KR20030018224A - testing device of injecter for liquid fuel rocket - Google Patents

Abstract

PURPOSE: A liquid rocket injector testing apparatus is provided to precisely analyze a variation of flow rate of a plurality of injectors by feeding compressed nitrogen gas through outputting a feedback signal of a servo control valve based on a variation of pressure supplied into the injector. CONSTITUTION: A liquid rocket injector testing apparatus includes a measuring section(30) for measuring the amount of injected water and injection pressure by injecting water into an injector and a water feeding section(20) for supplying water into the injector of the measuring section(30). A gas supply section(10) supplies predetermined gas pressure into the water feeding section(20) so as to allow water to be supplied into the gas supply section(10). The measuring section(30) is connected to a computer so as to allow users to measure the amount of water and pressure of water injected from the injector.

Description

Testing device of injecter for liquid fuel rocket

The present invention relates to a liquid rocket injector test apparatus, which stores a gas supply unit for supplying pressurized nitrogen gas and water supplied from the outside so as to measure the injection pressure and the injection amount of an engine injector used in a liquid rocket in more detail. It can be stored in the tank and supplied to the injector of the measuring unit by pressurization, and outputs a feedback signal to the servo control valve according to the change in the pressure supplied to the injector so that pressurized nitrogen gas pressure can be provided, thereby allowing a plurality of injector flow rate changes The present invention relates to a liquid rocket injector test apparatus that enables accurate analysis on a computer.

In general, the development of a liquid rocket engine requires not only precision manufacturing based on theoretical design but also airway tests on individual parts and assemblies, and the performance of the product must be verified. Proven.

The performance of the engine is determined by the thermodynamic behavior of the propellant in the combustion chamber. The injector, which directly supplies the propellant to the combustion chamber and directly affects the mixing and atomization of the propellant, is the most essential part of the liquid rocket engine. To be very careful from production to testing.

The injector designed through theoretical analysis is very large and uniformly manufactured. Especially in the case of the injection hole processing supplying the propellant, it should satisfy not only the tolerance of diameter but also the formation tolerance of surface roughness, position and angle. Even manufactured injectors do not exhibit the same performance when propellant injection. Therefore, after injector processing that satisfies all tolerances, water injection tests are performed for each injection hole using pseudo-propellant for each injector, and the injectors to be assembled in one engine are selected by evaluating the flow rate of each injector. As the number of injectors assembled in the engine increases, the water flow test process becomes a significant part of the engine development period.

The present invention is to solve such a conventional problem, the object of the gas supply unit for supplying pressurized nitrogen gas to measure the injection pressure and the injection amount of the engine injector used in the liquid rocket and the water supplied from the outside Is stored in the storage tank and supplied to the injector of the measuring unit by pressurization, and outputs a feedback signal to the servo control valve according to the change of the pressure supplied to the injector so that pressurized nitrogen gas pressure can be provided, thereby providing a plurality of injector flow rates. The goal is to analyze changes precisely on a computer.

1 is a block diagram of a liquid rocket injector test apparatus according to an embodiment of the present invention.

Figure 2a, b is a connection diagram of the liquid rocket injector test apparatus according to an embodiment of the present invention.

3A, 3B, and 3C are graphs of injector pressure changes that change with time according to an embodiment of the present invention.

4 is a block diagram of a measurement computer user selection mode according to an embodiment of the present invention.

Code descriptions for the main parts of the drawings

10; Gas supply section 11; nitrogen tank

20; water supply unit 21; air pressure valve

22; manual valve 23; relief valve

25; storage tank 30; measuring unit

31; test jig 32; discharge induction pipe

33; storage tank for measurement 34; storage tank for discharge

35; weight measuring instrument 38; signal processing unit

39; A / D converter 41; measuring computer

51; hydro check 52; characteristic check

53; Analog signal check 54; Digital signal check

LT; Water gauge PG; Pressure gauge

T; Thermometer R; Regulator

PT; pressure transmitter SCV; servo control valve

D1; discharge line SV; solenoid valve

AC; air cylinder

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the most preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. . Other objects, features, and operational advantages, including the purpose, working effects, and the like of the present invention will become more apparent from the description of the preferred embodiment.

For reference, the embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment, Various changes and modifications are possible within the scope without departing from the technical spirit of the present invention, as well as other equivalent embodiments will be found.

1 is a block diagram of a liquid rocket injector test apparatus according to an embodiment of the present invention, Figure 2 is a connection diagram of a liquid rocket injector test apparatus according to an embodiment of the present invention, Figures 3a, 3b, 3c 4 is a graph of a change in injector pressure changing with time according to an embodiment of the present invention, and FIG.

The present invention relates to a device capable of specifying the injection amount and the injection pressure of the injector used in the liquid rocket, as shown in Figures 1 to 4, the gas pressure supply unit 10 for supplying the gas pressure by filling the gas, and the gas pressure The water supply unit 20 for supplying a predetermined amount of water filled inside by the gas pressure supplied from the supply unit 10, and the water supplied from the water supply unit 20 to the injector and the amount of water injected by the injector It has a configuration that the measuring unit 30 for measuring the pressure is connected.

In addition, the measurement unit 30 is connected to the signal processing unit 38 therein so as to exchange information related to the supply state and the discharge state by the electrical signal to each valve.

The gas pressure supply unit 10 has a configuration in which a predetermined number of nitrogen tanks 11 are provided so that a certain amount of nitrogen pressurized to a predetermined pressure can be supplied to the outside.

The water supply unit 20 is connected to the storage tank 25 to which the pneumatic valve 21 and the plurality of manual valves 22 are connected so that a predetermined amount of water can be supplied.

The storage tank 25 is connected to the relief valve 23 so that water can be discharged.

The storage tank 25 is connected to the water level (LT) for measuring the water level, the pressure gauge (PG) for measuring the water pressure, the water thermometer (T) for measuring the temperature of the water, the pressure transmitter for supplying pressurized water PT, a regulator (R) for depressurizing a constant filling pressure bar (bar), and water at a pressure reduced in the regulator (R) to the storage tank (25) while simultaneously supplying the gas pressure supply unit (10) Servo control valve (SCV) is connected to regulate gas pressure.

In addition, the storage tank 25 is coupled to the manual valve 22 and the pneumatic valve 21 in the discharge line (D1) to discharge the water to the outside below.

The measuring unit 30 is a test jig 31 having an injector mounted therein for receiving water discharged from the storage tank 25 and a solenoid valve receiving high pressure gas supplied from a gas pressure supply unit 10. (SV), the air cylinder (AC) in which the inner piston is operated by the gas pressurized by the solenoid valve (SV), and the injection direction from the injector of the test jig 31 in conjunction with the operating direction of the air cylinder (AC) The discharge induction pipe 32 to collect the water to be collected, the measurement storage tank 33 for measuring the amount of water falling from the discharge induction pipe 32, and stored in the measurement storage tank 33 Discharge storage tank 34 for discharging the water to the outside has a configuration that is connected.

The test jig 31 is connected to a pressure gauge (PG) and a pressure transmitter (PT) so as to detect the pressure degree injected from the injector.

The test jig 31 outputs an electric signal to the outside when the injection pressure of the injector is lower than the set pressure, so that the pressure is controlled by the pressure gauge PG and the pressure transmitter PT so that the pressure can be applied by the servo control valve SCV. The signal processor 38 is connected to output the feedback signal to the valve SCV.

In addition, the signal processor 38 is connected to a weight gauge 35 mounted under the measurement tank 33 to measure the amount of water injected from the injector.

In addition, the signal processing unit 38 measures the state of the water flowing into the storage tank 25 of the water supply unit 20 or the state of the water flowing out, and at the same time the water is discharged to the outside and the gas pressure by the servo control valve (SCV) It has a configuration that is connected to the corresponding pneumatic valve 21 to each outflow pipe so as to measure the.

In particular, the signal processor 38 converts a digital signal into a measurement computer 41 for measuring the injection amount and the injection pressure of the injector through a program set therein, and an analog signal to the measurement computer 41. The A / D converter 39 is connected to output.

The present invention configured as described above relates to a device capable of specifying the injection amount and injection pressure of the injector used in the liquid rocket. As shown in FIGS. 1 to 5, nitrogen pressure is applied to the injector by supplying nitrogen pressure at a constant pressure to the working fluid. The gas pressure supply unit 10 is to supply the gas filled in the nitrogen tank 11 so that.

The nitrogen tank 11 is to use a total of three tanks by making one set of 10 barrels filled with nitrogen at a pressure of 120 bar [40] to 40 [ℓ] amount.

The initial nitrogen tank 11 is supplied with nitrogen to the water supply unit 20 after the pressure of 110 to 120 bar [bar], which is the filling pressure, is reduced by the regulator R of the water supply unit. By supplying pressurized nitrogen gas to the measuring cylinder's air cylinder (AC) through the air cylinder (AC) is operated, the discharge pipe (32) connected to the air cylinder (AC) for the storage tank 33 for measurement and discharge By alternately moving the storage tank 34 receives the water sprayed from the injector.

Here, the water supply unit 20 receives water from the outside into the storage tank 25 to introduce the pressure and quantity of water through the plurality of manual valves 22 and the pneumatic valves 21 and again, the plurality of manual valves 22. And discharge through the air pressure valve (21).

The water supply unit 20 adjusts the water level and pressure of the water filled therein while checking the water temperature (T) and the pressure gauge (PG) and the pressure transmitter (PT) and the water level (LT) of the storage tank (25). Will be sent to the injector.

The measuring unit 30 receives the water drained from the storage tank 25 so that the injector in the test jig 31 can be injected, and the solenoid valve SV is provided with a gas pressure supply unit so as to receive and measure the water injected into the injector. The high pressure gas delivered in (10) can be sent to the lower air cylinder (AC).

At this time, the air cylinder (AC) is sprayed by spraying the injection sprayed from the injector to the measuring storage tank 33 is injected from the injector of the fixed piston (32) while the internal piston is operated from the high-pressure gas applied through the solenoid valve (SV) The water level of the water can be measured, and the measurement storage tank 33 is to send the received water to the discharge storage tank 34 to be discharged to the outside for re-measurement of the injection amount after the injector injection measurement.

Here, when the gas pressure applied to the injector drops below the set pressure of 5 bar [bar], the signal processor 38 connected to the test jig 31 by the pressure gauge PG mounted on the side of the test jig 31 is By outputting a feedback electric signal to the servo control valve (SCV) side, the servo control valve (SCV) is opened to supply the pressurized gas of the gas supply unit 10 to the injector.

Meanwhile, the signal processor 38 of the present invention monitors an electrical signal so that the injection amount and the injection pressure of the injector can be adjusted by an external electric signal, and the signal processor for measuring the injection amount and the injection pressure of the injector ( The measuring computer 41 connected to 38 inputs a digital signal output from the A / D converter 39 of the signal processing unit 38 to execute an internal program and display it on the monitor as a graph or a character. .

The measurement computer 41 displays a picture of the storage tank 25 of the water supply unit 20 on the monitor screen and connects the water supply unit 20 and the server control valve (SCV) connected to the storage tank 25. It is to be able to see the gas flow state of the supply pipe to be, and to see the state that the water is discharged to the outside and the state that the water is discharged to the measuring unit 30.

The experiment of the measuring computer 41 is to set the pressure of the gas or the amount of water supply before performing the experiment, and when the experiment starts, it is pressurized while supplying nitrogen to the storage tank 25 and spraying while supplying water to the injector. .

Here, the water supplied to the injector is discharged to the discharge storage tank 34 until the injector pressure drop reaches the input test pressure and is stabilized, and the storage tank is input during the test time input after the pressure in the storage tank 25 is stabilized. It is accommodated in the measurement storage tank 35 of the measurement part 30 through each discharge induction pipe 32 of (25).

At this time, the measurement computer 41 executes the result obtained by measuring the amount of water stored in the measurement storage tank 40 on the monitor as shown in the graphs of FIGS. 3A to 3C.

As shown in Figures 3a to 3c the present invention shows the change in injector pressure changes over time as the pressure of the injector is carried out at 3,5,7 bar [bar] three times per pressure to confirm the reproducibility of the test Will be performed.

In addition, the present invention is to set the time of the serum at intervals of 15 seconds in order to perform about 300 tests of the injector per engine, the amount of water sprayed during this time is converted into a vaginal flow rate. The measured flow rate deviation is measured 15 times with the same injector pressure drop, and the deviation between the set pressure drop and the actual measured pressure drop is about ± 0.2%.

The user selects and uses the measurement method as shown in Fig. 4 for the measurement computer 41 to perform the above-described test.

First, a hydro test step 51 for checking a fuel supply or a water or gas supply state, which is a plurality of modes displayed on a monitor of a measurement computer, and a storage tank 25 of the water supply unit 20. Characteristic test step (52) for checking the amount of water in the), analog signal test step (53) for displaying and calibrating the analog signal transmitted from the sensor or valve as a physical quantity, and various valves From the configuration consisting of a digital test step (54) for outputting a signal to supervise the operation and operation of the user, the user is to select and perform one of the objects to be checked among them.

When the user selects the hydro-check 51 or the characteristic-check 52 above, a test relating to the injection amount and the pressure applied to the injector is performed, and the operator checks the storage tank 25 on the monitor of the measuring computer 41. When opening the control valve installed in the line for supplying water to the residual pressure in the storage tank 25 while the water is supplied to the water level through a pipe that can supply water to the water level and the control valve is automatically shut off.

Here, the control valve refers to a pneumatic valve 21 and a manual valve 22 to supply or discharge water to the storage tank 25 to supply or discharge the gas.

The hydrocheck 51 and the feature check 52 are basically the same to be tested, but have a difference in not supplying water or gas to the test jig 31 of the measuring unit 30 at the time of the feature check 52.

In addition, when the operator wants to discharge the water or gas of the virtual storage tank 25 appearing on the monitor of the measuring computer 41, to supply the water drain or water drain to completely discharge the water to the outside The vent side pipe to be discharged is selected and executed.

On the other hand, the operator adjusts the amount or pressure of the water required in the storage tank, and adjusts the pressure of the gas and then set the water injection amount and the gas pressure adjusting ability of the storage tank 25.

In the test of the storage tank 25, the gas is supplied to the gas inflow observation by closing the control valve so that the pressure in the storage tank 25 becomes 70% of the set pressure and closes the pipe through which the gas is discharged. Allow the specified pressure to be applied to the control valve (SCV) side.

In addition, the storage tank 25 allows the water to be supplied into the interior when the pressure reaches 70% of the set pressure.

Here, the measurement computer 41 can graph and store the data related to the gas pressure of the storage tank 25, the injection amount of water, etc. by time, and execute it.

On the other hand, if the user wants to perform the analog signal check 53 or the digital signal check 54, the user can select and adjust the picture or character appearing on the monitor of the measurement computer 41 to test the measurement unit 30. The signal processor 38 mounted in the jig 31 is connected to the valves of the gas supply unit 10 and the water supply unit 20 to input and output electrical signals, and the gas pressure applied to the injector of the measuring unit 30. The voltage is measured by the padback signal of the pressure gauge PG and the server control valve SCV and the control command signal is output to check whether there is a control.

In addition, the user may determine the electrical signal output from the weighing unit 35 installed on the bottom of the measuring storage tank 33 by the injection amount injected from the injector and confirms it through a graph output on the monitor.

The present invention acting as described above provides a water supply having a gas supply unit provided with a nitrogen tank and a storage tank storing water capable of supplying water to the injector to evaluate the performance of a plurality of injectors used in the liquid rocket. A signal processing unit is provided so that electrical signals can be transmitted to a test jig in which the injector is mounted inside, so that the user can check the quantity and injection pressure of water sprayed from the injector through the measuring computer. By selecting and measuring the method, a number of injector pressure adjustments and flow rate measurements can be made.

In addition, the present invention has the effect of ensuring the accuracy of the test by maintaining a constant target pressure by using a feedback control element and the server control valve for the precision of the test apparatus.

In addition, the present invention can be used not only as an injector, but also as a correction mechanism of a fluid flow mechanism, and has an effect that can be used as a quasi-propellant supply device for design performance (dividing characteristic, atomization characteristic) test performed when developing various injectors.

Claims (6)

In the apparatus for operating the injector mounted on the liquid rocket, the measuring unit 30 for measuring the amount and the injection pressure of the water sprayed by injecting water to the injector, and a predetermined amount of water to the injector of the measuring unit 30 The water supply unit 20 for supplying to the water, the gas pressure supply unit 10 for supplying a predetermined gas pressure to the water supply unit 20 to supply water to the injector at the gas pressure, and the measuring unit 30 Liquid rocket injector testing device made in connection with the measurement computer 41 to allow the user to directly measure on the monitor through the program set inside the injector injection pressure and injection pressure. According to claim 1, wherein the gas pressure supply unit 10 is a liquid rocket injector test apparatus is made of a predetermined number of nitrogen tanks (11) arranged to supply a predetermined amount of nitrogen pressurized to a predetermined pressure. According to claim 1, wherein the water supply unit 20 is a pneumatic valve 21 and a plurality of manual valves 22 so that a certain amount of water can be supplied, a relief valve 23 so that water can be discharged, and the water level Level gauge (LT) for measuring the pressure, pressure gauge (PG) for measuring the pressure of the water is connected, water temperature (T) for measuring the temperature of the water, pressure transmitter (PT) for supplying the pressurized water, and constant filling pressure A regulator (R) for depressurizing a bar (bar), and the servo control valve (SCV) is connected to supply the water of the reduced pressure to the regulator (R) and to adjust the gas pressure of the gas pressure supply unit (10). Liquid rocket injector testing device further comprises a storage tank (25). According to claim 1, The measuring unit 30 is mounted inside the injector for receiving and spraying the water discharged from the storage tank 25 of the water supply unit 20 and the external measuring computer 41 and the electric A test jig 31 having a signal processor 38 integrally connected with an A / D converter 39 capable of mutually transferring signals, and a solenoid valve SV receiving high pressure gas supplied from a gas pressure supply unit 10; In addition, the air is injected from the solenoid valve (SV) to the air cylinder (AC) to operate the internal piston and the operating direction of the air cylinder (AC) and collect the water injected from the injector of the test jig 31 A measurement storage tank 33 connected to a weight measuring device 35 at a bottom thereof so as to measure an amount of water falling from the discharge induction pipe 32 and the discharge induction pipe 32, and the measurement storage The water stored in the tank 33 can be discharged to the outside Liquid rocket injector testing device consisting of a discharge storage tank (34) to be locked. The test jig 31 is electrically connected to the outside when the injector injection pressure of the pressure gauge PG and the pressure transmitter PT is less than or equal to the set pressure so as to check the degree of pressure injected from the injector. Outputs a signal so that the pressure can be applied by the servo control valve (SCV) so that the feedback signal from the pressure gauge (PG) and the pressure transmission system (PT) to the servo control valve (SCV) can be output from the signal processor 38 Liquid rocket injector testing equipment. 5. The measuring computer (41) according to claim 4, wherein the measuring computer (41) includes a hydro test (51) for checking a fuel supply or a supply state of water or gas, which is a plurality of modes displayed on a monitor by the user. Characteristic test 52 for confirming the amount of water in the storage tank 25 of the supply unit 20, and analog signal test (analog test) for displaying and correcting analog signals transmitted from various valves as physical quantities ( 53) and a liquid rocket injector test apparatus configured to select and execute a program set to a digital test (54) for outputting signals to supervise the operation and operation of various valves.