Quantitative measurement apparatus for volume fraction of soot produced by combustion in optical engine cylinder

Abstract

The invention discloses a quantitative measurement apparatus for the volume fraction of soot produced by combustion in an optical engine cylinder. According to the invention, a standard light source with known radiation intensity is used for calibrating radiation intensity of an ICCD camera equipped with a double-imaging device so as to obtain the sensitive coefficient of the ICCD camera to radiation intensity of an illuminant; a Nd: YAG laser generates high-energy laser which forms disk laser after being shaped by a battery of lenses, the disk laser enters a combustion chamber of an optical engine, and soot is heated by the disk laser and forms an incandescent light signal; and the incandescent light signal passes through a quartz window at the top of a piston, is reflected by a reflective mirror and is then collected by the ICCD camera, an image acquisition system acquires the image data of the incandescent light signal at two wavelengths, and image processing is carried out so as to obtain two-dimensional quantitative results of the volume fraction of the soot whose tangent plane is penetrated by the disk laser. The measurement apparatus provided by the invention employs the double-imaging device to realize multi-point on-line calibration and quantitative measurement of the volume fraction of soot, has a simple structure, and omits a sensor and a data acquisition device used in a traditional single-point calibration system, thereby reducing cost.

Description

technical field [0001] The invention relates to the field of quantitative measurement devices, in particular to a quantitative measurement device for soot volume fraction in the combustion process in an optical engine cylinder. Background technique [0002] Soot is one of the main harmful products in the combustion process of internal combustion engines, and it is also one of the important sources of urban air smog pollution. In order to reduce the emission of soot from internal combustion engines, it is necessary to conduct in-depth research on the mechanism of soot generation and oxidation. The effective quantitative method of soot is the basis of in-depth research. Therefore, it is important to realize the quantitative measurement of soot in the combustion process of internal combustion engines. practical significance. [0003] The laser-induced incandescent method has attracted attention due to its non-interference, high resolution, and two-dimensional measurement. Its ...

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Problems solved by technology

[0004] Quantitative measurement of the soot volume fraction in the combustion process of an internal combustion engine using the laser-induced incandescence method requires the calibration of the incandescence signal. The two-color method for calibration The laser-induced incandescence method is a new calibration method proposed in recent years. In the past, this calibration method used single-point calibration. , using two photomultiplier tubes to measure the volume fraction of soot at a point in the incandescent area, while using an ICCD (Intensified Charge Coupled Device, enhanced charge-coupled device) camera to record the signal of the entire incandescent area, and then the point The quantitative results are mapped to the entire two-dimensional incandescent area, so as to realize the two-dimensional quantitative measurement of soot. Since the measuring points of single-point calibration are fixed, it is more suitable for the measurement of soot in steady-state laminar flames, but internal combustion engine cylinders The combustion process in the cylinder is affected by the intake vortex and turbulent flow in the cylinder, which belongs to the unsteady turbulent flame. This single-point calibration method of static measuring points is difficult to achieve an effective calibration process of soot incandescence.

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