微型涡喷发动机引射特性研究

Study on Ejection Performance of Micro-turbojet Engine

组合循环动力发动机是实现空天融合的重要推进方式,引射是涡轮基组合循环发动机(TBCC)的关键模态,其实际工作过程十分复杂。为了分析引射模态特性,文中基于CFD技术辅以地面实验测量,以微型涡喷发动机作为基础发动机,分别研究了引射管的长度、直径和相对位置对引射作用的影响规律。研究结论对TBCC引射模态设计具有参考价值,为提出有效掺混和减小总压损失的方案提供借鉴。

Combined cycle engine was one of the important propulsion approaches to realize space-aeronautics integration. Injection was the key mode of the turbine-based combined cycle （TBCC） engine, and its actual operation process was very complicated. In order to analyze the characteristics of the ejection mode, based on CFD technology and ground-based experimental measurements, a micro-turbojet engine was used as the basic engine, the influence of the length, diameter and relative position of the ejector tube on ejection was studied. The conclusion had reference value for the design of TBCC ejection mode, and it provided references for the schemes of effective mixing and total pressure loss reduction.