FLOW TRANSDUCERS METROLOGICAL PERFORMANCES OPTIMIZATION WITH FLOW BODIES AT FLOW ASYMMETRY CONDITIONS

Abstract

The absence of computer-aided design systems with the choice of flow transducers (FT) for energy resource supply systems determines the relevance criteria developing for evaluating flow transducers effectiveness for liquids and gases. It is advisable to carry out FT optimization with flow bodies by determining rational forms and parameters of hydraulic channel and sensitive element (SE). The FT accuracy can be estimated depending on its purpose, operating conditions and the nature of the measured medium movement: from a probabilistic accuracy index, by the dynamic error index and the generalized efficiency criterion. The last criterion is based on the criteria for the interaction effectiveness of the measured medium flow with the transducer SE and ensures high sensitivity of the system and measurement accuracy with minimal impact on the parameters of the measured medium. The article presents the results of the evaluation of the flow asymmetry influence induced by the spatial knee on the operation of transducers with sensitive elements of various spatial forms. The measurement means with a cone-type flowed body directed apex towards the flow are the best under the conditions of minimum error and minimal effect on the measured medium. The obtained results make it possible to clearly determine the instrument installation place in the technological network under conditions of maximum accuracy and minimal impact on the measured medium.