Database Guidelines - Chair of Thermodynamics

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Database Guidelines </a> </li> </ol> </nav> <div id="content" class="c-main"> <div id="c3214" class="frame frame-type-textmedia frame-layout-0"> <h1> Guidelines for Using the Database </h1> <p>Here we describe how you can access the data you are looking for and what the datasets actually look like.</p> <p>Review the description of the <a href="/en/td/forschung/ddt/experimental-setup/gravent-explosion-channel/" target="_top" class="internal-link" title="Opens link in current Window">GraVent explosion channel</a> for information on the geometrical configurations and mixtures that have been investigated. Currently, this includes experiments in H<sub>2</sub>-air mixtures with homogeneous and inhomogeneous H<sub>2</sub> distributions (transverse concentration gradients) in 10 geometrical configurations as well as experiments with water mist injection.</p> <p>Needless to say, we want to make sure that the data is interpreted correctly. You will find some guidelines for data interpretation below. However, this guide cannot be exhaustive since it takes some experience with the particular experiment to say whether an effect that you see in the data is really physically meaningful or biased by some characteristics of the experiment. Therefore, we strongly encourage you to <a href="/en/td/forschung/ddt/contact-us/" target="_top" class="internal-link" title="Opens link in current Window">contact us</a> if you see effects in the data that seem unexpected. We are happy to provide support.</p> </div> <div id="c3213" class="frame frame-type-textmedia frame-layout-0"> <h1> How to get the Data </h1> <div class="ce-textpic ce-right ce-intext" > <div class="ce-gallery js-colorbox" data-ce-columns="1" data-ce-images="3" > <div class="ce-row"> <div class="ce-column"> <figure class="image"> <a href="/fileadmin/w00cgc/td/Forschung/Temp_Boeck/selection.png" data-fancybox="gallery3213" data-media="(max-width: 520px);(max-width: 767px);(max-width: 1199px);(max-width: 1399px);(min-width: 1400px)" data-sources="/fileadmin/_processed_/a/0/csm_selection_9554039ca7.png; /fileadmin/_processed_/a/0/csm_selection_decdeffbde.png; /fileadmin/_processed_/a/0/csm_selection_91407b129d.png; /fileadmin/_processed_/a/0/csm_selection_75a8ba6f11.png; /fileadmin/_processed_/a/0/csm_selection_eee4355f02.png " data-caption="Fig. G.1.: Selection of data" aria-label="How to get the Data Open gallery here" class="ti ti-link-zoom"> <picture><img class="image-embed-item" loading="lazy" src="/fileadmin/_processed_/a/0/csm_selection_2dbd937d1b.webp" width="150" height="113" alt="" /></picture> </a> <figcaption class="image-caption">Fig. G.1.: Selection of data</figcaption> </figure> </div> </div> <div class="ce-row"> <div class="ce-column"> <figure class="image"> <a href="/fileadmin/w00cgc/td/Forschung/Temp_Boeck/data.png" data-fancybox="gallery3213" data-media="(max-width: 520px);(max-width: 767px);(max-width: 1199px);(max-width: 1399px);(min-width: 1400px)" data-sources="/fileadmin/_processed_/c/4/csm_data_bc2d0daf00.png; /fileadmin/_processed_/c/4/csm_data_10d3cc1153.png; /fileadmin/w00cgc/td/Forschung/Temp_Boeck/data.png; /fileadmin/w00cgc/td/Forschung/Temp_Boeck/data.png; /fileadmin/w00cgc/td/Forschung/Temp_Boeck/data.png " data-caption="Fig. G.2.: Data in a download folder" aria-label="How to get the Data Open gallery here" class="ti ti-link-zoom"> <picture><img class="image-embed-item" loading="lazy" src="/fileadmin/_processed_/c/4/csm_data_f692aba3ee.webp" width="150" height="40" alt="" /></picture> </a> <figcaption class="image-caption">Fig. G.2.: Data in a download folder</figcaption> </figure> </div> </div> <div class="ce-row"> <div class="ce-column"> <figure class="image"> <a href="/fileadmin/w00cgc/td/Forschung/Temp_Boeck/folders.png" data-fancybox="gallery3213" data-media="(max-width: 520px);(max-width: 767px);(max-width: 1199px);(max-width: 1399px);(min-width: 1400px)" data-sources="/fileadmin/w00cgc/td/Forschung/Temp_Boeck/folders.png; /fileadmin/w00cgc/td/Forschung/Temp_Boeck/folders.png; /fileadmin/w00cgc/td/Forschung/Temp_Boeck/folders.png; /fileadmin/w00cgc/td/Forschung/Temp_Boeck/folders.png; /fileadmin/w00cgc/td/Forschung/Temp_Boeck/folders.png " data-caption="Fig. G.3.: Folders in case of concentration gradient experiments" aria-label="How to get the Data Open gallery here" class="ti ti-link-zoom"> <picture><img class="image-embed-item" loading="lazy" src="/fileadmin/_processed_/5/6/csm_folders_bdc228a89d.webp" width="150" height="139" alt="" /></picture> </a> <figcaption class="image-caption">Fig. G.3.: Folders in case of concentration gradient experiments</figcaption> </figure> </div> </div> </div> <div class="ce-bodytext"> <p>Fist of all you decide which type of experiment (e.g. homogeneous H<sub>2</sub>-air mixture) and which geometrical configuration (e.g. BR00) you are interested in. You go to the <a href="/en/td/forschung/ddt/database/" target="_top" class="internal-link" title="Opens link in current Window">database</a> and select the download for the average H<sub>2</sub> concentration (e.g. 30 vol. %) you want to look at, cf. Fig. G.1.</p> <p>Hitting the download button will start the download of all measurements available for your H<sub>2</sub> concentration. You will obtain a zip file with this data that looks like Fig. G.2. in the case of the example BR00, homogeneous, 30 vol. %. You will see three experiments in this case. The data of each experiment is provided in an *.xls file. The file name contains our internal experiment number, blockage ratio, obstacle spacing, average H<sub>2</sub> concentration and diffusion time (to identify the concentration gradient if relevant). In addition, a *.jpeg file provides a quick overview of flame speed data if available for the specific experiment.</p> <p>In the case of concentration gradient measurements, your download folder will contain subfolders named according to the diffusion times identifying the concentration gradients, cp. Fig. G.3.</p> <p>Optical data is similarly organized. Each download contains all the optical data available for the specific configuration and H<sub>2</sub> concentration you selected. Explanation of the interpretation of the data is given in a *.txt file located in the folder.</p> </div> </div> </div> <div id="c3212" class="frame frame-type-textmedia frame-layout-0"> <h1> What a Dataset Contains </h1> <p>Each *.xls file contains three spreadsheets: <strong>Information; Flame speed; Overpressure</strong>. The structure of all *.xls files is the same so that you can access larger amounts of experiments easily with a VBA macro, for example.</p> <p>The <strong>information sheet</strong> provides general information on the experiment such as geometry and mixture parameters.</p> <p>The <strong>flame speed sheet</strong> provides flame speed over channel distance. This is a result of our photodiode measurements.</p> <p>The <strong>overpressure sheet</strong> provides overpressure traces from up to 8 pressure transducers. The location of each transducer is also given here.</p> </div> <div id="c3211" class="frame frame-type-textmedia frame-layout-0"> <h1> How to Interpret the Data </h1> <p>When interpreting the data you should be aware of some phenomena that are inherent to the applied measurement techniques:</p> <p><strong>Photodiodes: </strong></p> <p>Especially in lean mixtures and very slow experiments the signals recorded by the diodes are often not strong enough to determine flame arrival. In such cases, you might not find any flame speed data in the datasets.</p> <p>The accuracy of the photodiode measurements can only be guaranteed at flame speeds below about 1000 m/s. Beyond 1000 m/s, you might observe strong oscillations in measured velocity which are typically not physically meaningful. Do not over-interpret such experimental results. It might be more accurate to evaluate arrival times at pressure transducers for velocity measurement since the dynamic response of the transducers is more accurate. Also, if you observe inexplicable single spikes in a flame speed plot also at lower flame speed do not over-interpret this. Such spikes may be caused by contaminants on a photodiode from previous experiments. If you need help with the interpretation, please contact us.</p> <p><strong>Pressure transducers:</strong></p> <p>Pressure transducer signals may be influenced by so-called thermal shock. This effect typically occurs when the reaction zone passes a transducer and rapidly heats up the transducer diaphragm. It heats up quickly due to its low thermal capacity, whereas the transducer housing heats up much more slowly. This reduces the piezo crystal preload and leads to measured pressure values below the real physical value. It especially affects the long-term behavior since the effect builds up over time. Pressure can easily become negative behind the maximum pressure peak at a transducer due to thermal shock. We try to prevent this by coating the transducers with high temperature grease. However, many experiments show thermal shock at single transducers. Please be aware of this when you analyse the data.</p> <p>In our post-processing of the pressure transducer signals, a lowpass butterworth filter with a cut-off frequency of 45 kHz is applied to suppress amplitude overprediction due to the dynamic response of the transducers. This is an important step since higher frequencies, approaching the transducer eigenfrequency of 150 kHz, would lead to a strong response of the transducer and an amplitude overprediction. The 45 kHz cut-off frequency allows us to limit the overprediction to a maximum of 110 % of the real value. The pressure traces in the datasets are already filtered. If you want to compare the data with numerical simulations, the numerical data acquisition rate should be the same.</p> </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 type="module" src="/_frontend/sitetum/bundled/assets/fancybox-Db8kzSN4.js?1732259416"></script> <script data-ignore="1" data-dp-cookiedesc="layout" nonce="oE-xRUsiCX9sL3izwy6O7rl3RQEYhK6uLre0peNhdymf2V5EOwLDQw" 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="oE-xRUsiCX9sL3izwy6O7rl3RQEYhK6uLre0peNhdymf2V5EOwLDQw" 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="oE-xRUsiCX9sL3izwy6O7rl3RQEYhK6uLre0peNhdymf2V5EOwLDQw" 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="oE-xRUsiCX9sL3izwy6O7rl3RQEYhK6uLre0peNhdymf2V5EOwLDQw" 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="oE-xRUsiCX9sL3izwy6O7rl3RQEYhK6uLre0peNhdymf2V5EOwLDQw" 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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