Compression end point temperature adjusting method for fast compressor in lab

A technology of end point temperature and adjustment method, which is applied in the simulation of internal combustion engine compression stroke and in the field of combustion, can solve the problems of increasing the volume of the combustion chamber, limitation, and difficulty in achieving a high pressure of the mixed gas, so as to save time, reduce initial pressure, eliminate wear and tear. The effect of changes in the experimental initial conditions

Active Publication Date: 2019-01-29
永春县产品质量检验所福建省香产品质量检验中心国家燃香类产品质量监督检验中心福建
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Problems solved by technology

In this way, a smaller compression ratio is required to achieve a lower compression end temperature, that is, to increase the volume of the combustion chamber at the end of compression. For some fuels with a l

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  • Compression end point temperature adjusting method for fast compressor in lab
  • Compression end point temperature adjusting method for fast compressor in lab

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Embodiment Construction

[0029] The invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] For different research objects and experimental conditions, the improvement effect of this method is not the same. The following is illustrated in conjunction with specific examples. For a combustible mixture composed of n-heptane, oxygen, and diluent gas, under the conditions of equivalence ratio 1.0, dilution ratio 3.72, and compression end pressure of 20 bar, it is desired to adjust the compression end temperature of the combustible mixture from 850K to 750K.

[0031] 1) The specific heat capacity ratios of n-heptane, oxygen, argon, and nitrogen are found to be γ1, γ2, γ3, and γ4 in the material thermodynamic parameter manual.

[0032] 2) According to the equivalence ratio and the dilution ratio, determine the volume ratios of n-heptane, oxygen, and diluent gas in the total combustible mixture as X1, X2, and Xd, respectively. There is X1+X2+Xd=1.

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Abstract

The invention discloses a compression end point temperature adjusting method for a fast compressor in a lab. The method comprises the following steps that 1 ) determining the components of combustiblemixed gas in an experiment of the fast compressor; 2 ) determining the total pressure of the combustible mixed gas in a combustion chamber to be P, and calculating the corresponding partial pressurePi = P * Xi according to volume fraction of each gas; 3 ) after evacuating a gas mixing tank, filling the gas sequentially according to the corresponding gas partial pressure to complete the configuration of the combustible gas mixture; 4 ) compressing the combustible mixed gas for one step, and recording the pressure change in the combustion chamber ; 5 ) calculating is carried out according to an ideal gas heat insulation formula to obtain the compression end point temperature Tc of the experiment; and 6 ) replacing a part of argon in diluent gas with nitrogen, repeating the steps 3 )-5 ), and obtaining a compression end point temperature which is lower than the first time. According to the method, under the condition that the structure of an existing experimental device is not changed,the compression end point temperature is changed by changing the diluent gas component in the mixed gas, so that the experimental working condition range is effectively widened.

Description

technical field [0001] The invention belongs to the fields of compression stroke simulation and combustion of internal combustion engines, and in particular relates to a method for adjusting the temperature at the end of compression of a rapid compressor in a laboratory, which is used for basic experiments for studying the ignition characteristics and flame propagation characteristics of fuel compression ignition. Background technique [0002] The rapid compressor experimental device can study the self-ignition characteristics of a certain composition of combustible mixture under different working conditions. Specifically, the combustible gas is rapidly compressed to reach the specified initial temperature and pressure in a short period of time. The gas will self-ignite, and this period is the ignition delay period of the fuel under this working condition. The measurement of the ignition delay period data is of great help to the development of the chemical reaction kinetic mo...

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Application Information

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IPC IPC(8): F04B51/00
CPCF04B51/00
Inventor 刘洋汤成龙黄佐华
Owner 永春县产品质量检验所福建省香产品质量检验中心国家燃香类产品质量监督检验中心福建
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