SU1046627A1 - Method of measuring temperature of gas in gas liquid flow - Google Patents

Abstract

THE METHOD OF MEASURING THE GAS TEMPERATURE IN THE GAS-LIQUID STREAM PUSH-. By introducing into the measured flow of the probe with a temperature sensor and suction of the surface layer, the gas-liquid flow flowing onto the probe, оt, -. characterized by the fact that, with c-; In order to increase the accuracy due to the depoweration of complete separation of the liquid phase from the gas phase, the flow rate of the aspirated surface layer of the gas-liquid flow incident on the probe is controlled to establish the maximum value of the temperature, and this temperature is measured downstream of the probe. (L o: o to

Description

The invention relates to thermometry and can be used to measure gas temperature in a two-phase gas-liquid? L flow that occurs in the combustion chamber, gas generators, jet nozzles.

A known method for determining the temperature 'of gas in a gas-liquid stream, based on immersion in a measuring stream of a thermocouple, equipped with a protective heat shield, ... heating the thermocouple. to a temperature equal to the temperature of the film boiling liquid. of the phase of the flow, subsequent removal of the screen, measuring the thermo-emf of the thermocouple in the steady-state thermal regime and the contact time of the thermocouple with the gas and liquid phases of the flow, and determining the temperature from the multifunctional empirical dependence, and [1 / J.

However, for the implementation of this method ¹ , complex technological operations and calculation of the gas temperature by a multifunctional empirical dependence are necessary.

The closest in technical essence and the achieved result to the invention is a method for measuring the temperature of a gas in a gas-liquid stream by introducing into the measured stream a probe with a temperature sensor and suctioning the wall layer of the gas-liquid stream incident on the probe, the sensing element being installed in the cavity of the static tube in the suction stream C2J;

I ... ...

In a known method is measured. the temperature of the suction stream, which does not reflect the true tempera-! gas in a gas-liquid stream. The aim of the invention is to increase accuracy by ensuring complete separation of the liquid phase from the gas.

To achieve the goal ', according to the method of measuring the temperature of a gas in a gas-liquid stream by introducing a probe with a temperature sensor into the measured stream and aspirating the near-wall layer of the gas-liquid flow incident on the probe, the flow rate of the suction near-wall layer of the gas-liquid flow incident on the probe is adjusted to establish the maximum value, temperature, and measure this temperature downstream of the probe.

In the drawing, there is a diagram of a device for implementing the proposed method.

The device consists of. probe 1, which contains the end 2, gas duct 3. The suction of the parietal layer, limited by a conditionally dividing current line A, is carried out through holes 4. The suction flow is controlled by a valve 5 mounted on the gas duct 3. The junction of thermocouples is located in the measuring zone B of probe 1.

. The proposed method is carried out as follows.

Probe 1 is introduced into the measured · flow. The suction of the near-wall layer of the oncoming flow, conditionally limited by the current line A, is carried out due to excess pressure in the flow or by a special pump. Suction occurs through openings 4 and gas duct 3. Liquid particles located behind the conditional dividing current line A, due to inertia of movement, fly past the measuring zone & probe 1 “The flow rate of the suction wall layer is controlled by valve 5 until the formation of vapor gas in measuring aeon 5-. 'About education. gas in the measuring zone 5 indicates the maximum unchanged reading of the thermocouple 6, which corresponds to the measured temperature of the vapor gas. When the valve 5 is closed, the suction of the parietal layer ceases, in the measuring zone B there is a gas-liquid flow, the temperature of which can be measured using a thermocouple 6.

In the proposed method, the thermocouple junction is located directly in the studied gas-liquid flow. Using the same thermocouple at the same point, it is possible to measure in succession the temperature of the gas and vapor and the average temperature of the gas-liquid stream.

The suction particles of the liquid do not introduce errors in the measurement of the temperature of the gas, as they do not fall into the measuring zone.

The proposed method is simple to implement and during the measurement process, one parameter is recorded - the thermopower of the thermocouple.

The proposed method allows to increase the accuracy of measuring the temperature of the gas in a gas-liquid stream, this helps to improve temperature control in a number of technological processes.

ВНИИПИ Order 7718/41 Circulation 873 Subscribed

Branch of PPP Patent, Uzhgorod, Project 4,

Claims (1)

METHOD FOR MEASURING TEMPERATURE OF A GAS IN A GAS-LIQUID FLOW By introducing a probe with a temperature sensor into the measured flow and suctioning the wall layer of the gas-liquid flow incident on the probe, about -. characterized in that, in order to increase accuracy by ensuring complete separation of the liquid phase from the gas phase, the flow rate of the aspirated near-wall layer of the gas-liquid flow incident on the probe is adjusted until the maximum value is established. temperature, and measure this temperature downstream of the probe.