气冷环向稳定器张角对混合扩压器性能影响

Effects of Air-Cooled Ring Stabilizator Opening Angle

关键词:  混合扩压器  气冷环向稳定器  张角  热混合效率  总压恢复系数

Key words:  The mixer and diffuser  Air-cooled ring stabilizator  Opening angle  Thermal mixing efficiency  Total-pressure recovery coefficient

摘要:

为了研究气冷环向稳定器张角对混合扩压器性能的影响规律，针对一种混合扩压器和气冷稳定器一体化新型结构，基于N-S方程建立了流场三维数值计算模型，采用数值模拟研究了气冷环向稳定器张角对混合扩压器流场、热混合效率和流动损失的影响规律。结果表明:在气冷稳定器的诱导作用下，外涵冷空气大量入侵内涵高温燃气，使内外涵流体之间进行强力掺混，大大提高了外涵冷空气温度；随着气冷环向稳定器张角的增大，稳定器堵塞比增大，流动损失增大，总压恢复系数减小；14°张角模型的混合扩压器总压恢复系数最大，其值为0.992，比最小值大0.002；此外，热混合效率随气冷环向稳定器张角的增加变化较小，加力燃烧室出口热混合效率最大值与最小值仅相差1.6%。

Abstract:

In order to study the effects of air-cooled ring stabilizator opening angle on performance of the mixer and diffuser，for a new type of the mixer-diffuser and air-cooled stabilizator integration structure，the three-dimensional numerical simulation model based on the N-S equation was created. Through numerical simulation，the flow field，thermal mixing efficiency and flow loss of effect of different air-cooled ring stabilizator opening angles in the mixer and diffuser were obtained. The results show that，with the induction effect of air-cooled stabilizator，a large number of the fan cold flow invades the high temperature gas of the core flow，so that making a strong mixing between the core and fan flow and greatly improving the temperature of the fan cold flow. With the growing opening angle of air-cooled ring stabilizator，the stabilizator blockage ratio and flow loss increase，but the total-pressure recovery coefficient declines. The model with 14° opening angle has the highest total-pressure recovery coefficient of 0.992，and larger 0.002 than the minimum value. Therefore，the thermal mixing efficiency of the mixer and diffuser change little as the air-cooled ring stabilizator opening angle increases，and the difference between the maximum value and minimum value of thermal mixing efficiency is only 1.6% at the afterburner outlet.