The detonation characteristics of methane–oxygen mixtures at pre-detonation pressures of 101–1,013 kPa were investigated in a detonation tube. Both pure methane–oxygen mixtures and mixtures with argon dilution were explored. Measurements made include cell sizes via soot foil, wave speed via high speed ion probes / pressure transducers, and temperature / H₂O molar concentration profiles via 100 kHz absorption spectroscopy. Measured cell widths agreed with predicted cell widths based on a ZND length correlation. In addition, the power law fit of cell width with pre-detonation pressure agreed with previous data at less than 101 kPa. Measured detonation wave speeds agreed within 3% of Chapmen-Jouguet for all cases. H₂O molar density and temperature were successfully captured up to 507 kPa. However, above 507 kPa pre-detonation pressure, low signal to noise ratio and poor spectral fits at the extreme conditions of the von Neumann spike resulted in unacceptable uncertainty. These results provide a unique dataset to validate kinetics models and high-fidelity computation fluid dynamics codes for methane-oxygen detonations at elevated pre-detonation pressures relevant to rotating detonation rocket engines.

在爆炸管中，研究了预爆炸压力为101–1,013 kPa时甲烷-氧气混合物的爆炸特性。研究了纯甲烷-氧气混合物和氩气稀释的混合物。进行的测量包括：通过烟灰箔的电池尺寸，通过高速离子探针/压力传感器的波速，以及通过100 kHz吸收光谱的温度/ H ₂ O摩尔浓度分布图。测得的像元宽度与基于ZND长度相关性的预测像元宽度一致。另外，爆震前压力下晶胞宽度的幂律拟合与以前的数据一致（小于101 kPa）。在所有情况下，测得的爆轰波速度均在Chapmen-Jouguet的3％之内。高₂成功地捕获了高达507 kPa的O摩尔密度和温度。然而，高于507 kPa的爆炸前压力，在冯·诺依曼峰值的极端条件下低信噪比和较差的频谱拟合会导致无法接受的不确定性。这些结果提供了一个独特的数据集，用于验证动力学模型和高保真计算流体动力学代码，以在与旋转爆震火箭发动机相关的升高的预爆压力下甲烷-氧爆轰。