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Wall guided two-stroke LPG direct injection engine PLIF visualization apparatus

A wall-guided, two-stroke technology, applied in the direction of material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems that the visualization device has not yet seen, and achieve the effect of convenient layout of laser light source, wide observation field of view, and clear distribution of images

Inactive Publication Date: 2015-07-22
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, the laser-induced fluorescence visualization device of the working process of the wall-guided two-stroke LPG direct injection engine proposed by the present invention has not yet been seen.

Method used

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  • Wall guided two-stroke LPG direct injection engine PLIF visualization apparatus
  • Wall guided two-stroke LPG direct injection engine PLIF visualization apparatus
  • Wall guided two-stroke LPG direct injection engine PLIF visualization apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: At cylinder diameter D=67mm, effective compression ratio ε = 8~8.5 two-stroke engines, the modified cylinder head 1 is equipped with longitudinal air intake 3, swirl injector 5 (nozzle diameter Ф=0.31mm, LPG injection pressure 4MPa), air intake 3 and The swirl injector 5 is arranged on the right side of the cylinder centerline 21, and the exhaust port 10 is opened above the bottom dead center of the piston on the left side of the cylinder centerline 21. Use the anti-drag dynamometer 13 to drag the lengthened piston 16 through the crank linkage mechanism 12, and also transform the cam valve mechanism, and the lengthened piston 16 reciprocates up and down once to complete a working cycle of inlet-pressure-explosion-exhaust; set the engine speed At 1000rpm, according to the determined different loads, the engine fuel injection-ignition instrument controls the LPG injection timing (°CA) and injection pulse width according to the position of the top dead cente...

Embodiment approach 2

[0026] Embodiment 2: On the basis of Example 1, when studying the combustion process, according to the crankshaft top dead center position, rotational speed and other signals, the ignition timing (°CA) of the spark plug 2 is set by the engine fuel injection-ignition instrument; When the LPG-air mixture is guided to the vicinity of the electrode of the spark plug 2 under the cooperation of the intake tumble flow, the LPG spray jet and the concave curved surface of the quartz window 17 on the top of the piston, the spark plug 2 jumps over at the set time , ignite the LPG-air mixture at the electrode gap of the spark plug 2, form flame propagation, push the extended piston 16 down, and open the exhaust port 10 at the lower part of the cylinder to discharge the exhaust gas. With the opening of the intake valve 4, fresh air with a certain pressure flows into the cylinder through the longitudinal intake port 3, and the exhaust gas is forced to flow out from the exhaust port to comple...

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Abstract

The invention relates to a laser induced fluorescence visualization apparatus wall for testing the concentration distribution and the test process of a mixed gas in a guided two-stroke LPG direct injection engine. A technical scheme adopted in the invention is mainly characterized in that a reconstructed cylinder cover is provided with a vertical air inlet channel and a high pressure swirl oil injector. The air inlet channel and the swirl oil injector are arranged at one side of the center line of a cylinder, and an air outlet is arranged above a piston bottom dead point at the other side of the center line of the cylinder. A piston reciprocates up and down once to complete entrance-press-combustion-discharge work cycle of an engine; the pit curved surface of a quartz window arranged at the top of an extended piston properly cooperates with an air inlet tumbling flow and LPG spray, and when the piston moves upward to a top dead center, LPG-air is guided to a position nearby a spark plug electrode in order to form a concentrated mixed gas easy to ignite; the wall of the extended piston is provided with a piston window corresponding to a cylinder window, and an angle between a reflector arranged in the piston window and the center line of the piston is 45DEG; and light in a combustion chamber transmits through the quartz window and is mapped to the reflector, and a high speed photographic camera is used to shoot the formation and combustion process of the mixed gas in the engine.

Description

technical field [0001] The invention relates to an engine visualization experiment device, in particular to a wall-guided two-stroke LPG direct-injection engine laser-induced fluorescence method visualization device. Background technique [0002] Optical engines can use optical visualization technology to diagnose and analyze the state of the cylinder, and provide guidance for optimizing the design of the combustion chamber and the combustion process. At present, many internal combustion engine research institutions at home and abroad have established corresponding optical engine visualization measurement platforms, and the obtained experimental results have played a necessary supporting role in the theoretical analysis of the combustion process in the engine cylinder. [0003] There have been many reports on the use of laser-induced fluorescence to study the mixture formation and combustion process of four-stroke direct-injection gasoline engines. Almost the optical engi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 许伯彦刘保龙齐运亮葛新洋
Owner SHANDONG JIANZHU UNIV
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