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Valveless Pulsejet Designs

The Holy Grail of pulsejet designers is the valveless pulsejet to eliminate reed valves or other mechanical valves that wear out. A valveless design also minimizes complexity. An example of one such design: bg38-t.jpg
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Obviously, the potential limiting factor is thermo metal fatigue, i.e. meltdown. This would be especially important in an airplane which sees rapid changes in ambient temperature. pulse.jpg
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Explanatory cycle diagram. diagram.jpg
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Note here that the inlet, combustion chamber and exhaust tip are fairly cool, but t yellow hot the exhaust tube must be headed towards failure. e043.jpg
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Jetcart using the valveless pulsejet. jetcart.jpg
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