Design method and model machine of model machine based on diesel combustion similarity theory

Abstract

The invention provides a design method of a scaling model machine based on the combustion engine similarity theory of diesel engines. The method comprises following steps: constructing a model machinecorresponding to a prototype, the model machine and the prototype have any one or any of the following relationships: geometric similarity; boundary condition similarity; media condition identity; the dimensionless piston speed remains equal at the corresponding crank angle; oil injection rules are the same; eddy current ratios are the same; delay periods are the same; influences caused by heat transfer loss are the same. The invention also provides a scaling model diesel engine made according to the above-mentioned design method of scaling model machine based on diesel combustion similaritytheory. The invention can utilize the reduced scaling model machine to reproduce the spray combustion and emission characteristics of the target prototype and map back to the prototype, thereby reducing the cost of the development process of the large diesel engine parts and the optimization process of the whole machine. At the same time, it has guiding significance for the intensive development of different cylinder diesel engine products.

Description

technical field [0001] The invention relates to the field of diesel engine and similarity research, in particular to a design method of a model machine based on the diesel engine combustion similarity theory and the model machine. In particular, the present invention belongs to the field of diesel engine and similarity research in engineering application practice, a design method of a scaling model machine based on diesel engine combustion similarity theory, those skilled in the art should be able to understand that the protection subject matter of the present invention and The corresponding protection objects are related methods and related products, and are protected through the corresponding method claims and product claims. In the preferred example, the essence of the protection is the scaling model engine based on the similarity theory of diesel engine combustion. The design method and the technical solution of the corresponding product, especially a construction method o...

AI Technical Summary

Problems solved by technology

However, in the research and development process of large diesel engines, due to their large size and high cost, it is difficult to directly use prototypes to conduct a large number of tests to complete the corresponding optimization design tasks, which makes the development process of large diesel engine combustion systems consume a lot of manpower and financial resources

Although there are international literatures trying to achieve the similarity of combustion and emissions between diesel engines of different sizes, they lack theoretical demonstrations, and there is no summary of the design method of the model engine; The patent of spray combustion and emission characteristics and mapping back to the prototype is even more blank

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