SU684351A1

SU684351A1 - Pressure ration pickup

Info

Publication number: SU684351A1
Application number: SU772510397A
Authority: SU
Inventors: Игорь Иванович Власов; Людмила Ивановна Дербенева
Original assignee: Казанский Ордена Трудового Красного Знамени Авиационный Институт Им.А.Н.Туполева
Priority date: 1977-07-25
Filing date: 1977-07-25
Publication date: 1979-09-05

Description

1one

Изобретение относитс к области приборостроени и может найти применение в системах управлени газотурбинными двигател ми (ГТД), например в системах регулировани .статического режима по степени повышени давлени в компрессоре, ограничител х степени повьшени давлени в компрессоре, автоматах разгон ГТД по комплексу параметров, регул торах форсажных камер турбореактивных двигателей по степени расширени газов в турбине,а также в системах регулировани и управлени воздухозаборником и геометрией компрессораThe invention relates to the field of instrumentation and can be used in gas turbine engine control systems (GTEs), for example, static mode control systems according to the degree of pressure increase in a compressor, pressure limiters in a compressor, automatic overclocking GTE according to a set of parameters, regulators afterburner chambers of turbojet engines according to the degree of expansion of gases in the turbine, as well as in the systems of regulation and control of the air intake and compressor geometry

Известны пневматические датчики отношени давлени (1.Pneumatic pressure ratio sensors are known (1.

Наиболее близким по технической сущности к предлагаемому датчику вл етс датчик отношени давлени газа, содержащий сопло питани , вход которого соединен с источником высокого давлени , а выход - с камерой взаимодействи , соединенной с источником низкого давлени , и цилиндрический приемник полного давлени с отверсти ми у закрытого его торца, расположенный против сопла питани .The closest in technical essence to the proposed sensor is a gas pressure ratio sensor comprising a power nozzle, the inlet of which is connected to a high pressure source, and the outlet to an interaction chamber connected to a low pressure source and a cylindrical total pressure receiver with openings at the closed its end face, located against the feed nozzle.

Датчик отношени давлени снабжен струйно-акустическим преобразователем температуры газа, сопло питани которого соединено с источником высокого давлени , частотным смесителем и фильтром, а на внутренней поверхности приемника полного давлени установлен частотный преобразователь .The pressure ratio sensor is equipped with a jet-acoustic gas temperature transducer, the supply nozzle of which is connected to a high pressure source, a frequency mixer and a filter, and a frequency transducer is installed on the inner surface of the full pressure receiver.

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Выходным сигналом датчика вл етс результирующий сигнал с частотой, равной разности частот автоколебаний в струйно-акустическом преобразователе температуры и автоколебаний в 5 приемнике полного давлени 2.The output signal of the sensor is the resultant signal with a frequency equal to the difference between the frequencies of self-oscillations in the jet-acoustic temperature transducer and self-oscillations in 5 receiver full pressure 2.

Такой датчик позвол ет формировать электрические выходные сигналы, что ограничивает область применени его в системах управлени , например Such a sensor makes it possible to generate electrical output signals, which limits its scope in control systems, for example

0 в гидромеханической системе управлени ГТД, где желательно иметь выходной сигнал датчика в форме механического перемещени .0 in the hydromechanical control system of the CCD, where it is desirable to have a sensor output signal in the form of a mechanical displacement.

Целью изобретени вл етс расши5 рение области применени датчика отношени давлений.The aim of the invention is to expand the field of application of the pressure ratio sensor.

Claims

This is achieved by the fact that the proposed pressure ratio sensor, comprising a power nozzle, an input is co-triple connected to a high pressure source, and an exit to an interaction chamber connected to a low pressure source, and a cylindrical total pressure receiver J with openings at its closed end. located opposite the feed nozzle, provided with a piston with a rod, located in a pneumatic cylinder, the piston cavity of which is connected to a source of HIGH pressure through the dross. a separate divider, and the cavity under the piston communicates with the internal cavity of the full pressure receiver, while the piston is rigidly connected to the closed end of the full pressure receiver. Corrected high pressure is applied to the cavity above the piston (correction by dividing by a constant number, performed in a divider consisting of two nozzles), pressure equal to the recovered pressure in the full pressure receiver is supplied to the cavity under the piston, the internal cavity of the receiver is full of pressure Io through holes at the end of the receiver. The principle of the device is based on comparing the piston of the pneumatic cylinder to the values of pressures: the corrected high pressure and the restored pressure in the receiver of the total pressure, which depends on the Mach number (M) of the jet per section of the supply nozzle and on the distance between the section of the supply nozzle and the end of the receiver ( as M increases and the distance increases, the loss of total pressure increases, the pressure recovery ratio decreases, and the number M at the feed nozzle section uniquely depends on the ratio of input pressures). At a constant value of the ratio of pressures and the number M, the piston is in a position corresponding to the equality of the forces acting on the piston. When the pressure ratio changes, for example, an increase, the number M of the jet emanating from the power nozzle increases, and the pressure recovery ratio decreases, the piston moves under the effect of the pressure difference, the distance between the power nozzle section and the end of the receiver decreases. the inlet to the receiver is also reduced, which leads to an increase in recovered pressure. When equality of the forces acting on the piston is achieved, the movement of the piston is stopped. The magnitude of the piston movement is determined by the ratio of the input values, and the movement of the rod connected to the piston of the pneumatic cylinder is the output of the pressure ratio sensor. 14 Receiving the output signal due to the mechanical movement of the rod provides, in comparison with the prototype, the possibility of directly connecting the pressure ratio sensor with the hydromechanical control system of the engine. The drawing shows a pressure ratio sensor circuit. The pressure ratio sensor consists of a pneumatic cylinder 1 with a piston 2 coaxially installed in the chamber 3 of the power nozzles 4 and a total pressure receiver 5 commensurate with it (O, 8-1, 5, where d, is the internal diameter of the full pressure receiver 5, d. - diameter of the outlet nozzle of the power supply 4), made in the form of a cylinder with holes 6 at its closed end, and connected to the piston

2. The chamber 3 through the openings 7 communicates with a low pressure source, for example, with an air inlet to the compressor. The piston 2 is connected to the rod 8, which is withdrawn from the pneumatic cylinder 1 through a seal, in the cavity 9 of the pneumatic cylinder 1 a pressure equal to high pressure multiplied by the divider division ratio consisting of two nozzles 10 and 11 is maintained. The pressure ratio sensor works as follows. With a constant value of the ratio of the input pressure and the number M of the jet, which bounces from the nozzle 4, for example, with a constant degree of pressure increase in the compressor, the piston 2 is in a position corresponding to the equality of the forces acting on it. When the pressure ratio changes, for example, as the pressure increases, the M number of the jet increases, the pressure recovery ratio decreases, the piston 2 moves down, the distance between the power supply nozzle 4 and the end of the full pressure receiver decreases, and the pressure in the receiver 5 begins to increase. When the forces acting on the piston 2 are equal, the pressure of the piston 2 stops. The movement of the rod 8 connected to the piston 2 determines the ratio of input pressures. Claims of the pressure ratio sensor comprising a supply nozzle whose inlet is connected to a high pressure source and an outlet to an interaction chamber connected to a low pressure source and a cylindrical total pressure receiver with openings at its rear end, characterized in that, in order to expand the field of application, it is provided with a piston with a rod placed in a pneumatic cylinder, the piston cavity of which is connected to a high pressure source through a throttle The cavity and the cavity under the nopuiH & n are connected to the internal floor of the 11-ohl pressure receiver, while the piston is rigidly connected to the closed end of the full-pressure receiver. 16 Sources of information taken into account in the examination 1. Zalmanzon LA Aerohydrodynamic methods for measuring the input parameters of automatic systems. M., 1973, p. 20-23. 2, USSR Author's Certificate 588478, cl. G 01 L 15/00, 1976.