Method for calculating blown gas displacement of two-stroke low-speed diesel engine for boat

A calculation method, two-stroke technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of application limitations, poor versatility, difficulty in meeting different types of diesel engines, etc., to achieve strong versatility, accurate prediction, and accurate Effect of Scavenging Air Flow and Exhaust Flow

Active Publication Date: 2015-04-01
HARBIN ENG UNIV
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Problems solved by technology

However, the "rich exhaust" model is difficult to meet different types of diesel eng

Method used

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  • Method for calculating blown gas displacement of two-stroke low-speed diesel engine for boat
  • Method for calculating blown gas displacement of two-stroke low-speed diesel engine for boat
  • Method for calculating blown gas displacement of two-stroke low-speed diesel engine for boat

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Embodiment Construction

[0034] The method of the present invention will be described in detail below. Unless otherwise specified, the gas quality is that of a single cylinder and a single cycle.

[0035] The air exchange process of marine two-stroke low-speed diesel engine includes three air exchange stages: free exhaust process, scavenging process and rear exhaust process. The air distribution phase diagram of the air exchange process is shown in figure 2 . The working volume of the diesel engine at different times is very important for the calculation. The working volume V of the diesel engine cylinder at different crankshaft angles is as follows:

[0036]

[0037] In formula (1), D is the cylinder inner diameter; S is the piston stroke; ε is the geometric compression ratio, which is the basic parameter of the diesel engine; λ is the connecting rod crank ratio; Is the crankshaft angle, unit: radian, calculated according to the valve phase diagram, when the crank is at the top dead center, that is Sta...

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Abstract

The invention discloses a method for calculating blown gas displacement of a two-stroke low-speed diesel engine for a boat. The method comprises the following steps: calculating blown gas flow rate, exhausted smoke flow rate and amount of gas discharged to an exhausted smoke collection box in different stages of a ventilation process in real time by adopting a mathematic model; calculating the amount of waste gas freely exhausted in single circulation, gas input and output quantity during a gas blowing process and the amount of exhausted gas during a post-exhausting process by utilizing an ideal gas state equation in combination with a gas distribution phase position; obtaining the blown gas flow rate and the exhausted smoke flow rate according to the quantity and rotating speed of air cylinders of the two-stroke low-speed diesel engine for the boat. The method disclosed by the invention can be used for rapidly and accurately predicting the blown gas flow rate and the exhausted gas flow rate, is high in universality and provides reliable data support for analyzing the working state of the diesel engine and improving the performance of the diesel engine.

Description

Technical field [0001] The invention belongs to the technical field of engineering thermodynamics, and in particular relates to a method for calculating the scavenging volume of a marine two-stroke low-speed diesel engine, which is used for calculating the scavenging volume and smoke volume of a marine two-stroke low-speed diesel engine. Background technique [0002] The scavenging exhaust flow of marine two-stroke low-speed diesel engines is huge, which is difficult to directly measure, but the air exchange quality directly affects the exhaust gas temperature and exhaust gas loss, and has a direct and significant impact on the performance of the diesel engine. Therefore, it is very important to calculate the scavenging volume and smoke volume quickly and accurately, and then analyze and optimize the ventilation process. [0003] Due to the importance of the gas exchange process of marine two-stroke low-speed diesel engines, the research on the gas exchange process is attached grea...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 李彦军申振宇孙宝芝张国磊宋福元李晓明杨龙滨韩怀志张鹏
Owner HARBIN ENG UNIV
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