Calculation method of thermal performance of marine main engine cylinder working process

A technology of ship main engine and thermal performance, which is applied in calculation, special data processing applications, instruments, etc., can solve the problems of insufficient real-time performance, achieve the effect of reducing calculation complexity and improving calculation accuracy

Active Publication Date: 2017-09-08
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 cylinder based on GT-Power, Fire, KIVA and other software, but there are deficiencies in real-time performance.

Method used

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  • Calculation method of thermal performance of marine main engine cylinder working process
  • Calculation method of thermal performance of marine main engine cylinder working process
  • Calculation method of thermal performance of marine main engine cylinder working process

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Embodiment Construction

[0026] The technical solutions of the present invention will be further described below in combination with specific embodiments.

[0027] Based on the mean value model, the invention uses the seiliger cycle to divide the operation process of the ship's main engine cylinder into a variable compression process, a constant volume combustion process, an isobaric combustion process and a variable expansion process, and calculates the thermal performance parameters of each process respectively.

[0028] figure 1 It 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 time when the scavenging hole is closed, and EC is the time when the exhaust valve is closed , 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 pr...

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Abstract

The invention discloses a method for calculating the thermal performance of a marine main engine cylinder in the working process. The invention is based on an average value model and a seiliger model, and takes the equal-volume pressurization ratio a and the equal-pressure pre-expansion ratio b as the cycle parameters of the seiliger model, based on a large number of measured data and related theories to fit the equal-volume supercharging ratio a and the equal-pressure pre-expansion ratio b, and apply it to the simulation of the working process of the ship's main engine cylinder. The invention can be used for the steady-state calculation of the working process in the cylinder of the main engine, can improve the calculation accuracy, and reduce the parameters needed for the calculation.

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 of a ship main engine cylinder in the working process. Background technique [0002] The working process in the main engine cylinder of a ship includes various complex changing processes such as machinery, physics, chemistry, 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 working process in the cylinder of a diesel engine. The average value model of a 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 engines. J.P.Jensen established the average value model with the small diesel engine as the research object. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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