Piezo-resonance igniter and ignition method for propellant liquid rocket engine

1. An ignition system for a combustor comprising:

a resonance system which generates an oscillation pressure force by a resonant flow interaction between two parallel interconnected flow passages are separated by a split leg resonator which carry an incompressible flow;

a piezoelectric system driven by the oscillation pressure force of said resonance system; and

an igniter powered by said piezoelectric system.

2. The ignition system as recited in claim 1 , wherein said split leg resonator having a first leg and a second leg which form a generally triangular relationship.

3. The ignition system as recited in claim 2 , wherein a gas resonance tube is in communication with said first leg of said split leg resonator to generate said oscillating pressure force within said gas resonance tube.

4. The ignition system as recited in claim 3 , wherein said gas resonance tube is sealed with a force transmission diaphragm, a force transfer member in contact with said force transmission diaphragm.

5. The ignition system as recited in claim 4 , wherein said force transfer member includes a force transfer rod and a force transfer platen, said force transfer platen in contact with said force transmission diaphragm.

6. The ignition system as recited in claim 5 , wherein said force transfer platen is of a larger diameter than said force transfer rod and the force transfer diaphragm is of larger diameter than said resonance tube.

7. The ignition system as recited in claim 6 wherein said force transfer rod is in contact with a piezoelectric crystal stack of said piezoelectric system.