SU964481A2

SU964481A2 - Gas flow temperature device

Info

Publication number: SU964481A2
Application number: SU803214886A
Authority: SU
Inventors: Владимир Михайлович Удовенко
Original assignee: Рижское высшее военное авиационное инженерное училище им.Якова Алксниса
Priority date: 1980-12-08
Filing date: 1980-12-08
Publication date: 1982-10-07

Description

(5) УСТРОЙСТВО ДЛЯ ИЗМЕРЕНИЯ ТЕМПЕРАТУРЫ ГАЗОВОГО ПОТОКА(5) DEVICE FOR MEASURING THE GAS FLOW TEMPERATURE

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Изобретейие относитс к термомет рии и может быть использовано при измерении температуры воздуха или газов газотурбинных двигателей.The invention relates to thermometry and can be used to measure the temperature of air or gases of gas turbine engines.

По основному авт. СЁ. № 8879 3 известно устройство дл измерени температуры газового потока, содержащее т.ермодатчик с ; усилителем, выход которого подключен к входу сумматора , через дифференцирующий блок- ю к входу блока перемножени и через первый фильтр-преобразователь - к входу вычислител , датчик давлени с усилителем, соединенный через второй фильтр-преобразователь с вторым ts входом вычислител , выход которого подключен к второму входу блока перемножени , соединенного свторым входом сумматора Р According to the main author. Here. No. 8879 3, a device is known for measuring the temperature of a gas stream comprising a temperature sensor with; the amplifier, whose output is connected to the input of the adder, through a differentiation unit to the input of the multiplication unit and through the first filter converter to the input of the calculator, a pressure sensor with an amplifier connected through a second filter converter to the second ts input of the calculator, the output of which is connected to the second input of the multiplication unit connected to the second input of the adder P

Однако это устройство имеет погрешность , обусловленную отсутствием коррекции по посто нной времени датчика дав ени .However, this device has an error due to the lack of correction for the constant time of the pressure sensor.

Целью изобретени вл етс повышение точности измерени .The aim of the invention is to improve the measurement accuracy.

Поставленна цель достигаетс тем, что в устройство дл измерени температуры газового потока дополнительно введены соединенные последовательно дифференцирующий блок, блок умножени и сумматор, а также задатчик посто нной времени, выход которого соединен с одним из входов дополнительного блока умножени , причем выход датчика давлени с усилителем соединен с входом дополнительного дифференцирующего блока и с вторым входом дополнительного сумматора , а выход последнего соединен с входом второго фильтра-преобразовател .The goal is achieved by adding a series-connected differentiation unit, a multiplication unit and an adder, as well as a constant time setting device, the output of which is connected to one of the inputs of the additional multiplication unit, to the device for measuring the temperature of the gas flow; with the input of the additional differentiating unit and with the second input of the additional adder, and the output of the latter is connected to the input of the second filter converter.

На чертеже приведена блок-схема предлагаемого устройства.The drawing shows a block diagram of the proposed device.

Claims

The device contains a thermal sensor 1 with an amplifier, a pressure sensor 2 with an amplifier, differentiating blocks 3 and i, blocks 5 and 6 multiplication, adders 7 and 8, filter converters 9 and 10, calculator 11, constant-time setting device 12. A thermal sensor t with an amplifier is connected to the first input of the adder 7, through the differentiating unit 3 to the first input of the multiplication unit 5 and through the first filter converter 9 to the first input of the calculator 11. Pressure sensor 2 with the amplifier is connected in series through the differentiations of unit 3 and unit 5 multiply to the first input of the adder 8, the second input of which is connected to the output of the sensor 2, and the output through the filter converter 10 to the second input of the calculator 11. The constant-time adjuster is connected to the mountain input of the interchange unit 6. When the parameters of the gas flow change with time, the temperature is measured by the thermal sensor 1, and the working fluid is measured by the sensor

2. The measured pressure signal of the working medium enters the adder 8, where it is summed with the signal derived from this pressure, obtained in differentiating unit k. This signal is multiplied in block 6 by the value of the time value of the pressure sensor, which comes from setpoint 12. Signals from adder 8 and temperature sensor 1, respectively, through filters-n images of atomizers 10 and 9 are sent to the calculator P. The time constant of the temperature sensor, the factor "1" on which in block 5 is multiplied by the derivative signal of the output signal of temperature sensor 1, obtained in the differential unit

3. At the output of the adder 7, the gas flow temperature signal is formed by summing the signal from the temperature sensor 1 with the signal received in the smart-5 unit. The calculation of the time constant of the thermal sensor is carried out as follows. Pressure and temperature in one section of a gas turbine engine from I men 1ртс simultaneously. In this case, the time constant of the pressure sensor is in order of magnitude less than the time constant of the temperature sensor. In addition, unlike the last time constant, the pressure sensor is independent of the change in gas flow parameters. Therefore, the signal of the pressure of the working fluid 9 from the output of the adder is input, and the measured temperature of the thermal sensor 1 is the output parameters characterizing the dynamic properties of the thermal sensor 1. In the inertia correction circuit of the pressure sensor, which includes the differentiating unit 4, multiplication unit 6, setpoint 12 constant time and the adder 8, a signal is generated corresponding to the input pressure. The filter converters 9 and 10 are a chain of inertial links and have a transfer function of the form FCP) -, V CTRI) where p is the differentiation operator; T is the constant of the inertia eremen; cc is the number of inertial links in the filter. Linear combinations of signals at the outputs of filter converters 9 and 10 produce signals associated with the dynamic parameters of the identified thermal sensor 1 by the relationship -lL4 - i bolUp (i) (1) where - indicates that the function contained in them is filtered d times filter with transfer function dp + ir; the time constant of the temperature sensor; voltage taken from amplifier thermal sensor 1; time; Up transfer ratio; Up (t) is the voltage taken from the output of the adder 8 and proportional to the pressure of the gas stream. The expression t1) is a linear algebraic equation for the unknown parameters TQJH bo. The sought parameter TQ, on the basis of recurrence relations, is determined by the calculator 11. The study found that using the proposed device for measuring the gas flow temperature reduces the error in determining the time constant of the temperature sensor, and hence the dynamic error of measuring the gas flow temperature compared to known device to 2.5-9.5. The invention The device for measuring the temperature of the gas stream by the author. St. No, characterized in that, in order to improve the measurement accuracy, a successively connected differentiating unit, multiplication unit and adder, as well as a fixed time setting device, the output of which is connected to one of the inputs of the additional multiplication unit, are additionally introduced into the device; the pressure with the amplifier is connected to the input of the additional differentiating unit and to the second input of the additional adder, and the output of the latter is connected to the input of the second filter converter. Sources of information taken into account in the examination 1. USSR author's certificate number 8879 «3, cl. G 01 K // And, I8.0,8f (prototype).

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