Pulse detonation combustion system
A pulse detonation combustion system includes: an inlet pipe; an intake cone disposed in the inlet pipe, having an end provided with a pneumatic valve, and including an atomizing air transfer tube, a fuel transfer tube, and a conical swirl nozzle connected to the atomizing air transfer tube and the fuel transfer tube; an atomizing air intake tube connected with the atomizing air transfer tube; a fuel supply tube connected with the fuel transfer tube; a pulse detonation combustion chamber located downstream of and communicated to the inlet pipe, and provided with a spark plug mounting seat for mounting a spark plug; a gas energy distribution adjustment device located downstream of and communicated to the pulse detonation combustion chamber; and a transition section located downstream of and communicated to the gas energy distribution adjustment device.
1. A pulse detonation combustion system, comprising:
an inlet pipe ( 1 );
an intake cone ( 2 ) disposed in the inlet pipe ( 1 ), having an end provided with a pneumatic valve ( 8 ), and comprising an atomizing air transfer tube ( 5 ), a fuel transfer tube ( 6 ), and a conical swirl nozzle ( 11 ) connected to the atomizing air transfer tube ( 5 ) and the fuel transfer tube ( 6 );
an atomizing air intake tube ( 3 ) extending from the inlet pipe ( 1 ) into the intake cone ( 2 ), and connected with the atomizing air transfer tube ( 5 );
a fuel supply tube ( 4 ) extending from the inlet pipe ( 1 ) into the intake cone ( 2 ), and connected with the fuel transfer tube ( 6 );
a pulse detonation combustion chamber ( 12 ) located downstream of and communicated to the inlet pipe ( 1 ), and provided with a spark plug mounting seat ( 14 ) for mounting a spark plug ( 13 );
a gas energy distribution adjustment device ( 15 ) located downstream of and communicated to the pulse detonation combustion chamber ( 12 ); and
a transition section ( 17 ) located downstream of and communicated to the gas energy distribution adjustment device ( 15 );
wherein the pneumatic valve ( 8 ) comprises:
a detonation wave cut-off plate ( 9 );
an intake orifice plate ( 7 ), having a first rectangular plate formed with a plurality of air intake holes evenly and equidistantly spaced apart from each other, and configured to stop the detonation wave cut-off plate ( 9 ); and
an intake cup ( 10 ), having a cavity and a side wall defining an opening at one end, and providing holes at the other end configured to stop the detonation wave cut-off plate ( 9 );
wherein an outlet of the conical swirl nozzle ( 11 ) is located in the cavity of the intake cup ( 10 ), and a gas channel is formed by the side wall of the intake cup ( 10 ) and the inlet pipe ( 1 ) to allow fresh air to flow into the pulse detonation combustion chamber ( 12 ), such that atomizing air from the conical swirl nozzle ( 11 ) is separated from the fresh air from the gas channel by the side wall of the intake cup ( 10 );
wherein the gas energy distribution adjustment device ( 15 ) comprises:
a plurality of gas baffles ( 16 ) with a same axial length, configured to divide the straight tubular cavity into a plurality of injecting channels with a convergence ratio or an expansion ratio.
2. The pulse detonation combustion system according to claim 1 , wherein the inlet pipe ( 1 ) has a rectangular cavity, and is configured to introduce air into the pulse detonation combustion chamber ( 12 ).
3. The pulse detonation combustion system according to claim 1 , wherein the intake cone ( 2 ) comprises a conical head and a cylindrical main body, and is configured to atomize a liquid fuel and inject the atomized fuel into the pulse detonation combustion chamber ( 12 ).
4. The pulse detonation combustion system according to claim 3 , wherein the conical swirl nozzle ( 11 ) of the intake cone ( 2 ) is configured to shear and break the liquid fuel into droplets under a shearing action of an atomizing air.
5. The pulse detonation combustion system according to claim 1 wherein the detonation wave cut-off plate ( 9 ) is movable in an axial direction of the intake cone ( 2 ).
6. The pulse detonation combustion system according to claim 5 , wherein when the pulse detonation combustion chamber ( 12 ) is filled with fresh air and the liquid fuel, the detonation wave cut-off plate ( 9 ) moves to a downstream direction of airflow under an action of an intake pressure until it is stopped by the intake cup ( 10 ) to completely cover the holes of the intake cup ( 10 ).
7. The pulse detonation combustion system according to claim 5 , wherein when a detonation combustion back-propagation wave is generated in the pulse detonation combustion chamber ( 12 ) and propagated upstream of the pulse detonation combustion chamber ( 12 ) towards the inlet pipe ( 1 ), the detonation wave cut-off plate ( 9 ) moves to an upstream direction of airflow under an action of a pressure of the detonation combustion back-propagation wave until it is stopped by the intake orifice plate ( 7 ) to completely cover the air intake holes of the intake orifice plate ( 7 ).
8. The pulse detonation combustion system according to claim 1 , wherein the pulse detonation combustion chamber ( 12 ) has a straight tubular cavity with a rectangular cross section, and is configured to fill and mix air and fuel to form a combustible mixture.
9. The pulse detonation combustion system according to claim 8 , wherein the spark plug ( 13 ) is configured to ignite the combustible mixture.
10. The pulse detonation combustion system according to claim 1 , wherein the gas energy distribution adjustment device ( 15 ) has a straight tubular cavity and is configured to separate a pulse detonation gas flow formed in the pulse detonation combustion chamber ( 12 ) into a plurality of fuel gas flows.
11. The pulse detonation combustion system according to claim 10 , wherein the convergence ratio ranges from 1.43 to 2.21 and the expansion ratio ranges from 1.44 to 1.90.
12. The pulse detonation combustion system according to claim 10 , wherein the plurality of injecting channels comprise at least one injecting channel with a convergence ratio and at least one injecting channel with an expansion ratio that are stacked in a radial direction, and the injecting channel with the convergence ratio and the injecting channel with the expansion ratio are alternately arranged.
13. The pulse detonation combustion system according to claim 12 , wherein the gas energy distribution adjustment device ( 15 ) is divided by three gas baffles ( 16 ) to form a first injecting channel, a second injecting channel, a third injecting channel and a fourth injecting channel.
14. The pulse detonation combustion system according to claim 13 , wherein the first injecting channel has an expansion ratio of 1.44, the second injecting channel has a convergence ratio of 2.21, the third injecting channel has an expansion ratio of 1.90, and the fourth injecting channel has a convergence ratio of 1.43.
15. The pulse detonation combustion system according to claim 1 , wherein the inlet pipe ( 1 ) has a length of 500 mm, a width of 200 mm, a height of 100 mm, and a wall thickness of 3 mm.
16. The pulse detonation combustion system according to claim 1 , wherein the pulse detonation combustion chamber ( 12 ) has a length of 1400 mm, a width of 200 mm, a height of 100 mm, and a wall thickness of 3 mm.
17. The pulse detonation combustion system according to claim 1 , wherein the gas energy distribution adjustment device ( 15 ) has an axial length of 300 mm, a width of 200 mm, a height of 100 mm, and a wall thickness of 3 mm.
18. The pulse detonation combustion system according to claim 1 , wherein the transition section ( 17 ) is configured to discharge a pulse detonation gas formed in the pulse detonation combustion chamber ( 12 ), and connect the gas energy distribution adjustment device ( 15 ) to a turbine component located downstream.