Pulse detonation engine combustor and ignition method thereof

Abstract

The invention provides a pulse detonation engine combustor and an ignition method thereof. A large-size main detonation chamber is divided into a plurality of small-size zones, firstly the main detonation chamber is filled with air and fuel, then ignition is conducted with low energy in the first line of zone close to the left end wall of the detonation chamber, flame is accelerated to form hot jet flow large in energy and containing a large number of active groups in the small-size zone, and the hot jet flow enters the main detonation chamber; afterwards the jet flow collides with the left end wall face to cause shock focusing, flame speed is increased, and shock-wave strength is enhanced; and then through corresponding sequential control, mixed fuel in the second line of zone far away from the left end wall face is ignited with low energy, jet flow formed in the zone enters the main detonation chamber, and ignition energy is increased again. Compared with common ignition, the pulse detonation engine combustor and the ignition method thereof organically combine multipoint ignition, jet flow ignition, obstacle reinforcement turbulent flow, shock reflection focusing, small pipelineacceleration and other principles and methods, detonation waves can be generated in a shorter time and distance, and thus time and distance of DDT are shortened.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a pulse detonation engine combustion chamber and a detonation method thereof. Background technique [0002] Pulse detonation engine (PDE) is a self-pressurized (about 13-15 times) power device that uses high-temperature and high-pressure gas generated by pulse detonation waves to generate thrust, and can operate in a very wide flight Mach number range ( Ma=0~5), and can work efficiently at subsonic speed and supersonic speed. Pulse detonation engines are divided into air-breathing pulse detonation engines and rocket-type pulse detonation engines according to whether they have their own oxidant. In addition, the detonation combustion mode has the remarkable advantages of high thermal efficiency (49%) and fast combustion rate (2000m / s). The PDE with this technology has a high heat capacity, which enables the power plant to obtain greater unit thrust and lower fuel consumption. ...

AI Technical Summary

Problems solved by technology

At present, the methods to reduce the transition distance from slow ignition to detonation include Shchelkin spiral and other turbulence enhancement devices, or adopt some new ignition methods, such as: transient plasma ignition, ignition with distributed external ignition source, jet ignition, optical ignition and excited ignition. Wave focusing, etc., but how to effectively break through the bottleneck of the DDT process has not been well resolved

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