Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com