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EXPERIMENTAL STUDIES OF HIGH-PRESSURE CRYOGENIC FLAMES ON THE MASCOTTE FACILITY

机译:高压致冷火焰对马斯克装置的实验研究

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Combustion processes involved in cryogenic propellant LOX/H_2 systems are very complex. In order to improve understanding and modeling of such processes, a test facility, called Mascotte, was developed by ONERA in the early 1990s. A research program involving teams from universities and ONERA has run for several years on the Mascotte bench and the purpose of this article is to summarize the results of systematic research obtained at ONERA. The first part of the article briefly describes the test facility and the related low and high-pressure combustors. In the second part, findings of both qualitative and quantitative measurements using high-speed photography, shadowgraphy, backlighting, and Coherent Anti-Stokes Raman Scattering are presented and discussed for different operating conditions. Differences of flame structure in sub-and supercritical regimes are emphasized. In particular, imaging techniques show evidence of the absence of ligaments and droplets around the LOX jet at supercritical pressures. Differences of flame front behavior with pressure is also demonstrated with both shadowgraphy and CARS diagnostics.
机译:低温推进剂LOX / H_2系统涉及的燃烧过程非常复杂。为了增进对此类过程的理解和建模,ONERA在1990年代初开发了一种名为Mascotte的测试设施。一项由大学和ONERA组成的研究计划已经在Mascotte实验室工作了几年,本文的目的是总结在ONERA获得的系统研究结果。本文的第一部分简要介绍了测试设备以及相关的低压和高压燃烧器。在第二部分中,介绍并讨论了在不同的操作条件下使用高速摄影,阴影摄影,背光和相干反斯托克斯拉曼散射进行定性和定量测量的结果。强调了亚临界和超临界状态下火焰结构的差异。特别是,成像技术显示出在超临界压力下,LOX射流周围没有韧带和液滴的证据。阴影图像和CARS诊断程序也证明了火焰前部行为与压力的差异。

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