The influence of waveguide tubes on the signals received by remote pressure sensors measuring pressure histories in pulsed detonation engines (PDEs) and rotating detonation engines (RDEs) is studied computationally. Two types of pressure sensors are considered: low-frequency static pressure sensors and high-frequency sensors of pressure pulsations. Three approaches to solving the problem are used: based on Euler (inviscid flow), Navier–Stokes (laminar flow), and unsteady Reynolds-averaged Navier–Stokes (turbulent flow) equations. The approaches based on the inviscid and laminar flow models are shown to provide the best predictive capability. The laminar flow model is applied to analyzing the readings of pressure sensors installed remotely in the waveguide tubes attached to the hydrogen-fueled PDE, RDE, and detonation ramjet (DR). It is shown that the measurements of static pressure and pressure pulsations by remote pressure sensors do not correspond to the time-averaged mean and local instantaneous values of pressure in the combustors. The pressure time histories can be recovered based on the measurements and computational fluid dynamics calculations of the operation process. The latter is demonstrated by analyzing the results of test fires with a dual-duct DR model.

通过计算研究了波导管对远程压力传感器接收的信号的影响，该压力传感器测量脉冲爆震发动机（PDE）和旋转爆震发动机（RDE）中的压力历史。考虑了两种类型的压力传感器：低频静压力传感器和压力脉动的高频传感器。使用了三种解决问题的方法：基于Euler（无粘性流），Navier-Stokes（层流）和非稳态雷诺平均Navier-Stokes（湍流）方程。结果表明，基于无粘性和层流模型的方法提供了最佳的预测能力。层流模型用于分析远程安装在与氢燃料PDE，RDE和爆震冲压发动机（DR）相连的波导管中的压力传感器的读数。结果表明，远程压力传感器对静态压力和压力脉动的测量值不对应于燃烧室中压力的时间平均平均值和局部瞬时值。压力时间历史可以基于操作过程的测量结果和流体动力学计算来恢复。后者是通过使用双通道DR模型分析测试火灾的结果来证明的。