Balanced drainage test system

Abstract

The present invention relates to a balanced liquid discharge test system, which has the following structure: the gas source is connected to two buffer gas cylinders, the two buffer gas cylinders are respectively connected to the simulated diaphragm storage tank, the outlets of the simulated diaphragm storage tank are respectively provided with main orifice plates, the outlets of the two main orifice plates are collected through pipelines, the collected pipelines are connected to multiple branch working condition pipelines, each branch working condition pipeline is sequentially provided with a front end orifice plate, a solenoid valve and a rear end orifice plate; pressure sensors are provided at both ends of the solenoid valve and the two ends of the main orifice plate; a weighing sensor is provided under the simulated diaphragm storage tank. The system can simulate the real product working environment while fully verifying the reliability of the product; it can accurately measure the change in the center of mass and the balance when the diaphragm is turned over and discharged; it can ensure that the specified working condition is opened at any time according to the set timing.

Description

Technical Field

[0001] The invention relates to a simulated working condition test system, in particular to a balanced liquid discharge test system. Background Art

[0002] At present, in the domestic attitude control engine system, the storage of fuel and oxidizer is realized by tanks. During the flight, the center of mass change of the cabin is mainly caused by the fuel consumption in the tank, so the center of mass change value of the tank is particularly important. Therefore, when there are multiple tanks of the same propellant at the same time, it is necessary to complete the balanced emission test of the tanks, and also to test the lateral displacement of the center of mass of a single tank. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention provides a balanced liquid discharge test system, which can simulate the actual working flow of the system and the actual flow resistance difference between two storage tanks.

[0004] The technical solution of the present invention is as follows:

[0005] A balanced liquid discharge test system, wherein the gas source is connected to two buffer gas cylinders, the two buffer gas cylinders are respectively connected to a simulated diaphragm storage tank, the outlets of the simulated diaphragm storage tank are respectively provided with main circuit orifice plates, the outlets of the two main circuit orifice plates are collected through pipelines, the collected pipelines are connected to a plurality of branch working pipelines, each branch working pipeline is sequentially provided with a front end orifice plate, a solenoid valve and a rear end orifice plate; pressure sensors are provided at both ends of the solenoid valve and both ends of the main circuit orifice plate; a weighing sensor is provided below the simulated diaphragm storage tank.

[0006] The gas source is a nitrogen bottle.

[0007] A pressure reducer and a pressure sensor are provided between the gas source and the buffer gas cylinder.

[0008] A pressure sensor is provided between the buffer gas cylinder and the simulated diaphragm storage tank.

[0009] The weighing sensors are respectively arranged at three points in the form of an equilateral triangle, and a total weight weighing sensor is arranged at the center point of the equilateral triangle.

[0010] The advantages and effects of the present invention are as follows:

[0011] The system can simulate the real product working environment and fully verify the reliability of the product's work; it has an independent center of mass test system; an independent drainage system; an independent air supply system; an independent working condition control system; an independent pressure measurement system; it can accurately measure the center of mass change and balance when the diaphragm flips and drains; and it can ensure that the specified working conditions can be started at any time according to the set sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the principle structure of the present invention.

[0013] In the figure, 1, buffer gas cylinder, 2, simulated diaphragm storage tank, 3, main line orifice plate, 4, front end orifice plate, 5, solenoid valve, 6, rear end orifice plate, P, pressure sensor. DETAILED DESCRIPTION

[0014] Example

[0015] A balanced liquid discharge test system, wherein the gas source is connected to two buffer gas cylinders 1, the two buffer gas cylinders 1 are respectively connected to a simulated diaphragm storage tank 2, the outlets of the simulated diaphragm storage tank 2 are respectively provided with main orifice plates 3, the outlets of the two main orifice plates are collected through pipelines, the collected pipelines are connected to a plurality of branch working pipelines, each branch working pipeline is sequentially provided with a front end orifice plate 4, a solenoid valve 5 and a rear end orifice plate 6; pressure sensors are provided at both ends of the solenoid valve and both ends of the main orifice plate; a weighing sensor is provided below the simulated diaphragm storage tank.

[0016] The gas source is a nitrogen bottle.

[0017] A pressure reducer and a pressure sensor are provided between the gas source and the buffer gas cylinder.

[0018] A pressure sensor is provided between the buffer gas cylinder and the simulated diaphragm storage tank.

[0019] The weighing sensors are respectively distributed at three points in the form of an equilateral triangle. The weighing sensors distributed at three points are used to test the change of the center of mass. A total weight weighing sensor is set at the center point of the equilateral triangle, and the total weight weighing sensor is used to test the balance.

[0020] The orifice size of the tank outlet orifice plate is determined by the pressure drop method to determine the water flow rate under various working conditions. The formula is: Wherein μ is flow coefficient, which is determined according to the liquid flow test; A is pipeline area; Δp is the required pressure drop, which is calculated according to the water flow formula. The orifice pressure here is determined according to the pressure distribution of the main propulsion system. In the early stage, liquid flow tests were carried out on all pipelines and each single machine to obtain the flow resistance values ​​under various working conditions, according to the product pressure reducer outlet pressure value; according to the simple pressure transmission formula: pressure reducer outlet pressure - tank outlet pressure (without diaphragm) - assumed diaphragm pressure (0.1MPa) - pipeline flow resistance under corresponding working conditions - each single machine flow resistance = throttling orifice pressure. Here, the pressure of the throttling orifice plate should be divided into the throttling orifice plate pressure before the solenoid valve and the uniformity pressure adjusted at the tank outlet. This pressure distribution needs to consider the relationship between the length-diameter ratio of the orifice plate. Therefore, the size of the length-diameter ratio determines the critical cavitation coefficient of the propellant. The critical cavitation coefficient = (outlet pressure-cavitation pressure (medium)) / (inlet pressure-outlet pressure). According to the liquid flow test data, when the value on the right side of the equation is less than 0.4, a hissing sound will appear. This sound represents water cavitation. Therefore, when selecting the pressure drop and aperture ratio of the orifice plate, consider this aspect. According to the flow rate of 2000N+2*50N, the base pressure drop of the tank outlet orifice plate is set to 0.2MPa. According to the flow formula: Determine the base orifice plate diameter.

[0021] The throttling orifice plate method is used to simulate the actual working conditions. According to the same method, based on the relationship between flow rate and critical cavitation coefficient, the pressure drop is selected based on the pressure that the uniformity tooling tank can withstand. The pressure of the test tooling is 0.8-1.0Mpa, and the flow resistance of the tooling pipeline is measured under different working conditions. According to the pressure transmission method, the pressure and orifice plate diameter under each working condition are obtained.

[0022] In this application, all pressure sensors constitute a pressure measurement system, and all solenoid valves constitute a working condition control system. The air supply system consists of a pressure reducer and a buffer gas tank. The balanced drainage system consists of a set of pipelines and orifice plates containing 7 working conditions. The front-end system main line orifice plate adjusts the flow resistance of the pipeline before the confluence, the front-end orifice plate balances the liquid pressure entering the solenoid valve, and the tail end orifice plate controls the output flow.

Claims

1. A balanced drainage test system, characterized in that The gas source is connected to two buffer gas cylinders, and the two buffer gas cylinders are respectively connected to the simulated diaphragm storage tank. The outlets of the simulated diaphragm storage tank are respectively provided with main circuit orifice plates. The outlets of the two main circuit orifice plates are collected through pipelines. The collected pipelines are connected to multiple branch working condition pipelines. A front end orifice plate, a solenoid valve and a rear end orifice plate are sequentially arranged on each branch working condition pipeline; pressure sensors are arranged at both ends of the solenoid valve and both ends of the main circuit orifice plate; a weighing sensor is arranged below the simulated diaphragm storage tank; The gas source is a nitrogen bottle; A pressure reducer and a pressure sensor are provided between the gas source and the buffer gas cylinder; A pressure sensor is provided between the buffer gas cylinder and the simulated diaphragm storage tank; The weighing sensors are respectively arranged at three points in the form of an equilateral triangle, and a total weight weighing sensor is arranged at the center point of the equilateral triangle; The orifice size of the tank outlet orifice plate uses the pressure drop method to determine the water flow rate under various working conditions. The formula is: in μ - Flow coefficient, determined by liquid flow test; A-pipeline area; Δp —Required pressure drop, calculated according to this water flow formula, the orifice pressure is determined according to the pressure distribution of the main propulsion system. In the early stage, all pipelines and all units are tested for liquid flow to obtain the flow resistance value under various working conditions. According to the outlet pressure value of the product pressure reducer, according to the pressure transfer formula: pressure reducer outlet pressure - tank outlet pressure without diaphragm - assumed diaphragm pressure - pipeline flow resistance under corresponding working conditions - each unit flow resistance = throttling orifice pressure; the throttling orifice pressure should be divided into the throttling orifice pressure before the solenoid valve and the tank outlet adjustment uniformity pressure. The pressure distribution needs to consider the relationship between the orifice length-diameter ratio. Therefore, the size of the length-diameter ratio determines the critical cavitation coefficient of the propellant. The critical cavitation coefficient = (outlet pressure - cavitation pressure of the medium) / (inlet pressure - outlet pressure); according to the flow rate of 2000N + 2 × 50N, the tank outlet orifice base pressure drop is set to 0.2MPa. According to the flow formula: Obtain the reference orifice plate diameter; According to the relationship between flow rate and critical cavitation coefficient, the selection of pressure drop is determined according to the pressure that the uniformity tooling tank can withstand. The pressure of the test tooling is 0.8-1.0Mpa, and the flow resistance of the tooling pipeline under different working conditions is measured. According to the pressure transmission method, the pressure and orifice plate diameter under each working condition are obtained.

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