SU1303943A1 - Transducer of kinetic energy head of gas flow - Google Patents

Abstract

The invention relates to a measurement technique and reduces the measurement error by eliminating the effect of radial flow irregularity. The sensing cylindrical transducer rod 1, with its single end, is rigidly connected to the beam 2 located perpendicular to it. Under the action of the velocity head, bending and torques arise in the root section of the beam, creating in it bending stresses perceived by strain gauges 3-6. Placing one pair of strain gauges 3, 5 along the axis of the beam 2, and pairs 4, 6 perpendicular to it, caused the independence of the output signal of the stress sensors, proportional to the applied bending moment, on the magnitude of the torque and on the displacement of the total force applied when the radial flow irregularities. 3 il. | (L so o oe, .r oo Fig.Z

Description

The invention relates to a measuring, fielding technique and can be used to measure the velocity head of a gas stream of aircraft engines.

The purpose of the invention is to reduce the error by eliminating the effect of radial flow irregularity.

Figure 1 shows the proposed converter, a general view; Fig, 2 is the same, top view; on fig.Z - the same, side view.

The transducer contains a cylindrical rod 1, mounted on a beam 2, in the root section of which strain gages 3-6 are installed. The converter is installed in the engine channel 7.

The Converter operates as follows.

Under the action of the flow velocity head, the cylindrical rod 1 perceives the total amount Pj., With this due to the fact that beam 2 is perpendicular to the direction of flow, a bending M and a torque M act in its root section, equal to

M P b;

M P, a, k 1

where b is the length of the beam 2;

a is the distance from the center of application of the total force to the beam axis.

Sensors connected in a bridge circuit perceive the stresses acting on them, depending on the direction of their action, equal to

Gg C-g COSOt,

where n voltage in sensors :,

gp is the voltage in beam 2; o angle between direction

the stresses in the beam and the direction of the sensitivity of the sensor. The output signal of the sensors is proportional to the applied bending moment and does not depend on the magnitude of the torque.

When changing the place of application of the total force P from the change for the sake of

In terms of the flux irregularity, the bending moment in beam 2 remains constant due to the invariance of the size (b) only the distance (a) changes and, therefore, the torque value on which the output signal does not depend.

Claims (1)

Invention Formula The transducer of the velocity head of the gas flow, containing perceiving a cylindrical rod and strain gauges placed in the housing, characterized in that, in order to reduce the error by eliminating the effect of the radial unequal flow dimension, a beam fixed at one end in the housing and the other rigidly connected to the end of a cylindrical rod located perpendicular to it, and strain gauges placed at the root of the beam, with one pair load cells are along the beam axis, and the other is perpendicular to it. . -four 1 Editor A.Revin Compiled by V.Novichkov Tehred I.Popovich Order 1303/45 Circulation 777 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG. 2 Proofreader L. Natay