Device and method for simulating influence of two-stage supercharging pressure end/vortex end bypass on spray characteristics

Abstract

The invention discloses a device and method for simulating the influence of a two-stage supercharging pressure end / vortex end bypass on spray characteristics. The device comprises a pressure end bypass simulation system, a variable volume combustion bomb device and a spray photographing system. The influence of the pressure end / vortex end bypass on atomization, mixing, development history, concentration distribution and microscopic properties can be studied in a variable volume combustion bomb by using a composite laser induced fluorescence technology. According to the device and method, the influence of the pressure end / vortex end bypass on the spray characteristics when a piston approaches a top dead center can be realistically simulated, and a theoretical data support is provided for anin-depth study that spray atomization and mixing are improved after the pressure end / vortex end bypass is adopted to achieve efficient clean combustion.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a device and method for simulating the influence of two-stage supercharging pressure end / turbine end bypass on spray characteristics. Background technique [0002] With the pursuit of thermal efficiency of internal combustion engines and increasingly stringent emission regulations, single-stage turbocharging cannot meet the needs of diesel engines for large flow. In the two-stage supercharging system, the emergence of the pressure side bypass is of great significance to the two-stage supercharging system. At present, the most commonly used is to connect a bypass channel in parallel at the pressure end of the high-pressure supercharger. Its existence makes the adjustment of the intake air volume more flexible, especially for the different demands on the air volume under variable working conditions. When the bypass valve on the pressure side is opened, the gas at the ou...

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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a device and method for simulating the influence of two-stage supercharging pressure end / turbine end bypass on spray characteristics, which can solve the problem of pressure end / vortex end bypass on spray characteristics in actual internal combustion engines. Invisible problems, can more realistically simulate the impact of the pressure end / volume end bypass on the spray characteristics when the piston is close to the top dead center, and improve spray atomization and mixing after the pressure / vortex end bypass is used for in-depth research to achieve high efficiency Clean combustion provides theoretical data support

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