Method for calculating thermal performance of working process of air cylinder of marine main engine

A technology of ship main engine and thermal performance, applied in computing, special data processing applications, instruments, etc., can solve problems such as insufficient real-time performance

Active Publication Date: 2015-02-25
HARBIN ENG UNIV
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Problems solved by technology

In addition, some scholars have carried out numerical simulation calculations on the working process in the c

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  • Method for calculating thermal performance of working process of air cylinder of marine main engine
  • Method for calculating thermal performance of working process of air cylinder of marine main engine
  • Method for calculating thermal performance of working process of air cylinder of marine main engine

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Embodiment Construction

[0026] The technical solutions of the present invention are further described below in conjunction with specific embodiments.

[0027] Based on the mean value model, the invention uses the Seiliger cycle to divide the process of the main engine cylinder of the ship into a variable compression process, a constant volume combustion process, an isobaric combustion process and a variable expansion process, and the thermal performance parameters of each process are calculated separately.

[0028] figure 1 is the Seiliger cycle p-ψ, the abscissa ψ in the figure represents the crankshaft angle, the ordinate p represents the pressure in the cylinder, BDC is the bottom dead center, TDC is the top dead center, IC is the closing time of the scavenging hole, and EC is the closing time of the exhaust valve , EO is the opening time of the exhaust valve, 1-2 is the variable compression process, 2-3 is the constant volume combustion process, 3-4 is the isobaric combustion process, 4-5 is the ...

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Abstract

The invention discloses a method for calculating thermal performance of the working process of an air cylinder of a marine main engine. The method is based on a mean value model and a seiliger model, an isovolumetric supercharge ratio a and an isobaric pre-expansion ratio b serve as loop parameters of the seiliger model, the isovolumetric supercharge ratio a and the isobaric pre-expansion ratio b are fitted on the basis of a large number of measured data and correlation theories, and the method is applied to simulation of the working process of the air cylinder of the marine main engine. The method can be used for steady-state calculation of the working process in the air cylinder of the marine main engine, computational accuracy can be improved, and the number of parameters needed for calculation is reduced.

Description

technical field [0001] The invention belongs to the technical field of engineering thermodynamics, and in particular relates to a method for calculating the thermal performance during the working process of a main engine cylinder of a ship. Background technique [0002] The working process in the main engine cylinder of the ship includes various complex changes such as mechanical, physical, chemical, heat transfer and flow. Accurate calculation of the working process in the main engine cylinder is of great significance to improve the power and economy of the main engine. At present, the average value model is often used to calculate the in-cylinder working process of the diesel engine. The mean value model of large low-speed two-stroke diesel engine was proposed by E. Hendricks in 1989, and it is mainly used in nonlinear control and state observation of diesel engine. J.P.Jensen established an average value model with a small diesel engine as the research object. Since then...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 宋福元李基凤孙宝芝李彦军张国磊李晓明杨龙滨韩怀志张鹏
Owner HARBIN ENG UNIV
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