Nozzles, nozzle arrays and burners with plasma actuators

Abstract

The invention provides a nozzle with plasma exciters. The nozzle with the plasma exciters comprises an outer cylinder, N layers of middle cylinders, an inner cylinder and a high-voltage power supply. The inner wall of the outer cylinder and the inner walls and the outer walls of the middle cylinders are each provided with one plasma exciter. The plasma exciters induce a mixture of fuel and air in an outer flow channel to do rotational motion. A mixture of fuel and air in an inner flow channel maintains axial motion and does not do rotational motion. Centrifugal force generated by rotational motion of fluid in the outer flow channel enables the fluid to expand in an outlet of the nozzle, the axial velocity of the fluid at the axis of the nozzle is decreased, and the burning stability is improved. Vortex breakdown and a strong backflow area are not generated at the outlet of the nozzle. The dwelling time of burning reactants in a high-temperature area is shortened, and generated NOx is reduced. Meanwhile, flow loss can be reduced, and backfire can be prevented. The output voltage of the high-voltage power supply can be automatically adjusted according to the burning state, the adjustment accuracy of the nozzle in the working state is improved, and the velocity of the nozzle in the working state is increased.

Description

Technical field [0001] The present invention relates to the technical field of combustion devices, in particular to a nozzle with a plasma exciter and a nozzle array, which is particularly suitable for various industrial burners such as gas turbines, boilers, and chemical furnaces. Background technique [0002] Gas turbines are widely used in electric power, aviation, petrochemical and other industries due to their small size and large output power. Due to the energy crisis and environmental degradation, there is an urgent need to develop an efficient and clean combustion chamber, which requires reliable ignition, stable combustion, high efficiency, and low emissions. The current environmental pollution problem in my country is very serious, and the development of clean combustion technology for gas turbines is very urgent. Gas turbine manufacturers have developed a variety of clean combustion technologies, such as lean premixed combustion technology, lean phase premixed preevap...

AI Technical Summary

Problems solved by technology

However, since the main flame is stable at the low-velocity edge of the shear layer, periodic vortex shedding will occur near the low-velocity region of the shear layer, and oscillations will easily occur near the stable point, and combustion instability will easily occur when operating in non-design conditions

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