CN-121994499-A - Oil supply and return fuel system for main combustion chamber ignition performance test and adjusting method

CN121994499ACN 121994499 ACN121994499 ACN 121994499ACN-121994499-A

Abstract

The application provides an oil supply and return fuel system for a main combustion chamber ignition performance test and an adjusting method, which belong to the technical field of aeroengine tests and comprise an oil storage tank, a fuel degassing device, a fuel pump, a plurality of flowmeters with different ranges, an electric heater, a gas-heat exchanger, an electromagnetic three-way valve, an adjustable throttling device and a plurality of adjusting valves, wherein an inlet of the fuel pump is connected with the oil storage tank through the fuel degassing device, one way of an outlet of the fuel pump is connected with an oil return port of the oil storage tank through the oil return adjusting valve, and the other way is connected with the flowmeters with different ranges which are arranged in parallel through the oil supply adjusting valve; the three flow paths are connected to a first port of the electromagnetic three-way valve, a second port of the electromagnetic three-way valve is connected to a test piece, and a third port of the electromagnetic three-way valve is connected to an oil return port of an oil storage tank through an adjustable throttling device.

Inventors

ZHAO ZEFENG
ZHAO DONGYANG
ZHANG CHI
WANG HUI
WANG YANG
WANG CHAOQI

Assignees

中国航发沈阳发动机研究所

Dates

Publication Date: 20260508
Application Date: 20260316

Claims (9)

1. The fuel supply and return oil system for the ignition performance test of the main combustion chamber is characterized by comprising an oil storage tank (10), a fuel degassing device (20), a fuel pump (30), a plurality of flowmeters with different measuring ranges, an electric heater (50), a gas-heat exchanger (60), an electromagnetic three-way valve (70), an adjustable throttling device (80) and a plurality of regulating valves, wherein: An inlet of the fuel pump (30) is connected with the oil storage tank (10) through the fuel degassing device (20), one path of an outlet of the fuel pump (30) is connected to an oil return port of the oil storage tank (10) through an oil return regulating valve, and the other path of the outlet of the fuel pump is connected to a plurality of flowmeters with different measuring ranges which are arranged in parallel through the oil supply regulating valve; The utility model provides a flow meter rear end of a plurality of different ranges of parallelly connected setting gathers the back and connects the normal atmospheric temperature test valve that sets up respectively, low temperature test valve and heating test valve, through normal atmospheric temperature test valve forms normal atmospheric temperature flow path, through low temperature test valve and the gas heat exchanger (60) that low temperature test valve rear side set up form the low temperature pipeline, and through heating test valve and the electric heater (50) that heating test valve rear side set up form the heating flow path, normal atmospheric temperature flow path, low temperature flow path and heating flow path are connected to the first mouth of electromagnetism three-way valve (70), the second mouth of electromagnetism three-way valve (70) is connected to test piece (200), thereby the third mouth of electromagnetism three-way valve (70) is connected to the oil return mouth of oil storage tank (10) through adjustable throttling arrangement (80) and forms the oil return path.
2. The fuel supply and return fuel system for a main combustion chamber ignition performance test according to claim 1, wherein the fuel degassing device (20) is disposed between an outlet of the tank and an inlet of the fuel pump, for removing air or air bubbles existing in fuel drawn from the tank (10) in the pipeline, and the fuel degassing device (20) is provided with a first regulating valve (81) and a second regulating valve (82) respectively at front and rear sides thereof.
3. The fuel supply and return fuel system for a main combustion chamber ignition quality test of claim 1, wherein each of the flow meters has a respective one of the front and rear ends provided with a regulator valve.
4. The fuel supply and return fuel system for a main combustion chamber ignition quality test of claim 1, wherein the outlet of the fuel pump (30) is provided with a first pressure gauge (91) for monitoring the fuel pump outlet pressure.
5. The return fuel supply system for a main combustion chamber ignition quality test as set forth in claim 4, wherein said test piece (200) is provided with a second pressure gauge (92) before the inlet for monitoring the inlet pressure of the test piece 200.
6. The fuel supply and return system for a main combustion chamber ignition performance test according to claim 5, wherein a thermometer (93) is provided at a front end of the first port of the electromagnetic three-way valve (70) for monitoring fuel outflow temperatures of the normal temperature flow path, the low temperature flow path and the warming flow path.
7. The fuel supply and return system for main combustion chamber ignition performance test as claimed in claim 1, wherein the front sides and/or the rear sides of the plurality of flow meters of different ranges are connected by metal pipes conforming to length requirements to ensure stability of the measurement results.
8. The fuel return oil supply and supply system for a main combustion chamber ignition quality test of claim 7, wherein said metal tube is a metal hose.
9. A method of adjusting a fuel return system for a main combustion chamber ignition quality test as claimed in any one of claims 1 to 8, wherein the adjustment process includes a pre-test fuel adjustment and a test phase fuel supply adjustment, wherein: The pre-test fuel oil adjusting process comprises the following steps: S11, setting an adjustable throttling device (80) according to the opening pressure of the fuel nozzle of the test piece (200); S12, opening a first regulating valve (81), a second regulating valve (82) and an oil supply regulating valve; S13, selecting front and rear regulating valves of the flowmeter with proper measuring range according to the requirement of the test fuel flow, and keeping the front and rear regulating valves of the other flowmeters closed; s14, selecting and opening a proper normal temperature test valve, a proper low temperature test valve or a proper heating test valve according to the temperature requirement of the test fuel oil, and keeping the regulating valves of the other paths closed; S15, starting the fuel pump (30), regulating the fuel pump (30) to a preset power according to test requirements, keeping unchanged, at the moment, measuring the outlet pressure of the fuel pump along the oil storage tank (10), the first regulating valve (81), the fuel degassing device (20), the second regulating valve (82) and the fuel pump (30) through the first pressure gauge (91), measuring the fuel flow along the fuel supply regulating valve and the flow meter which is selectively opened, measuring the fuel temperature through the measuring point of the thermometer (93), finally returning the fuel to the oil storage tank (10) through the electromagnetic three-way valve (70) and the adjustable throttling device (80), gradually opening the oil return regulating valve, at the moment, directly returning part of fuel to the oil storage tank (10) through the oil return regulating valve, gradually reducing the flow of the fuel supply pipeline where the fuel supply regulating valve is positioned to the fuel flow required by the test, and completing the fuel regulation before the test; The fuel oil supply adjusting process in the test stage comprises the following steps: s21, after the flow of the oil supply pipeline where the oil supply regulating valve is located is regulated to a test state point, controlling the electromagnetic three-way valve (70) to enable fuel to enter the test piece (200), starting an ignition performance test, measuring the oil supply pressure of the test piece (200) through a test piece inlet pressure measuring point formed by the second pressure gauge (92), and recording the oil supply pressure and flow of the test piece (200); s22, controlling the electromagnetic three-way valve (70) to enable fuel to reenter the oil storage tank (10), and starting the adjustment of the next state point of the test piece according to the test requirement.

Description

Oil supply and return fuel system for main combustion chamber ignition performance test and adjusting method Technical Field The application belongs to the technical field of aero-engine tests, and particularly relates to a fuel supply and return oil system for a main combustion chamber ignition performance test and an adjusting method. Background The combustion chamber is an important core component of the aeroengine, the combustion chamber can normally work only in the specified air flow speed, temperature and pressure ranges, and under the condition that some external factors are disturbed strongly or working conditions change sharply, the conditions of starting ignition difficulty, surge or air flameout and the like of the aeroengine are easy to cause, so that a large number of verification tests of the ignition/flameout performance of the aeroengine are required to be carried out in different stages of design and development of the combustion chamber so as to study the ignition/flameout performance of the aeroengine. The current fuel supply system for the ignition performance test of the main combustion chamber mainly comprises an oil storage tank, a fuel pump, a flowmeter, an electromagnetic three-way valve and the like, wherein the electromagnetic three-way valve is arranged in front of an inlet of a test piece. In the fuel flow regulating stage, the electromagnetic three-way valve enables the direction of fuel flowing to the test piece to be closed and the direction of fuel flowing to the return oil to be opened, fuel flows out of the oil storage tank, fuel flow is pressurized by the fuel pump and measured by the fuel flow meter, then the fuel flows back to the oil storage tank through the return oil pipeline, and the frequency of the fuel pump is required to be continuously changed to regulate the fuel flow in the process until the fuel flow reaches the working condition required by the test. In the test stage, the electromagnetic three-way valve is controlled to enable the direction of fuel flowing to the test piece to be opened, the direction of fuel flowing to the return oil to be closed, the fuel enters the test piece, after the fuel flow is stable, the ignition performance test is started, and the fuel is continuously introduced into the test piece in the process. If the ignition is successful, the fuel flow is reduced according to a certain span until the ignition is failed, and the minimum fuel flow for successful ignition is recorded. However, the fuel supply system of the prior art has the following problems: 1) After the return oil flows into the oil storage tank, air bubbles exist in the fuel oil, surge of the pump is caused after the return oil enters the fuel pump, and a steam plug phenomenon is caused after the return oil enters the test piece, so that a test result is influenced; 2) In the adjustment stage, the fuel pump frequently changes frequency, when the test time is long, the conditions of heating of the frequency converter, unstable performance of the fuel pump and large fluctuation of fuel flow occur, the service life of the fuel pump is reduced, and the accuracy of test data is reduced; 3) In the test stage, fuel oil needs to continuously flow into a test piece, and the ignition performance test can be started after the flow is stable, so that fuel oil is wasted and deflagration danger exists; 4) The flowmeter of the fuel system is difficult to detach, the ball head and the press cap are easy to damage, oil leakage is caused at the joint, and the test efficiency is reduced. Disclosure of Invention The application aims to provide a fuel supply and return oil system for a main combustion chamber ignition performance test and a regulating method thereof, which solve or alleviate at least one problem in the background art. The technical scheme of the application is as follows: A fuel supply and return oil system for a main combustion chamber ignition performance test comprises an oil storage tank, a fuel degassing device, a fuel pump, a plurality of flowmeters with different measuring ranges, an electric heater, a gas-heat exchanger, an electromagnetic three-way valve, an adjustable throttling device and a plurality of regulating valves, wherein: The inlet of the fuel pump is connected with the oil storage tank through the fuel degassing device, one path of the outlet of the fuel pump is connected to an oil return port of the oil storage tank through an oil return regulating valve, and the other path of the outlet of the fuel pump is connected to a plurality of flowmeters with different measuring ranges which are arranged in parallel through the oil supply regulating valve; The back end of the flowmeter of a plurality of different ranges that parallel arrangement gathers the back and connects the normal atmospheric temperature test valve that connects the parallel arrangement respectively, low temperature test valve and heating test valve, through normal atmospheric temperature