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Lobe mixer capable of generating swirling jet

A mixer and lobe technology, which is applied to the structural design of forced mixers in an aero-engine afterburner, can solve the problems of increased weight and mixing loss, complicated connection structure of lobe mixers, etc., and achieves low mixing loss and simple structure. , enhance the effect of mixing

Inactive Publication Date: 2020-11-24
中国航发贵阳发动机设计研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the design of the lobe mixer is mainly by adjusting the characteristic parameters such as the width, height, and expansion angle of the lobe. In order to achieve higher mixing thermal efficiency, the connection structure of the lobe mixer will tend to be complicated, and the weight and mixing loss will increase. And other issues

Method used

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  • Lobe mixer capable of generating swirling jet
  • Lobe mixer capable of generating swirling jet
  • Lobe mixer capable of generating swirling jet

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Embodiment Construction

[0022] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0023] Such as figure 1 Shown is that the existing forced mixing afterburner includes a central cone 1 , a lobe mixer 2 , an afterburner fuel manifold 3 , a stabilizer 4 , a heat shield 5 , an outer wall of the cylinder 6 and a straightening strut 7 . The lobe mixer makes the internal high-temperature gas behind the support plate mix with the external low-temperature gas, and then the fuel injection is burned behind the stabilizer, which further increases the gas enthalpy and engine thrust. For small and medium bypass specific afterburners, the oxygen content of the inner gas is low and the temperature is high, and the oxygen content of the outer gas is high, but the temperature is low. The lobe mixer makes the temperature of the outer side after the mixer rise, Intrinsic oxygen content increased to improve afterburner efficiency.

[002...

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Abstract

The invention discloses a lobe mixer capable of generating swirling jet. Ridge lines of lobes of the mixer forms certain angles with the engine axis. The airflow angle before mixing of external bypassairflow is changed by the deflection angles of the lobes in the lobe mixer, so that swirling jet is generated after the external bypass airflow flows through the lobes, mixing of internal and external bypass airflow is enhanced, an additional connecting structure is not generated, and the structure is simple. The mixer can be applied to an afterburner with medium bypass ratio or a mixed exhaust device with medium and small bypass ratio, and the purposes of low mixing loss and high mixing thermal efficiency can be achieved.

Description

technical field [0001] The invention belongs to the structural design technology of a forced mixer of an afterburner of an aero-engine, and relates to a lobe mixer capable of generating swirling jet flow with a deflection angle. Background technique [0002] The lobe mixer is one of the main components of the small and medium bypass specific afterburner and the mixed exhaust device. The main function of the lobe mixer is to mix the inner and outer streams in different states, so that the The velocity, temperature, and pressure gradients gradually decrease, making the flow field tend to a relatively uniform state. The principle is that through the shape design of the mixer lobe, large-scale flow vortices and orthogonal vortices are induced between the inner and outer airflows, and the contact area of ​​the airflows is increased at the same time, so as to achieve the effect of forced mixing. In the mixed exhaust system of engines with small and medium bypass ratios, the high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23R3/12
CPCF23R3/12
Inventor 文清兰于小兵尹璐
Owner 中国航发贵阳发动机设计研究所
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