SU1033954A1 - Gas flow parameter determination method - Google Patents

Abstract

A METHOD FOR DETERMINING THE PARAMETERS OF A GAS FLOW, which consists in creating a volumetric supersonic disturbance, measuring the speed of propagation of this disturbance and determining the parameters of the gas flow with it in order to expand the scope by increasing the number of measurements parameters, additionally simultaneously with the main one, do not create the manner of two volumetric supersonic disturbances in the gas flow area under study, determine the propagation velocity, the intensity of these disturbances taking into account the parameters of the gas flow.

Description

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four . 1 The invention relates to an instrumentation technique and can be used to determine the parameters of a gas stream. A method used in aerodynamic supersonic tubes is known, which consists in introducing small perturbations into the stream at ;. using thin needles or probes, observe the lines of perturbation and determine the Mach number in the pipe 1 from the angles of inclination to the direction of the unperturbed flow. The disadvantages of this method are the low information content (only the Mach number is determined) and the possibility of using it only for monitoring parameters and supersonic flows. The closest to the invention in its technical nature is a method for determining the parameters of a gas stream, which consists in creating a volumetric supersonic disturbance, measuring the velocity of propagation of this disturbance, and determining the parameters of gas flow 2 using this method. The disadvantage of this method is narrow field of application due to the limited number of simultaneously measured parameters and the possibility of using it only for studying uniform flows. The purpose of the invention is to expand the field of application by increasing the number of measured parameters. This goal is achieved by the fact that according to the method of determining the parameters of a gas stream, which consists in creating a volumetric supersonic disturbance in it, measuring the velocity of propagation of this disturbance and determining the parameters of the gas flow along with the main one. perturbations in the studied area of the gas flow, determine the speed of propagation, the intensity of these opportunities, taking into account which determine the parameters of the gas flow. The drawing shows a region in the gas stream within which the parameters of the gaseous medium are considered constant. The drawing shows schematically supersonic disturbances T, n, J. approached the boundary of this area; 5 Vf Vg, V, i, Mj, Mm are their velocities and Mach numbers (intensity of intensity j, respectively; V is the gas velocity vector; U and V are the corresponding components of the gas velocity vector, determined in the direction of the propagation of disturbances I and III, respectively / 5 - the angle between the direction of propagation of the 1st and -th perturbation fronts, 1st and fjth fronts are parallel.It is known that the parameters of a supersonic perturbation propagating through gas depend not only on the source that excites this perturbation as well as on the state and properties of gaseous media This disturbance propagates. One disturbance is sufficient to determine the flow velocity and the speed of sound in the flow, but it must be uniform and stationary and its direction of movement must be known in advance. An introduction to the flow of an additional two disturbances allows These limitations and increase the number of measured parameters. Introducing several disturbances into the flow simultaneously, determining their propagation velocity and intensity, allows increasing the number of measured napaMetpoB. The possibility of increasing the number of measured parameters is due to the fact that, when an additional two disturbances are introduced into the flow, additional information appears on the propagation of disturbances of a different intensity and another direction in the test flow, which makes it possible to compose a system of equations for determining the desired parameters. equations, allowing to determine the gas velocity - V, the direction of gas movement, the sound velocity of the gas - and Vj i-ii ot vt V yu + V 42UVco5 / 5

Claims (1)

A METHOD FOR DETERMINING GAS FLOW PARAMETERS, which consists in creating a supersonic volumetric perturbation in it, measuring the propagation velocity of this perturbation and determining the gas flow parameters from it, which differs in that, in order to expand the scope by increasing the number of measured parameters additionally, simultaneously with the main one, they create at least two volumetric supersonic disturbances in the studied gas flow region, determine the propagation velocity, the intensity of these disturbances, taking into account determining parameters of the gas stream. 1033954 2