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Scramjet test flow reconstruction for a large-scale expansion tube, Part 1: quasi-one-dimensional modelling

机译：大型膨胀管的瘙痒喷射测试流程重建，第1部分：准一维建模

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摘要

Large-scale free-piston driven expansion tubes have uniquely high total pressure capabilities which make them an important resource for development of access-to-space scramjet engine technology. However, many aspects of their operation are complex, and their test flows are fundamentally unsteady and difficult to measure. While computational fluid dynamics methods provide an important tool for quantifying these flows, these calculations become very expensive with increasing facility size and therefore have to be carefully constructed to ensure sufficient accuracy is achieved within feasible computational times. This study examines modelling strategies for a Mach 10 scramjet test condition developed for The University of Queensland's X3 facility. The present paper outlines the challenges associated with test flow reconstruction, describes the experimental set-up for the X3 experiments, and then details the development of an experimentally tuned quasi-one-dimensional CFD model of the full facility. The 1-D model, which accurately captures longitudinal wave processes, is used to calculate the transient flow history in the shock tube. This becomes the inflow to a higher-fidelity 2-D axisymmetric simulation of the downstream facility, detailed in the Part 2 companion paper, leading to a validated, fully defined nozzle exit test flow.
机译：大型自由活塞驱动的膨胀管具有独特的总压力功能，使其成为开发访问到空间扰乱引擎技术的重要资源。然而，它们操作的许多方面很复杂，并且它们的测试流程从根本上不稳定并且难以测量。虽然计算流体动力学方法提供了用于量化这些流动的重要工具，但这些计算随着设施大小的增加而变得非常昂贵，因此必须仔细构造以确保在可行的计算时间内实现足够的精度。本研究探讨了为昆士兰大学X3设施开发的Mach 10 Scramjet测试条件的建模策略。本文概述了与测试流程重建相关的挑战，描述了X3实验的实验设置，然后详细调了整个设施的实验调整准一维CFD模型的开发。准确地捕获纵波工艺的1-D型号用于计算冲击管中的瞬态流动历史。这成为对下游设施的高保真2-D轴对称模拟的流入，在第2部分伴随纸上详述，导致验证，完全定义的喷嘴出口测试流程。

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