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elementor-section-height-default" data-id="1e0b1719" data-element_type="section" data-settings="{"background_background":"classic"}"> <div class="elementor-background-overlay"></div> <div class="elementor-container elementor-column-gap-no"> <div class="elementor-row"> <div class="elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7ed9d635" data-id="7ed9d635" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-5bd1287b elementor-widget elementor-widget-heading" data-id="5bd1287b" data-element_type="widget" data-widget_type="heading.default"> <div class="elementor-widget-container"> <h1 class="elementor-heading-title elementor-size-default">Numerical simulation</h1> </div> </div> </div> </div> </div> </div> </div> </section> <section class="elementor-section elementor-top-section elementor-element elementor-element-06b2dec elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default" data-id="06b2dec" data-element_type="section"> <div class="elementor-container elementor-column-gap-no"> <div class="elementor-row"> <div class="elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-917bdec" data-id="917bdec" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <section class="elementor-section elementor-inner-section elementor-element elementor-element-b1c9d48 elementor-section-boxed elementor-section-height-default elementor-section-height-default" data-id="b1c9d48" data-element_type="section"> <div class="elementor-container elementor-column-gap-default"> <div class="elementor-row"> <div class="elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-ab156a0" data-id="ab156a0" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-276fb1a elementor-widget elementor-widget-image" data-id="276fb1a" data-element_type="widget" data-widget_type="image.default"> <div class="elementor-widget-container"> <div class="elementor-image"> <img decoding="async" src="https://crg.energia.bme.hu/wp-content/uploads/2022/02/atomization_CFD.png" title="atomization_CFD" alt="atomization_CFD" /> </div> </div> </div> </div> </div> </div> <div class="elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-20c7a67" data-id="20c7a67" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-bc620eb elementor-widget elementor-widget-heading" data-id="bc620eb" data-element_type="widget" data-widget_type="heading.default"> <div class="elementor-widget-container"> <h4 class="elementor-heading-title elementor-size-default">Mission</h4> </div> </div> <div class="elementor-element elementor-element-9b0869d elementor-widget elementor-widget-text-editor" data-id="9b0869d" data-element_type="widget" data-widget_type="text-editor.default"> <div class="elementor-widget-container"> <div class="elementor-text-editor elementor-clearfix"> <p>Our goal with numerical modeling is to perform calculations using tabulated chemistry models, which are simple and robust enough for industrial applications, evaluating liquid and gaseous fuel combustion. The real burner geometries are modeled with poly-hexcore cells. Atomization and evaporation of liquids are modeled in the Lagrangian frame. In this framework, a few hundred thousand cells and simplified models match the global flame characteristic. Also, pollutant emissions are evaluated. We are using principally the ANSYS Fluent software environment, the leading commercial CFD software.</p> </div> </div> </div> </div> </div> </div> </div> </div> </section> <section class="elementor-section elementor-inner-section elementor-element elementor-element-166fcc0 elementor-section-boxed elementor-section-height-default elementor-section-height-default" data-id="166fcc0" data-element_type="section"> <div class="elementor-container elementor-column-gap-default"> <div class="elementor-row"> <div class="elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-0a5f9e1" data-id="0a5f9e1" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-0376b91 elementor-widget elementor-widget-heading" data-id="0376b91" data-element_type="widget" data-widget_type="heading.default"> <div class="elementor-widget-container"> <h4 class="elementor-heading-title elementor-size-default">Swirl vanes</h4> </div> </div> <div class="elementor-element elementor-element-4debd97 elementor-widget elementor-widget-text-editor" data-id="4debd97" data-element_type="widget" data-widget_type="text-editor.default"> <div class="elementor-widget-container"> <div class="elementor-text-editor elementor-clearfix"> <p>The Mixture Temperature Controlled combustion concept notably differs from the known flames in the literature. Therefore, its simulation is a principal goal to understand its operation better. Since the burner geometry is highly modular, modifications can be estimated in advance to optimize the design. These parts include nozzles for gaseous and liquid fuels, swirl vanes, and combustion chamber geometry. A highlighted project is the evaluation of swirl vanes, hence the effect of vane angle. This analysis was initiated for natural gas combustion within the framework of a student project. The validations were performed by flame photos, Schlieren images, and NO<sub>x</sub> and CO emissions at 45掳 vane angle.</p> </div> </div> </div> </div> </div> </div> <div class="elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-df65bff" data-id="df65bff" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-d89d336 elementor-widget elementor-widget-image" data-id="d89d336" data-element_type="widget" data-widget_type="image.default"> <div class="elementor-widget-container"> <div class="elementor-image"> <img decoding="async" src="https://crg.energia.bme.hu/wp-content/uploads/2022/02/swirl.png" title="swirl" alt="swirl" /> </div> </div> </div> </div> </div> </div> </div> </div> </section> <section class="elementor-section elementor-inner-section elementor-element elementor-element-42100fd elementor-section-boxed elementor-section-height-default elementor-section-height-default" data-id="42100fd" data-element_type="section"> <div class="elementor-container elementor-column-gap-default"> <div class="elementor-row"> <div class="elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-1ce059a" data-id="1ce059a" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-c55d5c7 elementor-aspect-ratio-169 elementor-widget elementor-widget-video" data-id="c55d5c7" data-element_type="widget" data-settings="{"video_type":"hosted","controls":"yes","aspect_ratio":"169"}" data-widget_type="video.default"> <div class="elementor-widget-container"> <div class="e-hosted-video elementor-wrapper elementor-fit-aspect-ratio elementor-open-inline"> <video class="elementor-video" src="https://crg.energia.bme.hu/wp-content/uploads/2022/02/temperature_ammonia.mp4" controls="" controlsList="nodownload"></video> </div> </div> </div> </div> </div> </div> <div class="elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-cc21d9a" data-id="cc21d9a" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-82f5190 elementor-widget elementor-widget-heading" data-id="82f5190" data-element_type="widget" data-widget_type="heading.default"> <div class="elementor-widget-container"> <h4 class="elementor-heading-title elementor-size-default">Ammonia combustion modeling</h4> </div> </div> <div class="elementor-element elementor-element-ce175ee elementor-widget elementor-widget-text-editor" data-id="ce175ee" data-element_type="widget" data-widget_type="text-editor.default"> <div class="elementor-widget-container"> <div class="elementor-text-editor elementor-clearfix"> <p>Ammonia is a carbon-neutral energy carrier. Before direct application in boilers and gas turbines, its simulation is inevitable. Hence, in 2021, in cooperation with an MSc student, pure ammonia combustion was simulated in our lean premixed swirl burner system. It was found that the Flamelet Generated Model is appropriate for the simulation using Okafor鈥檚 reaction mechanism even near the lower flammability limit. The main problem of the combustion of pure ammonia is the huge NO<sub>x</sub> emission. Hence, we started collaborating with researchers of the Shanghai Jiao Tong University, who provided PIV data of their lean premixed swirl burner. During the simulation, Okafor鈥檚 ammonia-methane combustion mechanism was applied, and non-adiabatic flamelet generation model was used. The results were validated by PIV and OH* chemiluminescence measurements, showing a good match.</p> </div> </div> </div> </div> </div> </div> </div> </div> </section> <section class="elementor-section elementor-inner-section elementor-element elementor-element-8cff615 elementor-section-boxed elementor-section-height-default elementor-section-height-default" data-id="8cff615" data-element_type="section"> <div class="elementor-container elementor-column-gap-default"> <div class="elementor-row"> <div class="elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-2b96850" data-id="2b96850" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-c824541 elementor-widget elementor-widget-heading" data-id="c824541" data-element_type="widget" data-widget_type="heading.default"> <div class="elementor-widget-container"> <h4 class="elementor-heading-title elementor-size-default">Mixture Temperature Controlled combustion modeling</h4> </div> </div> <div class="elementor-element elementor-element-1bf5235 elementor-widget elementor-widget-text-editor" data-id="1bf5235" data-element_type="widget" data-widget_type="text-editor.default"> <div class="elementor-widget-container"> <div class="elementor-text-editor elementor-clearfix"> <p>Modeling of the resulting distributed combustion modeling was performed for diesel fuel by using the Flamelet Genereted Manifold model, and tweaking the parameters of Zimont turbulence model to decrease the turbulent flame speed and delay the ignition, well matching with Schlieren measurements, pollutant emissions, and acoustic spectra. The results bear high potential for the industry to design their own MTC combustion systems for stable, reliable, and environmentally friendly operation.</p> </div> </div> </div> </div> </div> </div> <div class="elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-02570eb" data-id="02570eb" data-element_type="column"> <div class="elementor-column-wrap elementor-element-populated"> <div class="elementor-widget-wrap"> <div class="elementor-element elementor-element-6a2711f elementor-widget elementor-widget-image" data-id="6a2711f" data-element_type="widget" data-widget_type="image.default"> <div class="elementor-widget-container"> <div class="elementor-image"> <img decoding="async" src="https://crg.energia.bme.hu/wp-content/uploads/2022/02/T_distributed.png" title="T_distributed" alt="T_distributed" /> </div> </div> </div> </div> </div> </div> </div> </div> </section> </div> </div> </div> </div> </div> </section> </div> </div> </div> </div> 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