CN-121976897-A - Vector jet flow hydrogen spraying system of hydrogen internal combustion engine

CN121976897ACN 121976897 ACN121976897 ACN 121976897ACN-121976897-A

Abstract

The invention discloses a vector jet flow hydrogen spraying system and a hydrogen jet flow spraying method of a hydrogen internal combustion engine, comprising a hydrogen sprayer and a hydrogen guide pipe assembly communicated with the hydrogen sprayer, wherein the hydrogen guide pipe assembly comprises a guide pipe communicated with the hydrogen sprayer, a rotary table rotationally connected with the guide pipe, a sleeve fixedly connected with the rotary table and a flexible spray pipe slidingly connected with the sleeve, a tensioning structure is fixedly connected on the rotary table, and the flexible spray pipe is driven to bend and stretch under the combined action of rotation of the rotary table and the tensioning structure, so that the hydrogen guide pipe assembly can freely regulate the hydrogen jet flow vector. According to the invention, the omnibearing hydrogen jet vector adjustment is realized, the hydrogen jet vector is dynamically adjusted, and abnormal combustion phenomena such as knocking and the like are controlled.

Inventors

LOU DIMING
ZHANG YUNHUA
SONG GUOFU
ZHU XIAO
FANG LIANG

Assignees

同济大学

Dates

Publication Date: 20260505
Application Date: 20260123

Claims (6)

1. A hydrogen internal combustion engine vector jet hydrogen injection system, comprising: A hydrogen injector (101) and a hydrogen conduit assembly (102) in communication with the hydrogen injector (101); The hydrogen guide pipe assembly (102) comprises a guide pipe (201) communicated with the hydrogen sprayer (101), a rotary table (202) rotationally connected with the guide pipe (201), a sleeve (203) fixedly connected with the rotary table (202) and a flexible spray pipe (205) slidingly connected with the sleeve (203); the rotary table (202) is fixedly connected with a tensioning structure, and the flexible spray pipe (205) is driven to bend and stretch under the combined action of the rotation of the rotary table (202) and the tensioning structure, so that the hydrogen jet vector of the hydrogen guide pipe assembly (102) is freely adjusted.
2. A hydrogen internal combustion engine vector jet hydrogen injection system according to claim 1, wherein the rotary table (202) is provided with a circular rotation section inside one end close to the guide pipe (201).
3. A hydrogen injection system according to claim 2, characterized in that the conduit (201) is fixedly connected with a fixed wheel piece at one end close to the rotary table (202), and the fixed wheel piece is matched with the circular rotation section.
4. A hydrogen internal combustion engine vectoring jet hydrogen injection system according to claim 1 wherein the tensioning arrangement comprises a tensioning wheel and a chord (204) fixedly connected to the tensioning wheel, the end of the chord (204) remote from the tensioning wheel being fixedly connected to the flexible lance (205).
5. A method for injecting hydrogen in calibrating hydrogen internal combustion engine vector jet flow by the hydrogen internal combustion engine vector jet flow hydrogen injection system as set forth in any one of claims 1-4, characterized in that when the hydrogen internal combustion engine is operated under a certain working condition, jet flow vectors minimizing the in-cylinder combustion cycle variation of the hydrogen internal combustion engine are searched by traversing the allowable jet flow vector strategy under the working condition, the working condition is marked and then added to an optimal jet flow vector set S opt under each working condition of the hydrogen internal combustion engine, and when the whole working condition of the hydrogen internal combustion engine is traversed, a hydrogen jet flow vector pulse spectrum S opt is formed.
6.A method for injecting hydrogen into a hydrogen internal combustion engine by a hydrogen internal combustion engine vector jet hydrogen injection system according to any one of claims 1-4, comprising the steps of identifying the working condition of the hydrogen internal combustion engine, reading a hydrogen jet vector strategy in a hydrogen jet vector pulse spectrum S opt according to the current working condition after the working condition enters a steady-state working condition, further executing the injection strategy by the hydrogen internal combustion engine vector jet hydrogen injection system through changing the operation state of a flexible jet pipe (205), adjusting the strategy to S opt-T nearby the current jet vector when knocking occurs according to a knocking sensor signal of the hydrogen internal combustion engine, and attempting to control the hydrogen internal combustion engine vector jet hydrogen injection system to inject according to S opt-T , and if knocking still exists, continuing to attempt to change S opt-T to eliminate the knocking.

Description

Vector jet flow hydrogen spraying system of hydrogen internal combustion engine Technical Field The invention relates to the technical field of engines, in particular to a vector jet flow hydrogen injection system of a hydrogen internal combustion engine. Background Abnormal combustion phenomena of hydrogen internal combustion engines mainly include pre-ignition, flashback, and knocking. Pre-ignition refers to the phenomenon in which a fresh charge, when not ignited by a spark plug, contacts some hot spot of too high a local temperature in the combustion chamber causing combustion. In the air intake process, when the air inlet valve is not closed yet, the mixed gas in the cylinder is ignited by a hot spot without being ignited by the spark plug, flame propagates into the air inlet pipe, and the abnormal combustion phenomenon is tempering. Knocking refers to the phenomenon that the mixed gas at the tail end of a combustion chamber ignites by itself due to overhigh local temperature and pressure before the flame front reaches, and severe pressure fluctuation is generated. The phenomena of preignition, backfire and knocking can have serious influence on the hydrogen internal combustion engine in normal operation, so that the output power of the hydrogen internal combustion engine is abnormal, the thermal efficiency is reduced, and even the damage to parts of the hydrogen internal combustion engine is caused. There is a close relationship between the intake system of a hydrogen internal combustion engine and abnormal combustion. The optimal design of the hydrogen injection system can have important influence on improving the hydrogen-air mixing performance of the port injection hydrogen internal combustion engine. Factors that affect hydrogen-air mixing generally include the flow of air within the intake manifold and the location of the injection of hydrogen within the manifold. Therefore, aiming at different hydrogen internal combustion engine working conditions (air flow fields in an intake manifold), the geometric structure of a hydrogen guide pipe in a hydrogen injection system is controlled, and the hydrogen jet flow vector is adjusted to promote the uniform mixing of hydrogen and air, so that the method can become a key link and an important path for solving the problem of abnormal combustion of the hydrogen engine and promoting the development of a hydrogen energy power technology. Patent 202510434957.5 proposes a device for inhibiting backfire of an air inlet channel hydrogen injection compression ignition type internal combustion engine, and relates to a device for inhibiting backfire of an air inlet channel hydrogen injection compression ignition type internal combustion engine, a hydrogen injector facing an air inlet valve is obliquely arranged in the air inlet channel, a flow blocking device is arranged below a nozzle of the hydrogen injector, an air inlet gap is arranged between the bottom of the flow blocking device and the bottom of the air inlet channel, and the risk of backfire caused by backflow of high-temperature waste gas into the air inlet channel is effectively reduced by arranging the flow blocking device below the hydrogen injector. . The hydrogen sprayer disclosed in the patent is of a traditional structure, and the occurrence of tempering is restrained by the flow blocking device, so that the uniform mixing of hydrogen and air is improved, and the hydrogen sprayer has no promotion effect. Patent 202410908946.1 proposes a hydrogen injector hydrogen injection control method, a device, equipment, a storage medium and a computer program, and discloses a hydrogen injector hydrogen injection control method, wherein the target total hydrogen injection amount is obtained according to the working condition of an engine, each hydrogen injection amount and each hydrogen injection frequency are obtained according to the target total hydrogen injection amount and a preset hydrogen injection MAP control chart, and the hydrogen injector hydrogen injection is controlled according to each hydrogen injection amount and the hydrogen injection frequency. The optimal hydrogen injection parameters are obtained through the working condition of the engine, the target total hydrogen injection amount and a preset hydrogen injection MAP control chart, the hydrogen is injected in a low hydrogen injection pressure multiple injection mode, and the starting noise caused by the hydrogen injection of the hydrogen injector is reduced while the total hydrogen injection amount under the current working condition is unchanged. The patent is a control method of a hydrogen sprayer, and mainly aims to control the spraying quantity, and the main structure of the sprayer is not improved and has no promotion effect on improving the uniform mixing of hydrogen and air. The patent 202410794064.7 proposes a hydrogen sprayer and an internal combustion engine, and discloses a hydrogen sprayer and an internal combustion engine, where