Method for matching fuel oil segmental injection timing with vortex in cylinder of diesel engine
A technology of segmented injection and matching method, applied in the direction of fuel injection control, mechanical equipment, engine control, etc.
Inactive Publication Date: 2012-04-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0006] Although the segmented fuel injection technology has been proposed in the 1990s, the research work has been carried out around how to reduce the harmful emissions of the engine, and the research on improving engine power through segmented fuel injection and matching with the swirl in the cylinder has not yet been seen. to report
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[0054] In this embodiment, the engine parameters are: cylinder diameter 132mm, stroke 145mm, connecting rod length 262mm, clearance height 1.3mm, compression ratio 17, ω-type combustion chamber throat diameter 99mm, combustion chamber volume 106448mm 3 . The parameters of the injector in the calculation are: the number of holes × the diameter of the hole × the included angle of the oil beam is 8 × 0.27mm × 155°.
[0055] Figure 10 The ω-shaped combustion chamber corresponds to the modeling diagram of an injection hole in the Pro / E software. A CFD three-dimensional mesh model of the ω-shaped combustor is established for comparison of simulation calculations. Figure 11 is the grid model of the ω-shaped combustion chamber in the 3D simulation software. Since the calculation uses an 8-hole injector, according to the symmetry of the calculation results, only 1 / 8 of the combustion chamber is used for grid division. According to the previous calculation experience, if the grid i...
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The invention relates to a method for matching fuel oil segmental injection timing with vortex in a cylinder of a diesel engine. By adopting the method, the matching design and control of air intake vortex and fuel oil segmental injection can be guided. The method is characterized in that the fuel oil at a pre-injection section moves out of a main injection region under the action of the vortex and rotates to clearances among adjacent main injection oil pockets, and the main injection fuel oil runs into fresh air which rotates synchronously at the time. Therefore, the method has the following beneficial effects: (1) the air in the cylinder can be utilized fully by the fuel oil so as to improve the overall uniformity of mixed air and the air utilization ratio, thus the oil injection quantity and the engine power can be increased, or the requirements for an air inlet system can be lowered, or greater power can be still generated under the conditions of thin air and reduction of air intake quantity in highlands; and (2) the heat release isochoric degree and heat efficiency are improved by means of pre-injection combustion so as to improve the power. On the basis of the existing combustion system, the matching of the fuel oil segmental injection and the vortex in the cylinder can be guided by the method; and the method is convenient to operate and is simple and practicable.
Description
[0001] The invention relates to a method for matching the fuel oil subsection injection timing in a diesel engine cylinder and the swirl flow in the cylinder. This method can guide the matching design and control of intake vortex and fuel segmented injection. The core is to make the fuel in the pre-injection section rotate at a certain angle under the action of the vortex. After the main injection section starts, the fuel and combustion products in the pre-injection section are removed. The main injection area rotates to the gap between the adjacent main injection jets, and at the same time, the fresh air outside the pre-injection area rotates to the main injection area, so that the main injection fuel still encounters fresh air. Therefore (1) the fuel can make full use of the air in the cylinder, thereby improving the overall uniformity of the mixture and increasing the air utilization rate; (2) the pre-injection combustion improves the heat release capacity and thermal efficien...
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IPC IPC(8): F02D41/30
Inventor 李向荣刘福水赵陆明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY