SU1286834A1 - Method of determining carrying capacity of pneumatic resistor - Google Patents

Abstract

Invention m. used in determining the throughput of various pneumatic units by purging using model working fluids (MRI). The invention makes it possible to increase the determination accuracy by modeling the thickness of the boundary layer. The MRI with the known adiabatic index 4 is fed to the supply line 1 and additionally immediately before the pneumatic resistance 3. In this case, the magnitude of the additional flow rate of the MRI is dependent on the difference between the adiabatic indicators of the working fluid and the MRI , pressure and flow rate at the entrance to the pneumatic resistance 3 and determine the value of the flow capacity according to f-le. As a working medium, m. superheated steam was used, and as MRI - freon-22, argues, air. 1 il. (L

Description

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The invention relates to power engineering and can be used in determining the throughput of various pneumatic units by blowing them using model working media instead of working media on which they are operated.

The aim of the invention is to improve the accuracy of determining the throughput of pneumatic resistances.

The invention is illustrated in a schematic diagram of the section of the stand on which this method is implemented.

The booth section contains an input line I, a flow meter 2, a pneumatic resistance 3 under test, an additional line 4 for supplying or discharging a model working fluid, a flow meter 5 and an output line 6. The working fluid is superheated steam, and air as a model working fluid argon or freon-22.

The method is implemented as follows.

. A model working fluid through an input line through the flow meter device 2 enters a pneumatic resistance 3 under test. Via an additional line 4, a model working body is supplied to or removed from the flow meter device 5. At the same time, the value of the additional consumption of the model working fluid is depending on the difference in the adiabat Ak of the working body and the model working fluid. The purge process measures the temperature, pressure and flow rate at the inlet to the pneumatic resistance 3. After the pneumatic conjugation test 3, the model working body enters the output line 6.

The value of the pneumatic impedance 4 is determined from the expression:

fF

R

Mkt

where m is the flow rate of the working body, kg / s;

RVH temperature and pressure of the working fluid at the inlet, K and MPa;

A (k) 4 k (1-,

O

five

0

five

0

five

0

five

k is the adiabatic index of the worker

body.

Superheated steam is used as the working fluid, and freon-22, argon, and air are used as the model working fluid. At the same time, by simulating the flow conditions through the pneumatic resistance, in particular the thickness of the resulting boundary layer, the accuracy of the measurement of the throughput of the pneumatic resistance is increased.

F o rm u la invention

The method of determining the throughput of the pneumatic resistance, which consists in blowing it with a model working fluid with a known adiabatic index value, feeding it into the supply line, and measuring the temperature, pressure and flow rate of the model body at the inlet to the pneumatic resistance the ability of pneumatic resistance on the working body, that is, in order to increase accuracy, an additional slave model is supplied to the supply line just before pneumatic resistance Outer body, whose relative consumption value is determined by dependence

T | s L / .LN

-

Where

+ b (Ak)

) n is the magnitude of the main flow rate of the working fluid passing through the resistance, kg / s; additional value

consumption of model working fluid, kg / s;

dK is the difference between the adiabatic indices of the working body and the model working body; a and b - coefficients of proportionality:

a 0.074-0.084; (0.10-0.01).

Claims (1)

Claim A method for determining the throughput 'of pneumatic resistance, which consists in blowing it with a model working fluid with a known value of the adiabatic index, feeding it to the supply line, measuring the temperature, pressure and flow rate of the model body at the inlet of the pneumatic resistance and judging the throughput pneumatic resistance on the working fluid, characterized in that, in order to increase accuracy, an additional working fluid is additionally fed into the supply line immediately before the pneumatic resistance, the value of the relative flow rate of which is determined by the dependence • 5 ~ = alk + b (dk) ² , where hi is the value of the main flow rate * of the working fluid passing through the resistance, kg / s; the value of the additional flow rate of the model working fluid, kg / s; dk is the difference between the adiabatic parameters of the working fluid and the model working fluid; a and b are the proportionality coefficients: a = 0.074-0.084; B = - (0,100,01). VNIIIPI Order 7699/36 Circulation 638 Subscription Custom polygr. pr-tie, Uzhhorod <st. Project, 4