System and method for measuring spray micro-characteristics in constant-volume combustion device

Abstract

The invention discloses a system and a method for measuring spray micro-characteristics in a constant-volume combustion device. The system comprises the constant-volume combustion device, a fuel supply system, a digital delay generator and a phase Doppler particle analyzer, wherein the fuel supply system is provided with a controller; the constant-volume combustion device comprises a box and an incendiary bomb body, the incendiary bomb body is provided with four observation holes in through hole shapes, axes of the observation holes are located in the same horizontal plane, an angle between the axes of two observation holes is 180 degrees, an angle between the axes of the other two observation holes is 160 degrees, optical observation windows are mounted at the observation holes, and a connection hole communicated with the fuel supply system is arranged right in the upper part of the middle of the constant-volume combustion device; the controller is connected with the digital delay generator; an output end of the digital delay generator is connected with the phase Doppler particle analyzer. With adoption of the measurement method using the measurement system, the spray micro-characteristics can be measured in the constant-volume combustion device.

Description

technical field [0001] The invention relates to the field of constant-volume combustion devices, and more specifically relates to a measurement system and method for spray microscopic characteristics of constant-volume combustion devices. Background technique [0002] In the field of internal combustion engines, the atomization process of fuel directly affects the combustion and emission performance, thereby contributing to the alleviation of energy and environmental problems. Therefore, for internal combustion engine researchers, it is necessary to obtain fuel spray characteristics (jet breakage length, spray cone angle, oil droplet size and velocity, etc.) and its relationship with surrounding environmental parameters (pressure, temperature, ambient gas type and density, etc.) , and then establish the kinetic mechanism of fuel atomization reaction, and finally provide basic data for engine spray simulation and optimization, which is the main purpose of fuel injection atomi...

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Problems solved by technology

[0004] Some existing spray characteristic measurement systems and methods can only measure the macroscopic or microscopic characteristics of the spray in an open space, or can only measure the macroscopic shape of the spray in a constant volume combustion device, and cannot cooperate with advanced optical measuring instruments. Microscopic characteristics (including particle size distribution information and velocity distribution information of spray particles), such systems and methods obviously cannot meet the requirements of the test

This limitation severely hinders the study of the broken atomization depth of fuel

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