The method of determining the boundaries of vibration of the combustion of the combustion chamber and a device for its implementation

 

The invention relates to the field of creation of combustion power plants mainly for aircraft engine aircraft, and in particular to methods of determining the boundaries of the vibration of the main combustion chamber of a combustion turbine engine, the combustion chamber, for example a gas turbine drive supercharger main gas (aircraft type) at compressor stations gas pipelines. The objective of the invention is the expansion of the field of checking the stability of the workflow, reducing costs and time when the boundaries of the vibration of the combustion in the combustion chamber. This task is achieved by the fact that the output of the combustion chamber in the operating mode and for each fixed value of fuel alternately changing the relative flow velocity in the chamber by increasing and decreasing the area of the critical section of the nozzle until the regular fluctuations of pressure. The system of control and regulation device for determining the boundaries of vibration of the combustion in the combustion chamber. 2 S. and 2 C.p. f-crystals, 3 ill.

The invention belonged to the area of combustion power plants, mainly for aviation turbojet engine, the device of the combustion chamber, for example a gas turbine drive supercharger main gas (aircraft type) at compressor stations gas pipelines.

There is a method of defining the boundary of the vibration of the combustion in the combustion chamber of an oxygen-hydrogen rocket engine method of reducing the temperature of the injected liquid hydrogen to the occurrence of high-frequency instability (1).

A method of decreasing the temperature of hydrogen (CTV) has been successfully applied in the assessment of the sustainability of the nozzle head large LRE J-2 and the selection of the final highly experimental combustor.

However, in this way it is possible to define the boundary of the vibration combustion only in a very narrow range of variation of parameters - the ratio of components and the pressure in the combustion chamber.

There is also known a method of determining the boundaries of vibration of the combustion model the combustion chamber and the device in which it was served homogeneous, benthofauna the mixture is heated to C, and the combustion products were expired from the unregulated nozzle nozzle with subcritical speed and to determine the boundaries of vibration of combustion produced by changing the fuel / air mixture while constantly is but to define the boundary of the vibration combustion in a relatively narrow range of variation of the parameters of the model combustor at high economic cost, because a large number of time-consuming experiments when determining the boundaries of vibration of burning.

The objective of the invention is the expansion of the field of checking the stability of the workflow, reducing costs and time when the boundaries of the vibration of the combustion in the combustion chamber.

This task is achieved by a method for determining the boundaries of vibration of the combustion chamber of combustion, including flow measurement of air and fuel, check pressure fluctuations in the combustion chamber and camera settings when the regular occurrence of pressure fluctuations by measuring the fuel / air mixture at a fixed air flow, produce a step change in fuel consumption and at each fixed value of fuel consumption, altering the relative speed of the flow in the chamber by increasing and decreasing the area of the critical section of the nozzle until the regular pressure fluctuations.

This task is achieved by the fact that at the exit of the combustion chamber to define the boundaries of vibration of combustion containing the air supply system and fuel system check the camera settings and pressure fluctuations, the system is installed for the variation relative to the stem for varying the relative flow velocity is made in the form of an adjustable nozzle with hydraulic actuator, United pipe with electrohydrodynamic regulator-Converter attached to the housing, the control line regulator installed butterfly valve, kinematically associated with it, and its control elements are connected electrically via the control unit with sensor check pressure fluctuations in the combustion chamber and electric lines bypass the fuel inlet of the fuel pump in the supply line of the fuel in the combustion chamber has a throttle valve control fuel consumption, kinematically associated with electrohydrodynamic regulator-Converter. In addition, the adjustable nozzle may be made in the form of the subsonic part of the Laval nozzle.

Implementing a step change in fuel consumption and at each fixed value of fuel consumption by changing the relative flow velocity in the chamber until the regular fluctuations of pressure, we can determine the boundaries of the vibration of the combustion of the combustion chamber in the wider area check the stability of the workflow while reducing costs and time to experiment.

Selecting the design of the system for varying the relative flow velocity in the chamber in the form of re is namechecked regulator-Converter, attached to the case where the control line regulator installed butterfly valve, kinematically associated with it, and its control elements are connected electrically via the control unit with sensor check pressure fluctuations in the combustion chamber and electric lines bypass the fuel inlet of the fuel pump in the supply line of the fuel in the combustion chamber has a throttle valve control fuel consumption, kinematically associated with electrohydrodynamic regulator-Converter, we are able to manage two throttle valves of the fuel in the combustion chamber, and an adjustable nozzle through the control unit, working on the program, we have an opportunity with high reliability and minimal cost of time and resources to perform experiments to determine the boundaries of vibration of burning.

Running the adjustable nozzle in the form of the subsonic part of the Laval nozzle turbojet engine with hydraulic power drive, we have the opportunity to significantly reduce costs and reduce time to create a setup to define the boundaries of the vibration of the combustion of the combustion chamber, thus eliminating the need for a manufacturer and tedious task.

In General, it provides an objective of this invention is to extend the scope of checking the stability of the workflow, reducing costs and time when the boundaries of the vibration of the combustion in the combustion chamber.

In the drawings shows a device for determining the boundaries of vibration of the combustion of the combustion chamber and a graph illustrating the position of the boundary of stable operation of the combustor.

In Fig. 1 shows a General view of the device, with a longitudinal section of the combustion chamber, implements the method of determining the boundaries of vibration of burning.

In Fig.2 - sustainable and vibration combustion of the combustion chamber in the coordinates of the relative air velocity in the diffuser at the entrance to the combustion chamber, the air excess factor.

In Fig.3 shows a variant of an adjustable nozzle.

The device comprises a diffuser of the combustion chamber 1, a pipe 2 for supplying fuel into the combustion chamber, the pipe 2 provided with a throttle valve 3 control fuel consumption, kinematically connected through levers 4 electrohydrodynamic regulator-Converter 5, fixed to the body 6. The combustion chamber 7 has the flame tube 6, is equipped with sensors measuring parameters 9 and pullover actuator 12 with adjustable mechanical stops in the cylinders maximum and minimum diameter of the critical section, the provisions of the valves adjustable nozzle 11, connected by pipes 13 fuel supply to the actuator 12 through the throttle valve 14 of the fuel management, kinematically associated levers 15 with electrohydrodynamic regulator-Converter 5, and its control elements 16 through the control unit 17 is connected by electrical wires 18, 19 with sensors recording pressure variations 10 in the combustion chamber 7 and the actuator 20 line bypass fuel 21 of the intake of the pump 22.

The method of determining the boundaries of vibration of the combustion of the combustor implemented as follows.

Start the air supply system and fuel in the combustion chamber include registration system parameters and pressure fluctuations in the combustion chamber, includes a system for varying the relative flow velocity at the exit of the combustion chamber, ignites the combustion chamber 7, go to the operating mode and at a constant air flow to produce a step change of the fuel in the combustion chamber 7, by changing the position of the throttle valve 3, and at each step for xed values of fuel consumption alternately change the relative velocity of the flow in the diffuser 1 of the combustion chamber 7 by increasing and decreasing the area of the critical section of the nozzle 11 to pawtuckaway part 23 full-Laval nozzle 24 turbojet engine with a hydraulic actuator.

Sources of information 1. "Combustion instability in rocket engine" Ed. by D. T. Harrje and F., Ritona. Ed. Mir, Moscow, 1975, S. 806, 807, Fig.10.45, 10.46.

2. KN. "Applied mathematics and theoretical physics", 1, l967 "About the two modes model of the combustion chamber as thermoacoustic self-oscillatory systems" V. E. Doroshenko and others, Moscow, S. 64 of Fig.1, S. 68 of Fig.4.

Claims

1. The method of determining the boundaries of vibration of the combustion chamber of combustion, including flow measurement of air and fuel, check pressure fluctuations in the combustion chamber and camera settings when the regular occurrence of pressure fluctuations by changing the fuel / air mixture at a fixed air flow, characterized in that produce a step change in fuel consumption and at each fixed value of fuel consumption, altering the relative speed of the flow in the chamber until the regular pressure fluctuations.

2. The combustion chamber to define the boundaries of vibration of combustion containing the air supply system and fuel system check the camera settings and pressure fluctuations, characterized in that the output from the camera system installed for variation otnositel the different topics the system for varying the relative flow velocity in the chamber is in the form of an adjustable nozzle with a hydraulic actuator connected to pipelines with electrohydrodynamic regulator-Converter attached to the housing, the control line regulator installed butterfly valve, kinematically associated with it, and its control elements are connected electrically via the control unit with sensor check pressure fluctuations in the combustion chamber and electric lines bypass the fuel inlet of the fuel pump in the supply line of the fuel in the combustion chamber has a throttle valve control fuel consumption, kinematically associated with electrohydrodynamic regulator-Converter.

4. The combustion chamber to define the boundaries of vibration combustion under item 2 or 3, characterized in that the adjustable nozzle is made in the form of the subsonic part of the Laval nozzle.

 

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