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A Gas Fuel Injection System with Fixed Pressure and Variable Position

A gas fuel, fixed pressure technology, applied in the measurement of fluid pressure, liquid/fluid solid measurement, combustion chamber and other directions, can solve the problems of dynamic change of difficult injection position, difficult control of system error, complex system, etc. Adjusting injection pressure, suppressing combustion oscillation, and fast response of switching speed

Active Publication Date: 2022-06-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult for the two commonly used injection methods to achieve dynamic changes in the injection position during the test
However, in a small number of test systems that study series / parallel injection strategies, the air sources of different channels are independent of each other, the system is relatively complex, and it is very difficult to maintain a completely constant pre-spray pressure during the conversion of working conditions. The systematic error of the test not easy to control

Method used

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  • A Gas Fuel Injection System with Fixed Pressure and Variable Position
  • A Gas Fuel Injection System with Fixed Pressure and Variable Position

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] In the test preparation stage, the solenoid valve is reset and is in a closed state; the switch of the high-pressure gas cylinder 11 is turned on, and the downstream pressure reducing valve 12 is manually adjusted to ensure that the downstream pressure is the design value; the working sequence of the valve is written as follows figure 2 As shown, the timing at which the first solenoid valve 21 and the second solenoid valve 22 are opened and closed is set. During the test, when t0 When the first solenoid valve 21 is opened, the second solenoid valve 22 is closed, and the gas fuel in the high-pressure gas cylinder 11 enters the cavity from the first injector 25 through the pressure reducing valve 12, the first solenoid valve 21 and the one-way valve 23 in sequence. The combustion chamber, at this time, the injection position is far away from the cavity, and the first pressure sensor 31 and the first flow meter 33 respectively record the pre-injection pressure and flow of ...

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PUM

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Abstract

The invention relates to a gas fuel injection system with fixed pressure and variable position, belonging to the field of fuel injection systems. The invention consists of a high-pressure ethylene gas source, a pressure reducer, a solenoid valve, a one-way valve, an injector, a tee, a connecting pipeline, a pressure sensor, a flow meter, a controller and a measurement and control computer. The above parts constitute the two major systems of transportation and measurement and control, which realize the function of keeping the fuel injection pressure constant during the engine working process and dynamically switching the injection position, thereby simulating the unsteady switching process of the turbulent flame during the transition stage of the scramjet engine. , which solves the problem of fuel injection with fixed pressure and adjustable position in the engine combustion chamber. It has the advantages of stable injection pressure, fast response, simple system, low cost, good safety and stable work.

Description

technical field [0001] The invention relates to a gas fuel injection system, in particular to a gas fuel injection system that maintains constant pressure and dynamically switches positions. Background technique [0002] The rapid development of hypersonic propulsion technology has put forward wider requirements for the range of Mach number and flight altitude that the scramjet can work stably. Under such flight conditions, the inlet parameters of the engine inlet, especially the air flow, total temperature and dynamic pressure, change drastically, which puts forward higher requirements for the flame stabilization capability of the engine cavity combustion chamber. In the experiment, the fuel injection scheme is often adjusted or the profile is changed to match the combustion performance of the engine under different flight conditions. However, the adjustment of the inner profile of the engine under working conditions is difficult to achieve in engineering; in comparison, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23R3/28G01L11/00G01F1/00
CPCF23R3/28G01L11/00G01F1/00
Inventor 刘朝阳贾东鹏潘余王宁马磊
Owner NAT UNIV OF DEFENSE TECH