Experimental system for simulating fuel spray wetted walls

Abstract

The invention discloses an experimental system for simulating fuel spray wetted walls. The experimental system comprises a high-pressure oil pump, an oil tank, a fuel heating system, an oil sprayer, a constant-volume bomb, a constant-volume bomb heating system, a vacuum pump, a temperature sensor, a pressure sensor, external test equipment, a control system and a high-pressure oil rail. The experimental system has the advantages that oil spray wall hitting procedures in actual cylinders can be accurately simulated, a plurality of variable conditions can be controlled by the control system, comprehensive and detailed research on the fuel wall hitting procedures can be carried out, the experimental system can be matched with optical measurement equipment, accordingly, change rules of micro-variables in fuel wall wetting procedures can be intuitively reflected, and intensive research on fuel wall wetting mechanisms of engines can be carried out by the experimental system; experimental devices are easy and convenient to operate, and measurement results are important reference for improving the early spray performance of the engines.

Description

technical field [0001] The invention belongs to the technical field of engines and is mainly used for simulating the process of engine spray wet walls, in particular to an experimental system for simulating fuel spray wet walls. Background technique [0002] In order to achieve the goal of efficient and clean engine combustion, a number of new internal combustion engine combustion technologies centered on "low temperature combustion" have received widespread attention, such as homogeneous compression ignition (HCCI) and premixed compression ignition (PCCI). The early injection technology is a key technology to realize the low-temperature combustion mode of the engine. The early injection technology generally refers to injecting fuel into the cylinder at the earlier fuel injection timing (-90°~-120°CA ATDC) of the engine to Prolong the mixing time of oil and gas, reduce the combustion temperature in the cylinder, so that the combustion is more complete and the harmful emissio...

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Problems solved by technology

[0003] On the one hand, the rebounded droplets after the fuel hits the wall can achieve secondary atomization, which is conducive to the formation of a homogeneous mixture; but on the other hand, the wet wall phenomenon will also cause dilution and splashing of the lubricating oil film on the surface of the cylinder liner, and the area near the wall Too rich mixture, increased fuel consumption and other issues, affecting combustion and emissions

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