF and shadowgraphy data from experiments on homogeneous H2-air mixtures now available </li><li>10/07/2015 platform goes online for the first time providing conventional data on dry homogeneous and inhomogeneous H2-air mixtures tested in unobstructed and obstructed configurations, as well as homogeneous mixtures with water mist injection.</li></ul> </div> </div> <div class="c-link-to-top js-link-to-top"> <a href="#topbar" title="go back to the top of the page"> To top </a> </div> </div> <div class="col-md-3 col-xl-2 c-content-area__aside js-link-checker"> <div id="sidebar" class="sidebar"> <aside class="c-aside"> <div id="c3276" class="frame frame-type-textmedia frame-layout-0"> <h3> Lehrstuhl für Thermodynamik </h3> <p>Prof. Dr. Dongsheng Wen</p> <p>Technische Universität München<br>Boltzmannstr. 15<br>D-85747 Garching</p> <p>Tel.: +49 (0)89 / 289-16217<br>Fax: +49 (0)89 / 289-16218</p> <h4>Quick Links:</h4> <p><a href="/en/td/research/publications/" target="_top" class="internal-link">Publikationen</a><br><a href="/en/td/vacancies/" target="_top" class="internal-link">Stellenangebote</a><br><a href="/en/td/academics-teaching/student-projects-and-theses/" target="_top" class="internal-link">Studien- und Abschlussarbeiten</a></p> </div> </aside> </div> </div> </div> </div> </main> <footer class="c-footer"> <div class="c-footer__legal"> <nav class="container" aria-label="legal links"> <ul class="list-inline"><li class="list-inline-item"><a href="/en/td/datenschutz/">Privacy</a></li><li class="list-inline-item"><a href="/en/td/impressum/">Imprint</a></li><li class="list-inline-item"><a href="/en/td/barrierefreiheit/">Accessibility</a></li></ul> <img aria-hidden="true" src="https://tum.de/hsts/default" height="1" width="1" /> </nav> </div> </footer> <script type="module" src="/_frontend/sitetum/bundled/assets/main-Ccf65gYE.js?1732259416"></script> <script data-ignore="1" data-dp-cookiedesc="layout" nonce="r4yQ8K8saqmpYnk6Z8aXntexdOazRr6Oix_OAVRGdumMUUEJWU27LA" type="text/plain"> This website uses cookies to accelerate usability. <a aria-label="learn more about cookies" class="cc-link" href="/en/td/datenschutz/#AktiveKomponenten" rel="noopener noreferrer nofollow" target="_blank" > More information </a> </script> <script data-ignore="1" data-dp-cookieselect="layout" nonce="r4yQ8K8saqmpYnk6Z8aXntexdOazRr6Oix_OAVRGdumMUUEJWU27LA" type="text/plain"> <div class="dp--cookie-check" xmlns:f="http://www.w3.org/1999/html"> <label for="dp--cookie-required"> <input class="dp--check-box" id="dp--cookie-required" tabindex="-1" type="checkbox" name="" value="" checked disabled> necessary </label> <label for="dp--cookie-statistics"> <input class="dp--check-box" id="dp--cookie-statistics" tabindex="1" type="checkbox" name="" value=""> statistics </label> </div> </script> <script data-ignore="1" data-dp-cookierevoke="layout" nonce="r4yQ8K8saqmpYnk6Z8aXntexdOazRr6Oix_OAVRGdumMUUEJWU27LA" type="text/plain"> <button type="button" aria-label="revoke cookie consent" class="dp--revoke {{classes}}" > <i class="dp--icon-fingerprint"></i> <span class="dp--hover">Cookie Policy</span> </button> </script> <script data-ignore="1" data-dp-cookieiframe="layout" nonce="r4yQ8K8saqmpYnk6Z8aXntexdOazRr6Oix_OAVRGdumMUUEJWU27LA" type="text/plain"> <div class="dp--overlay-inner" data-nosnippet> <div class="dp--overlay-header">{{notice}}</div> <div class="dp--overlay-description">{{desc}}</div> <div class="dp--overlay-button"> <button class="db--overlay-submit" onclick="window.DPCookieConsent.forceAccept(this)" data-cookieconsent="{{type}}"> {{btn}} </button> </div> </div> </script> <script data-ignore="1" nonce="r4yQ8K8saqmpYnk6Z8aXntexdOazRr6Oix_OAVRGdumMUUEJWU27LA" type="text/javascript"> window.cookieconsent_options = { overlay: { notice: true, box: { background: 'rgba(48,112,179,.75)', text: '#fff' }, btn: { background: '#b81839', text: '#fff' } }, content: { message:'This website uses cookies to accelerate usability.', dismiss:'allow cookies', allow:'save', deny: 'necessary <span></span>cookies', link:'More information', href:'/en/td/datenschutz/', target:'_blank', 'allow-all': 'all cookies', config: 'customize', 'config-header': 'Customize Consent Preferences', cookie: 'Cookies', duration: 'Duration', vendor: 'Vendor', media: { notice: 'Cookie Notice', desc: 'Loading this resource will connect to external servers which use cookies and other tracking technologies to personalize and improve experience. 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