Pulse Jet Engine Jeff Dennen Justin Marriott Brian Melo Matt Skillin Project Our project is to design and build a pulse jet engine We plan to make the engine as efficient as possible with the budget that we have set. BM Plan We are first going to create different designs and then do a design matrix to determine the best design We are then going to do hand calculations to determine the best way to design the jet engine to provide maximum thrust. We then are going to create a Solidworks model Finally we will build and test against our hand calculations. JD What is a pulse jet engine? A Pulse Jet is an engine that works on combustion in phases called pulses These engines are usually mad using no moving parts Pulse jets were used by the German’s in WWII, they were used as a bomb called the “buzz bomb” because of the sound of the bomb made. JM How does it work? The primary effect behind the function of a pulsejet is the fact that gases are compressible and tend to act like a spring. This “springiness” is crucial to the way a pulsejet draws in a fresh mixture of air and fuel then expels the hot burning gasses that are generated when that fuel is ignited. Copyright 2004, 2005 Bruce Simpson. http://www.pulsejetbook.com MS Kinds of Pulse Jets Valve: Pedal or spring valve construction Harder to build More Expansive Valve-less: No moving parts Easier to build Cheaper JM Calculations Thrust ENGLISH (pounds / inches) Metric (Kg / cm) 100 45 Exhaust Pipe Diameter B 5.64332648 14.26219894 Tailpipe Length C 62.37815104 157.8325874 Combustion Chamber Length D 12.47563021 31.56651749 Exhaust Cone Length E 12.47563021 31.56651749 Exhaust Pipe Length F 37.42689063 94.69955246 Combustion Chamber Dia (G) For Following Valve Type Petal Valve System 11.28665296 28.52439787 High Efficiency Petal Valve 8.922882628 22.55051654 Valve Grid 8.226491308 20.79054898 Valve Head Length (Tuned) 9.356722657 23.67488812 Estimated Frequency 81.27845913 Low 81.59151547 Low 87.53064829 High 87.86778589 High Bibliography Simpson Bruce “The Enthusiasts' Guide to Pulsejet Engines” http://www.aardvark.co.nz/pjet/ http://www.zachmiers.com/pulsejetbook/ http://www.pulse-jets.com/ Roy, Gabriel “Combustion processes in propulsion control, noise, and pulse detonation” o MS Questions?