高压氢气发生泄漏时,近场区域会形成具有复杂激波的欠膨胀射流,使得低压射流积分模型无法直接应用于该场景。通常使用虚喷嘴模型为积分模型提供等效边界条件,但不同虚喷嘴模型与积分模型结合的效果有待评估。该文将常用的几种虚喷嘴模型与积分模型相结合,通过与实验数据对比评估了不同虚喷嘴模型与积分模型结合后的计算精度。研究结果表明：未采用动量守恒方程的虚喷嘴模型计算结果与实验测量值基本一致;而添加了动量守恒方程的虚喷嘴模型预测的质量通量更大,射流出口速度更高,浓度的衰减率更大,导致预测结果与实验数据相差较大。
Abstract
Underexpanded jets generated by high-pressure hydrogen leakage develop complex shock wave structures in the near-field region, making the conventional low-pressure jet integral model inapplicable for underexpanded jets. While notional nozzle models are usually used to provide equivalent boundary conditions for the integral model, the performance of combining different notional nozzle models with the integral model needs to be evaluated. This study combines several commonly used notional nozzle models with the integral model, and evaluates the calculation accuracy based on experimental data. The results show that the predictions agree well with the experimental data for the notional nozzle models that do not assume momentum conservation. However, for the notional nozzle models conserving momentum, the predicted nozzle exit mass flux, velocity and centerline concentration decay rate are larger, resulting in a significant deviation from the experimental data.
关键词
氢气 /
氢安全 /
欠膨胀射流 /
虚喷嘴 /
积分模型 /
浓度分布
Key words
hydrogen /
hydrogen safety /
underexpanded jets /
notional nozzle /
integral model /
concentration distribution
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基金
政府间国际科技创新合作重点专项（2023YFE0199100）; 国家自然科学基金（52176191）
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