Li Yushan graduated from the Dalian Institute of Technology Marine Engineering Department in 1982. His graduation thesis is about the research and experiment of diesel engine combustion theory. He has been conducting this research for a long time.
In the combustion chamber of the new diesel engine, he believes that there are two basic contradictions in the combustion process of modern diesel engines. This is the contradiction between the atomization fineness, uniformity and diffusion degree of the fuel spray and the penetration depth; the initial combustion amount and the main combustion process The contradiction between fuel consumption. In order to solve the above contradiction and adopt measures such as intake vortex, a new contradiction of eddy current loss is generated. Therefore, how to solve the above three major contradictions is a key issue to comprehensively improve the various economic and technical indicators of diesel engines.
The process of diffusion and gasification of fuel spray in the combustion chamber of a new diesel engine combustor and the formation of a mixture of air is essentially a process of momentum transfer, mass transfer and heat transfer between the oil mist and the air. The "three-pass" process is basically carried out simultaneously. Throughout the combustion process, how the “three-pass†process determines the quantity and quality of the combustible mixture, and determines the speed and quality of the combustion process. Therefore, the ability to control the "three-pass" process between the organization's fuel spray and air is a decisive factor in controlling the combustion process of diesel engines.
There are three major momentums in the combustion chamber of the diesel engine, namely the amount of air squeezing, the amount of fuel jet flow, and the amount of combustion rush. The well-designed combustion chamber structure is the most important means to complete the organization of the three major momentums, control the "three-pass" process, and solve the three major contradictions. To complete the design of a reasonable combustion chamber structure, it must be based on a deep understanding of the three major contradictions in the combustion chamber, the three major momentums, and the motion process and motion laws of the "three-pass" process.
To this end, he proposed a controlled high atomization combustion theory and designed a super-ω-ring-type combustion chamber. The water simulation test proves that this new type of combustion chamber has a good vortex flow field, which effectively improves the combustion level of the diesel engine and avoids the eddy current loss caused by the general strong vortex combustion chamber. The test results of the actual machine bench prove that this new combustion theory and the new super-ω-ring mountain type combustion chamber can better solve the above three contradictions and achieve approximate isobaric combustion. This new type of combustion chamber effectively improves the operating condition of the direct injection diesel engine, effectively reduces the fuel consumption per unit of diesel engine, and effectively improves the economic and technical indicators of the diesel engine. It is a new type of diesel engine combustion chamber worthy of promotion.
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