Transparent nozzle self-circulation device for internal cavity flowing visualization research

Abstract

The invention discloses a transparent nozzle self-circulation device for internal cavity flowing visualization research. The transparent nozzle self-circulation device comprises a back pressure system, a gas circulation system, a temperature control system and a fuel injection system. The back pressure system comprises high-pressure nitrogen, a back pressure cavity, a gas flow control valve assembly and a first pressure transmitter. The gas circulation system comprises a filter, a gas circulation compressor, a pressure resistance gas cylinder, a gas control valve, a second pressure transmitter and an electronic control pressure stabilizer. The temperature control system comprises a temperature control unit and a heat exchanger and is used for ensuring that temperature in the back pressure cavity is constant. The fuel injection system comprises a proportion amplifying fuel injector and a proportion amplifying fuel spray nozzle. The problem that in the prior art, atomized diesel fuel blurs a sight window of the back pressure reception cavity is solved, so that further development of the experiment is facilitated. By the adoption of the proportion amplifying fuel spray nozzle, a visible experiment for internal flowing of the fuel proportion amplifying fuel spray nozzle of a diesel engine under the condition of certain back pressure is made to be possible.

Description

technical field [0001] The invention particularly relates to a self-circulation device for realizing the visualization research of cavitation flow inside a transparent nozzle, which belongs to the technical field of diesel engine and hydraulic cavitation. Research. Background technique [0002] Due to its excellent fuel economy, durability and low CO2 emissions, diesel engines will continue to maintain their status as the main driving force in the transportation field in the 21st century, but their development is affected by nitrogen oxides (NOx) and particulates (PM). Challenges such as high emissions and high noise. NOx and PM are produced in the combustion process. As one of the boundary conditions of combustion, fuel spray mixing has the most direct relationship with the combustion process, thus having a decisive impact on the combustion and emission performance of diesel engines. In recent years, a large number of foreign studies have shown that the cavitation phenome...

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Problems solved by technology

However, when using the above test methods to study the internal flow characteristics of the nozzle, there are the following difficulties: first, the entire test process needs to be automatically circulated and airtight, without any leakage; second, to ensure that the test bench must be continuous, safe and stable throughout the test process Operation, to ensure that the entire test process is a quasi-static process; again, the pressure must be adjustable and precisely measured during the test; finally, the processing of the transparent nozzle must ensure pressure resistance and high precision, and at the same time, it is necessary to ensure that the parts under test are easy to disassemble.

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