Fall 2018 Graduate Fellows Symposium: Jessica Chambers

Fall 2018 Graduate Fellows Symposium: Jessica Chambers


[Music] hi good afternoon everyone my name is Jessica chambers I am a graduate research assistant at the propulsion and energy research laboratory and what I primarily focus on is understanding combustion phenomenon for aerospace applications. so to break it down a little bit some of the key machines that many of you may be familiar with that use combustion for propulsion is an airplane engine. so these are referred to as gas turbine engines so here we have a picture here on both sides of the wing you see those large machines they look like big fans but they’re actually much more complex. so here I have a schematic where you have that front part that looks like a big fan its suction its sections air. you have an intake of air that goes through multiple stages of compression so now you’ve got highly compressed air it comes into the combustion chamber so this is the part that’s more fundamental to my research Oh skips back I get 10 more seconds okay so in the combustion chamber that’s where we can inject fuel into this highly compressed air and now we have the perfect combination where we can ignite so you have stabilized steady flames at calm oh I think it’s touchscreen okay that’s why I’m just so my gestures are so large. okay so in the combustion chamber we have that combustion combustion process and that constant pressure and then out towards the back end the air is expanded and the hot gasses and flames accelerate out towards the back end and that’s how you have propulsion. so if we take a look into that combustion section we have I said stabilize steady constant pressure combustion and it’s also subsonic so you guys have may heard the terminology sonic sonic velocity something subsonic or supersonic most of our burning occurs at subsonic levels meaning below the speed of sound and the speed of sound is important as it adds a lot of complexities in terms of pressure dynamics and compression. So we normally do everything at subsonic levels but some of the technology that we want or some of the processes that we want to implement into the future combustion technology is supersonic combustion and one specific development is pressure gain combustion where you have instead of constant pressure you’ve got a rise in pressure in your system. Now we can use that high pressure and to to introduce higher thermodynamic efficiencies use less fuel so it’s a lot of very positive benefits to it if we’re able to understand it better. So a detonation is there’s a lot of research into this detonation but there are many challenges with this research including actually achieving detonation achieving the supersonic combustion is very difficult so there’s a lot of physical phenomenon that still needs to be understood and that’s what I do I get to blow things up and understand it and study it in a controlled environment but that’s what I do and if you guys want to understand more of that come to my poster. Thank you again [Applause] [Music] you

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