Correcting frequency characteristics of pressure pulsations probes (review)

Correcting frequency characteristics of pressure pulsations probes (review)

Аннотация

Unsteady pressures are considered as one of the main parameters in the final design of gas turbine engines and also in other power plants. In this scientific paper special focus lies in the accuracy of the unsteady pressure measurements. The gas flow with high temperature and the restrictions on the sensor mounting place dimensions often do not allow the sensor to be mounted directly at the pressure measuring point. Therefore, it is necessary to connect the sensor to the process using a pressure transmission line. It’s a well known fact that the resonance frequencies occur’s in the pressure transmission line systems, and it leads to an additional dynamic error into unsteady pressure measurement. To correct the unsteady pressure during experiments, in-line compensation elements in the pressure transmission line system are used. Devices consisting of a dynamic pressure sensor, a pressure transmission line, and a correcting element in the technical literature have been introduced and its called as called the pressure pulsation probe. Considering the importance of the constant growth of the modern engine thrust and, correspondingly, the working process temperature increase, the authors are interested to carry out an overview analysis of effectiveness of the correcting elements based on available patents, articles and monographs.
This paper deals with acoustic correcting elements with distributed and lumped parameters, their advantages and disadvantages are explained, and also presented the methods for calculating the frequency characteristics of probes and their application in the processing of experimental data. The analysis is carried out without considering the error of the pressure pulsation sensor itself. The article will be of interest to developers of pressure pulsation probes used in the extreme conditions of their operation, engineers and technicians for GTE testing and improving.

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