RU2543702C1 - Method and test rig for determination of hydraulic residues of fuel in missile tank - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: test rig contains a drain tank, consumption pipeline with installed continuity transmitters, flowmeter, hydraulic pump, shutoff valve, and device for fuelling and drainage, to which the dosing unit for water topping is connected. The water dosing unit is set to the work volume equal to the volume of the expected hydraulic residues of tested fuel tank connected to the consumption pipeline. The top part of the drain tank is made in form of vertical tapering upward cone nozzle with taper 15°, on which the second continuity transmitter and overflow tank are installed. The rig contains loop main with shutoff valve connected in the consumption pipeline at the pump inlet, and fuelling pipeline with valve connected in the consumption pipeline at the pump output, which second end is connected to the consumption pipeline upstream the shutoff valve. Prior to the tested tank fuelling the consumption pipeline and drain tank are completely filled with water, then the hydraulic system is topped with dosed water volume equal to the expected hydraulic residues. Then testing is performed. Upon activation of both continuity transmitters in any sequence the shutoff valve is closed, moment of gas blow-by to the consumption pipeline and the drain tank complete filling are recorded. Then based on the known flow rate and time values, as well as topping volume ensured by the dosing unit the hydraulic residues are calculated.

EFFECT: increased accuracy of the hydraulic residues determination in the tested missile tank, and reduced labour intensity of tests.

2 cl, 1 dwg

Description

The invention relates to rocket technology and can be used in the experimental testing of intake devices installed in the fuel tanks of rockets for the experimental determination of hydraulic residues of fuel intake.

A well-known stand for experimental and research work related to the study of the resistance of pipelines and jet-forming devices. The stand contains a main tank, a pipeline with a valve, a drain tank, a pump and a liquid level indicator in the main tank (RF patent No. 2275607, IPC G01F 25/00).

This stand allows you to conduct research and calibrate various flow meters, but cannot be used for work related to the study of intake devices installed in the fuel tanks of rockets.

Also known are a hydraulic stand and a method of conducting tests on it, described in an article by V.I. Ilyin “Hydraulic stand for working off fuel tank intake devices”, published in the collection “Design and development of products and objects”, Issue 3, Central Scientific Research Institute “Search”, 1972 (http://www.rtc.ru/encyk/biogr-book /09I/1125.shtml).

The specified stand contains a drain tank and a supply line, in which a continuity sensor, a flow meter and a shut-off valve are installed. One of the tasks of research conducted at this stand is to determine the values of hydraulic residues of fuel intake in the tank.

As a prototype, a stand has been adopted for working out sampling devices by pouring water, containing a drain tank with a measuring pipe docked to the top and a supply line with a continuity sensor, a flow meter, a shut-off valve, and a loopback valve with a valve connecting the pump inlet with a drain tank (SKB-385, mechanical engineering design bureau, GRC "Design Bureau named after academician VP Makeev", M., "Military parade" - GRTS "design bureau named after academician VP Makeev", 2007, p. 187 and technical report No. 32-155-77 “Determination of non-recoverable liquid residues spans in tanks “O” and “G” in static mode ... ”, GONTI-11, 1977).

Tests on this test bench are carried out by pouring water into the test fuel tank from the test tank into the drain tank along the supply line with a given flow rate. At the same time, the continuity of the flow is measured and, when a gas breaks out of the tank into the supply line, the shut-off valve is closed and the remaining water in the tank is measured.

The disadvantage of the prototype is the lack of accuracy in determining the hydraulic residues of fuel intake in the tank and the high complexity of the tests, due to the fact that the measurement of residues of the intake, the value of which can reach several hundred liters, is carried out either using measuring tanks or by complex mathematical calculations.

The objective of the invention is to increase the accuracy of determining the hydraulic residue of fuel intake in the tank and reduce the complexity of the experimental work.

The problem is solved in that when determining the hydraulic residues of fuel intake in the rocket tank, in which the test tank is filled with water, empty it with the specified flow rate through the supply line into the drain tank, record the flow rate and the moment of gas breakthrough from the test tank into the supply line, stop its emptying by closing the supply line and determine the hydraulic residue of the intake, before filling the test tank, the supply line and the drain tank are completely filled with water. After that, in the period before the tank is emptied, it is refilled with water or a tank with a volume equal to the expected hydraulic residue of the intake, when the tank is empty, the moment the tank is completely filled with water and after fixing in any order both time points (the moment of gas breakthrough into the supply line and the moment the drain tank is completely filled with water), the supply line is closed, and then the volume of the hydraulic residue of the intake is determined by the formula:

where Vdose is the volume of refueling;

t _B is the moment of gas breakthrough from the test tank into the supply line;

t _With - the moment of full filling of the drain tank;

Q is the predetermined flow rate of water from the test tank during emptying.

To implement the proposed method in a stand for determining hydraulic residues of fuel intake in a rocket tank containing a drain tank, a flow line, on which a continuity sensor, a flow meter, a shut-off valve, a flow regulator, a hydraulic pump are installed, the input of which is connected to the drain tank by a loop back loop with installed in it a valve connecting the pump inlet to the drain tank, and a device for filling and draining, a water refueling dispenser configured to and the working volume equal to the volume of the expected hydraulic residue of the intake, the upper part of the drain tank is made in the form of a vertical tapered nozzle tapering upwards with a taper of 15 ⁰ , on which a second continuity sensor and a tank for overflow are installed, a shut-off valve is installed on the supply line between the pump and the drain tank crane, and the pump outlet through the refueling line with a shut-off valve installed on it is connected to the section of the supply line in front of the shut-off valve.

The set of distinctive features of the invention provides a solution to the problem.

The invention is illustrated in the drawing, where Fig.1 shows a structural diagram of a stand for determining the hydraulic residues of fuel intake in the rocket tank.

The stand includes a drain tank 1, a supply line 2. On the drain line 2, a continuity sensor 3, a flow meter 4, a shut-off valve 5, a hydraulic pump 6 and a valve 7 are installed. In addition, the stand is equipped with a filling and drain device 8, to which a dispenser is connected 9 refueling water. The working volume of the dispenser 9 is set to a volume equal to the volume of the expected hydraulic residue of the non-intake of the test fuel tank 10 with a intake 11 connected to the supply line 2. The device 8 is designed to completely fill the dispenser 9, the supply line 2 and the drain tank 1 with water, as well as to drain water from them. The device 8 is made in the form of a valve block connected to the water supply.

A conical nozzle 12, a second continuity sensor 13, and an overflow tank are mounted on the upper part of the drain tank 1. The nozzle 12 is made tapering upward with a taper of 15 ⁰ , which makes it possible to stabilize the surface of rising water from the drain tank 1 when the test tank 10 is emptied. Overflow tank 14 protects the discharge of water from the hydraulic system during testing.

A loop line 15 with a shut-off valve 16 is built into the input of the pump 6, which connects the input of the pump 6 to the drain tank 1 and, when the pump is turned on, provides (with the shut-off valve 5 closed and the valves 7, 16 open) its output to normal operation. At the pump outlet 6, a refueling line 17 with a valve 18 is connected, which connects the pump outlet 8 with a section of the supply line 2 in front of the shut-off valve 5. Thus, through the line 17 (with open valves 16, 18 and the shut-off valve 5 and valve 7 closed), the test tank 10 pump 6 is filled with water from the drain tank 1.

The continuity sensors 3, 13 and the flowmeter 4 are electrically connected to the recording equipment. The shut-off valve 5, valves 7, 16, 18 and the valve block of device 8 are electrically connected to the control panel of the bench control system. The recording equipment and the control system console, as well as the flow rate regulator for the emptying of the test tank 10 are not conventionally shown in the drawing.

The following describes the implementation features of the proposed method and the operation of the stand when testing intake devices and determining the hydraulic residues of fuel intake in the rocket tank.

I stage. Starting position before the test.

The drain tank 1 and the supply line 2 using the device 8 are completely filled with water to the level of operation of the continuity sensors 3 and 13. The working volume of the dispenser 9 is adjusted to the volume equal to the expected hydraulic residue and is filled with water. The shut-off valve 5 and valve 18 are closed, valves 7 and 16 are open.

II stage. Refueling the test tank 1.

Turn on the pump 6, after it enters the mode, open valve 18 and close the valve 7. Through the loopback loop 15, pump 6, the refueling line 17 and the supply line 2, water from the drain tank 1 enters the test tank 10. After filling the test tank 10 to the specified level close valve 18, open valve 7 and turn off pump 6. Dispenser 9 refuel the stand hydraulic system with water equal to the expected hydraulic residue.

III stage. Emptying (testing) the simulator of the test tank 1 with a given flow rate.

In the initial position before the test: the hydraulic system of the stand is adjusted by the flow regulator (not shown in the diagram) to the specified discharge rate of the test tank 10; the test tank 10 is filled to a predetermined level; the hydraulic system was refilled with water with a volume equal to the expected hydraulic residue; shut-off valve 5 and valve 18 are closed, valves 7 and 16 are open.

The test is carried out as follows. Turn on the pump 6, after it enters the mode, open the shut-off valve 5 and close the valve 16. Water from the test tank 10 at a given flow rate through the flow line 2 is emptied into the drain tank 1. At the same time, the readings of the flow meter 4 and the continuity sensors 3 and 13 are recorded. triggering in any order of the continuity sensors 3 and 13 (i.e., after the gas breaks out from the test tank 10 into the supply line 2 and the drain tank 1 is completely filled with water), the shut-off valve 5 is automatically closed, the pump 6 is turned off and the valve 16 is opened. Test this is done.

IV stage. Processing the test results and calculating the hydraulic residue of the intake in the test tank 1.

In the process of processing the test results according to the flow meter, the flow rate of water flowing through the flow line 2 when emptying the test tank 10 during the test is determined. And according to the readings of the continuity sensors 3 and 13, the moment of gas breakthrough from the test tank 10 to the supply line 2 and the moment of full filling of the drain tank 1 is determined. Then, knowing these time points, the amount of refueling water into the stand hydraulic system before the test and the water flow from the test tank 10 , calculated by the formula (1), the value of the hydraulic residue, from this value of which a conclusion is made about the operability of the intake device 11.

The proposed method for determining the hydraulic residues of fuel intake in the rocket tank and the stand for its implementation can improve the accuracy of determining hydraulic residues in the fuel tank and reduce the complexity of experimental studies of intake devices installed in the fuel tank.

The proposal is recommended for implementation.

Claims (2)

1. A method for determining hydraulic residues of fuel intake in a rocket tank, in which the test tank is filled with water, empty it with a predetermined flow rate through the flow line into the drain tank, record the flow rate and the moment of gas breakthrough from the test tank into the flow line, stop its emptying by closing the flow line and determine the hydraulic residue of the intake, characterized in that before refueling the test tank, the supply line and the drain tank are completely filled with water, then in the period to The beginning of the emptying of the tank refuel it or the drain tank with water equal to the expected hydraulic residue of the intake; when emptying the tank, the moment of complete filling of the drain tank with water is recorded, the flow line is closed after fixing both times in any order, and the volume of the hydraulic residue of the intake is determined by the formula :
Vgo = Vdose- (t _B -t _C ) × Q,
where Vdose is the volume of refueling;
t _B is the moment of gas breakthrough from the test tank into the supply line;
t _With - the moment of full filling of the drain tank;
Q is the predetermined flow rate of water from the test tank during emptying. 2. A stand for determining the hydraulic residues of the intake in the rocket’s fuel tank, containing a drain tank, a supply line, on which a continuity sensor, a flow meter, shut-off valve, flow regulator, and a hydraulic pump are installed, the input of which is connected to the drain tank by a loopback loop, installed on it a valve connecting the pump inlet to the drain tank, and a filling and draining device, characterized in that a water refueling dispenser connected to the filling and draining device is set to the working volume m, equal to the volume of the expected hydraulic residue of the intake, the upper part of the drain tank is made in the form of a vertical tapering conical nozzle with a taper of 15 °, on which a second continuity sensor and a tank for overflow are installed, a shut-off valve is installed on the supply line between the pump and the drain tank, and the pump outlet through the refueling line, with a shut-off valve installed on it, is connected to the section of the supply line in front of the shut-off valve.