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Instantaneous pressure measurement in pulsating high temperature internal flow in ducts

机译：管道中脉动高温内部流动的瞬时压力测量

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Research tasks in internal combustion engines often require instantaneous pressure measurement of the gases inside the exhaust manifold including absolute value information. In such environment, flow operation includes high temperature and extremely pulsating conditions. The work described in the paper identifies the problems that arise when acquiring absolute pressure with a piezoresistive transducer. A methodology based on using an additional cooler for a piezoresistive sensor placed between the duct and the original sensor cooler adaptor is proposed for dynamic pressure measurement. Specific tests have been performed in cold and hot pulsating flow in order to check the influence of the additional cooler geometry. It is possible to remove the effect of the additional cooler but the procedure depends on the pressure in the duct. If relevant frequencies in the signal are similar to the natural frequency of the cooler, a simple filtering technique is not recommended. In this case, direct application of the acoustic theory inside ducts allows the reconstruction of the instantaneous pressure in the duct. Comparisons between the reconstructed pressure and measurements carried out with piezoelectric transducers, which do not capture the absolute value of the signal but can be placed in the duct without using an additional cooler, in hot and pulsating flow are presented. Results confirm that the method for pressure reconstruction from additional cooled piezoresistive transducers provides accurate information for instantaneous pressure measurement in hot and pulsating flow conditions inside ducts.
机译：内燃机的研究任务通常需要对排气歧管内部的气体进行瞬时压力测量，包括绝对值信息。在这样的环境中，流动操作包括高温和极强的脉动条件。本文中描述的工作可确定使用压阻传感器获取绝对压力时出现的问题。提出了一种基于对管道和原始传感器冷却器适配器之间的压阻传感器使用附加冷却器的方法来进行动态压力测量。为了检查额外的冷却器几何形状的影响，已经在冷和热脉动流中进行了特定测试。可以消除附加冷却器的影响，但是过程取决于管道中的压力。如果信号中的相关频率与冷却器的固有频率相似，则不建议使用简单的滤波技术。在这种情况下，在管道内部直接应用声学理论可以重建管道中的瞬时压力。提出了重构压力与压电换能器之间的比较，压电换能器无法捕获信号的绝对值，但可以在不使用附加冷却器的情况下将其放置在管道中，从而产生热的和脉动的流量。结果证实，通过额外的冷却压阻传感器重建压力的方法可为管道内高温和脉动流动条件下的瞬时压力测量提供准确的信息。

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