Numerical study on variable area afterburner with wide bypass ratio

宽涵道比后可变面积加力燃烧室数值研究

¹ National Elite Institute of Engineering, Northwestern Polytechnical University, Xi'an 710072, China
² School of Power and Energy, Northwestern Polytechnical University, Xi'an 710129, China
³ Sichuan Gas Turbine Establishment, Aero Engine Corporation of China, Chengdu 610500, China

Received: 7 May 2025

Abstract

To investigate the impact of variable geometry components on the performance of afterburner, the afterburner of triangular variable connotation components was designed, and the effects of the different state points and duct ratio on the total pressure recovery coefficient and combustion efficiency of afterburner were studied by using the CFD numerical simulation. The results show that the change of working state has significant influence on the working performance of afterburner, the total pressure recovery coefficient of the three state points is above 0.96 and the combustion efficiency is above 0.9 under the small bypass ratio, the difference from the performance parameters among the three state points increases with the increasing of bypass ratio, when the bypass ratio is 0.9 to 1.2, the total pressure loss of the afterburner is smaller, the combustion efficiency is better, the total pressure recovery coefficient is the lowest 0.962, the combustion efficiency is the lowest 0.897, and when the bypass ratio is 1.2 to 1.5, The pressure loss of afterburner is in the tolerance range, but the combustion efficiency begins to decrease greatly, and the combustion efficiency is only 0.58 when the total pressure recovery coefficient is 0.941, and when the duct ratio is 1.5 to 1.8, the afterburner is very poor in both pressure loss and combustion efficiency, and the total pressure recovery coefficient is 0.92, while the combustion efficiency is only 0.446.

摘要

为探究外涵可变几何部件对加力燃烧室性能影响, 设计了具有三角形外涵可变部件的加力燃烧室, 利用CFD数值模拟研究不同状态点及涵道比对加力燃烧室总压恢复系数及燃烧效率的影响。研究表明: 工作状态变化对加力燃烧室工作性能影响较大, 小涵道比下3种状态点总压恢复系数都在0.96以上, 燃烧效率都在0.9以上; 随着涵道比增大, 3种状态点间性能参数差值增大; 当涵道比为0.9~1.2时, 加力燃烧室总压损失较小, 燃烧效率较优, 总压恢复系数最低为0.962, 燃烧效率最低为0.897;当涵道比为1.2~1.5时, 加力燃烧室压力损失处于承受范围内, 但是燃烧效率开始大幅降低, 总压恢复系数为0.941时燃烧效率仅有0.58;当涵道比为1.5~1.8时, 加力燃烧室无论是压力损失还是燃烧效率都很差, 总压恢复系数为0.92, 而燃烧效率只有0.446。