使用微脉冲爆破发动机对 Scramjet Combustor 中的低频主动激励进行实验研究

Keon-Hyeong Lee, Min-Su Kim, Jeong-Yeol Choi, Kenneth H. Yu
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引用次数: 0

摘要

我们设计了一种微脉冲引爆发动机(μPDE),并将其安装在釜山大学(PNU-DCSC)的直连式喷气燃烧器上。利用工作频率为 10-20 Hz 的 μPDE 对扰动喷气燃烧器的主动激励进行了实验研究。在马赫数为 2.0、总温度为 1600 K、总压力为 1.68 MPa 的条件下,使用了增焓空气加热器(VAH)向隔离器和扰流喷气燃烧器提供高焓增焓空气。μPDE 的出口位于扰流喷气燃烧器的空腔中心。在等效比为 0.111 和 0.163 时进行了主动激励,并通过 Schlieren 记录和底壁压力测量分析了特性。结果是,当μPDE 发出的爆燃进入扰流喷气燃烧器时,瞬间形成了一列冲击波,并在扰流喷气燃烧器内向前移动。火焰瞬间从空腔剪切层火焰转变为空腔火焰。通过底壁压力测量,还观察到主动激波导致空腔附近的压力比未进行主动激波时显著增加。这揭示了燃烧特性,表明扰流喷射燃烧器中的压力增加提高了燃烧效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Experimental Investigation of Low-Frequency Active Excitation in Scramjet Combustor Using a Micro-Pulse Detonation Engine
A micro-pulse detonation engine (μPDE) was designed and installed to a direct-connect scramjet combustor of Pusan National University (PNU-DCSC). The active excitation on the scramjet combustor was experimentally studied using the μPDE operating at frequencies of 10–20 Hz. A vitiation air heater (VAH) was used to supply high-enthalpy vitiated air to the isolator and the scramjet combustor at a Mach number of 2.0, with a total temperature of 1600 K and a total pressure of 1.68 MPa. The exit of μPDE was located at the center of the cavity of the scramjet combustor. Active excitation was performed at equivalence ratios of 0.111 and 0.163, and characteristics were analyzed through Schlieren recording and bottom wall pressure measurement. As a result, when the detonation emitted from the μPDE entered the scramjet combustor, it instantly formed a shock train and moved forward within the scramjet combustor. The flame instantaneously changed from the cavity shear layer flame to the cavity flame. Through bottom wall pressure measurement, it was also observed that active excitation resulted in a significant pressure increase near the cavity compared to when active excitation was not performed. This revealed combustion characteristics, indicating improved combustion efficiency from the pressure increase in the scramjet combustor.
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