Effect of Operating Frequency on PDE Driven Ejector Thrust Performance
Effect of Operating Frequency on PDE Driven Ejector Thrust Performance
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DOI：
10.2514/6.2005-3832
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发表时间：
2005-11
影响因子：
2.2
通讯作者：
R. Santoro;S. Pal;K. Landry;R. Shehadeh;N. Bouvet;Seong-Young Lee
中科院分区：
文献类型：
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作者：
R. Santoro;S. Pal;K. Landry;R. Shehadeh;N. Bouvet;Seong-Young Lee
介绍并讨论了脉冲爆震发动机驱动喷射器正在进行的研究结果。实验使用脉冲爆震发动机 (PDE) 进行，该发动机设计运行频率高达 50 Hz。这些实验中使用的PDE使用氧气和氮气的等摩尔混合物作为氧化剂，乙烯（C2H4）作为燃料，推进剂混合物的当量比为1。使用视线激光吸收技术来确定正确填充管所需的时间。使用与线性可变位移传感器耦合的集成弹簧阻尼器系统进行推力测量。首先在每个所需频率下测量偏微分方程的基线推力，并且与文献中的实验和建模结果一致。然后对恒定直径喷射器进行推力增大测量。喷射器具有不同的长度，并且针对每种喷射器配置测试了两种不同的入口几何形状。研究的参数空间包括偏微分方程运行频率、喷射器长度、重叠距离和喷射器入口的曲率半径。对于所研究的实验矩阵，结果显示在 30 Hz 的工作频率下最大推力增强为 106%。
Results of an on-going study of pulse detonation engine driven ejectors are presented and discussed. The experiments were conducted using a pulse detonation engine (PDE) designed to operate at frequencies up to 50 Hz. The PDE used in these experiments utilizes an equimolar mixture of oxygen and nitrogen as the oxidizer, and ethylene (C2H4) as the fuel, with the propellant mixture having an equivalence ratio of one. A line of sight laser absorption technique was used to determine the time needed for proper filling of the tube. Thrust measurements were made using an integrated spring damper system coupled with a linear variable displacement transducer. The baseline thrust of the PDE was first measured at each desired frequency and agrees with experimental and modeling results found in the literature. Thrust augmentation measurements were then made for constant diameter ejectors. The ejectors had varying lengths, and two different inlet geometries were tested for each ejector configuration. The parameter space for the study included PDE operation frequency, ejector length, overlap distance and the radius of curvature for the ejector inlets. For the studied experimental matrix, the results showed a maximum thrust augmentation of 106% at an operational frequency of 30 Hz.