A Nozzle Layout Method for Afterburner

Abstract

The invention provides an afterburner nozzle layout method. According to the method, flow field simulation is performed to obtain a plurality of equidistant sections with axial coordinates being constants; an oxygen dense flow value in each section airflow is calculated; each section is converted into a rectangular section, and original dense flow characteristics are inherited; the percentage GK of dense flow flux in a rectangular region formed by each radial node of each section and an initial boundary in total dense flow flux is calculated; the number n of nozzles needed in the radial direction and a GK value GKa at a radial structure position for isolating cooling airflow are determined according to design specifications; the GK value is equally divided into 2n parts according to the range from 0 to GKa, and radial coordinates corresponding to each part of the GK value at a demarcation point are solved; the radial positions corresponding to the same equally-divided GK value of each section are connected to obtain an oxygen dense flow line; and alternate intersection points of the oxygen dense flow line and a spray rod center line are selected to determine nozzle positions. Through the method, fuel and oxygen participating in burning can be finely matched and premixed uniformly, and the method is beneficial for improving afterburning efficiency.

Description

technical field [0001] The invention belongs to the field of aero-engines, in particular to an afterburner part, in particular to a nozzle layout method for an afterburner. Background technique [0002] In the design of the afterburner, the refinement of the fuel nozzle layout will directly affect the performance of the afterburner. In the nozzle layout design, the traditional method is to approximate the flow area of ​​the characteristic cross-section, and cannot consider the oxygen flow distribution after the mixing of the inner and outer streams. For the mixed intake afterburner, the degree of mixing of inner and outer airflows is large, and the key parameters reflecting the oxygen flow rate, such as the velocity, density, and oxygen concentration of the two airflows, have changed greatly (see figure 2 ), if the traditional area ratio method is used to design the nozzle layout, it can only be approximated as a uniform air flow, which will make the afterburner nozzle layo...

AI Technical Summary

Problems solved by technology

In the nozzle layout design, the traditional method is to approximate the flow area of ​​the characteristic cross-section, and cannot consider the oxygen flow distribution after the mixing of the inner and outer streams.

For the mixed intake afterburner, the degree of mixing of inner and outer airflows is large, and the key parameters reflecting the oxygen flow rate, such as the velocity, density, and oxygen concentration of the two airflows, have changed greatly (see figure 2 ), if the traditional area ratio method is used to design the nozzle layout, it can only be approximated as a uniform air flow, which will make the afterburner nozzle layout not match the actual oxygen flow distribution, which will bring large errors and affect the performance of the afterburner

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