Emission measurements from unsteady combustion systems such as Pulse Detonation Combustion (PDC) are challenging due to the inherently large variations in pressure, temperature, composition, and flow velocity of the exhaust gas. Comparison of experimental data is additionally complicated by differences in operating conditions and gas sampling setup between different facilities. Qualitative considerations with regard to the sampling process from PDC, based on one-dimensional simulations, indicate a systematic influence of the sampling setup and extraction process on the resulting concentration measurements. Therefore, operating frequency, sample time, fill time, as well as PDC outlet and probe geometry were varied experimentally in order to assess the degree to which each of these parameters impact the resulting measured \({\rm NO}_{\rm x}\) in order to better inform researchers of these effects when making measurements. It was shown that measured \({\rm NO}_{\rm x}\) emissions can vary significantly depending on the choice of these parameters and therefore care must be exercised in order to reduce the influence of the sampling technique when aiming for comparable results.

由于废气的压力，温度，成分和流速的内在变化很大，因此来自不稳定燃烧系统（例如脉冲爆震燃烧（PDC））的排放测量具有挑战性。由于不同设备之间的操作条件和气体采样设置的差异，使实验数据的比较更加复杂。基于一维模拟，有关PDC采样过程的定性考虑表明采样设置和提取过程对所得浓度测量值的系统影响。因此，通过实验改变工作频率，采样时间，填充时间以及PDC出口和探头的几何形状，以评估这些参数中的每一个对结果的影响程度。\（{\ rm NO} _ {\ rm x} \），以便在进行测量时更好地告知研究人员这些影响。结果表明，测得的\（{\ rm NO} _ {\ rm x} \）排放量可能会根据这些参数的选择而显着变化，因此，在进行采样时，必须谨慎行事，以减少采样技术的影响。可比的结果。