Ignition device and scramjet in supersonic cavity combustion chamber

Abstract

The invention provides an ignition device in a supersonic concave cavity combustion chamber and a super-combustion stamping engine. The supersonic combustion chamber is internally provided with a fuelinjection hole and a concave cavity, the fuel injection hole is arranged at the upper stream of the concave cavity, and the fuel injected through the fuel injection hole propagates in the direction of the supersonic airflow propagation in a main flow channel of the supersonic combustion chamber; and a flow guide plate is obliquely arranged on the bottom wall of the concave cavity in the directionof the supersonic airflow propagation in the main flow channel, the lower end of the flow guide plate is connected to the bottom wall of the concave cavity, a gap is formed in the lower end of the flow guide plate, and a spark plug used for ignition is arranged on the portion, below the inner side of the flow guide plate, of the bottom wall of the concave cavity. According to the ignition device,the flow guide plate is applied to the interior of the concave cavity so as to improve the local flow rate and the equivalence ratio in the concave cavity, so that the ignition enhancement effect isachieved.

Description

technical field [0001] The invention relates to the technical field of scramjet design, in particular to an ignition device in a supersonic cavity combustion chamber and a scramjet. Background technique [0002] Concave flame stabilizers are widely used in scramjet combustion chambers. The supersonic airflow flowing through the concave cavity will form a recirculation zone in the concave cavity, which can keep the flame in it all the time, and continue to ignite the upstream fuel as a new ignition source, so as to achieve flame stabilization. The concave cavity can integrate fuel injection, mixing enhancement and flame stabilization in the supersonic combustion chamber, and plays an important role in improving the performance of the scramjet engine. [0003] Fuel injection / ignition / flame stabilization / cooling integrated concave cavity, which is common in engineering at present, includes the integration of fuel injection, ignition, and flame stabilization, with the concave c...

AI Technical Summary

Problems solved by technology

In practical application, it is found that the defects of this technical solution are: the structure of the flow field inside the concave cavity is complicated, it is difficult to ensure a suitable local velocity and local equivalence ratio near the ignition position, which is not conducive to the formation and development of the initial fire core after the spark plug is ignited, and it is easy to ignition failure

Specifically, a spark plug is set on the bottom surface of the cavity, and a stopper is set in the downstream direction of the spark plug. When the spark plug is ignited, the initial fire nucleus formed at the ignition position cannot directly propagate along the bottom surface of the cavity due to the blocking effect, thereby causing the fire nucleus to withstand more Air flow dissipation effect, easy to ignite failure

Images