A test system for liquid phase concentration in spray section

Abstract

The invention discloses a spray section liquid phase concentration test system, which comprises a fuel supply module, a temperature and pressure boundary condition setting module, an optical path organization layout module, an image signal post-processing module and the like. Among them, the fuel supply module quickly and accurately establishes the fuel injection pressure, the signal trigger module flexibly adjusts the timing relationship between laser trigger and fuel injection trigger, and the temperature boundary condition setting module decouples the control of fuel temperature and ambient gas temperature, while adjusting the constant volume gas The environmental back pressure, the optical path organization module produces a 1mm thick slice of light to cut the spray body on a wide spatial scale, and the image signal post-processing module stores and processes the geometric information of the liquid-phase fuel concentration of the spray section online. The present invention provides a spray cross-section liquid phase concentration test system, which has short sampling time, fast response speed, high measurement accuracy, precise control of experimental working conditions, wide range of applicable fuel types, and real-time monitoring in a wide time and space range. Online feedback test.

Description

technical field [0001] The invention belongs to the field of spray optical diagnosis, and in particular relates to a test system for liquid phase concentration in a spray section. Background technique [0002] Atomization is a process in which fuel is broken into small droplets under the combined action of internal and external forces such as inertial force, air shear force, and surface tension, and then accelerates the evaporation of liquid-phase fuel to form a combustible mixture. Important physical processes in power machinery such as engines. The design of modern engines with high thermal efficiency and low emissions requires a clearer understanding of the atomization process of fuel in the cylinder and the detailed spatial distribution of fuel, so as to develop and improve the spray evaporation model and provide solid theoretical guidance for simulation work. At present, port fuel injection (PFI) and in-cylinder direct injection (GDI) gasoline engines widely use pressu...

AI Technical Summary

Problems solved by technology

However, the image brightness collected by a wide-spectrum light source cannot accurately and quantitatively characterize the liquid phase concentration, and only geometric parameters such as spray penetration distance and cone angle can be obtained.

In addition, most injectors are installed on the top, and it is difficult to obtain the transient spatiotemporal concentration distribution of the porous spray through a reasonable and simple optical path arrangement.

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