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Measuring method and device for measuring detonation resistance property of fuel

A measurement method and anti-deflagration technology, applied in the direction of chemical analysis using combustion, can solve the problems of high price, inaccurate measurement results, long test time, etc., and achieve the effects of high repeatability, easy combustion and simple operation.

Inactive Publication Date: 2014-12-31
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a measurement method and device for measuring the anti-knock property of fuel, which is used to solve the inaccurate measurement results caused by the method and device for expressing the anti-knock property of fuel based on the octane number in the prior art, and the structure of the test device is complex and expensive. Expensive, complex test methods, long test time, and large consumption of test samples, especially the above problems brought about by the determination of fuel anti-flammability properties of in-cylinder direct injection engines

Method used

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  • Measuring method and device for measuring detonation resistance property of fuel
  • Measuring method and device for measuring detonation resistance property of fuel
  • Measuring method and device for measuring detonation resistance property of fuel

Examples

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Embodiment 1

[0077] Define that the anti-knock value of n-heptane is 0, and the anti-knock value of ethanol is 100. For example, in a mixed fuel composed of 30% n-heptane and 70% ethanol, the anti-knock value of the mixed fuel is 70.

[0078] Implement the steps of the measurement described in Embodiment 1 of the present invention:

[0079] 1. Obtain the combustion delay time of the measured fuel;

[0080] (1) Preheat the combustion chamber to keep it at the temperature required for measurement;

[0081] (2) Open the compressed gas inlet valve, the compressed air will be heated after entering the combustion chamber through the heat transfer with the wall of the combustion chamber, and maintain the temperature and pressure within the range required for measurement;

[0082] (3) An appropriate amount of fuel to be tested is injected into the combustion chamber. The liquid fuel to be tested is heated, crushed, evaporated, and mixed with high-temperature air in the high-temperature and high-p...

Embodiment 2

[0090]Define that the anti-knock value of n-heptane is 0, and the anti-knock value of ethanol is 100. For example, in a mixed fuel composed of 30% n-heptane and 70% ethanol, the anti-knock value of the mixed fuel is 70.

[0091] Implement the steps of the measurement described in Embodiment 2 of the present invention:

[0092] 1. Obtain the combustion delay time of the measured fuel;

[0093] (1) Preheat the combustion chamber to keep it at the temperature required for measurement;

[0094] (2) Open the compressed gas inlet valve, the compressed air will be heated after entering the combustion chamber through the heat transfer with the wall of the combustion chamber, and maintain the temperature and pressure within the range required for measurement;

[0095] (3) An appropriate amount of fuel to be tested is injected into the combustion chamber. The liquid fuel to be tested is heated, crushed, evaporated, and mixed with high-temperature air in the high-temperature and high-pr...

Embodiment 3

[0102] Define that the anti-knock value of n-heptane is 0, and the anti-knock value of methanol is 100. For example, in a mixed fuel composed of 30% n-heptane and 70% methanol, the anti-knock value of the mixed fuel is 70.

[0103] Implement the steps of the measurement described in the embodiment of the present invention 3:

[0104] 1. Obtain the combustion delay time of the measured fuel;

[0105] (1) Preheat the combustion chamber to keep it at the temperature required for measurement;

[0106] (2) Open the compressed gas inlet valve, the compressed air will be heated after entering the combustion chamber through the heat transfer with the wall of the combustion chamber, and maintain the temperature and pressure within the range required for measurement;

[0107] (3) An appropriate amount of fuel to be tested is injected into the combustion chamber. The liquid fuel to be tested is heated, crushed, evaporated, and mixed with high-temperature air in the high-temperature and ...

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Abstract

The invention discloses a method for measuring detonation resistance property of a fuel. The method comprises the following steps: S1, selecting a reference fuel, wherein the reference fuel is a mixture fuel consisting of low detonation resistance fuel and a high detonation resistance fuel; defining a detonation resistance value according to the high detonation resistance fuel contained in the reference fuel, so as to be used as the reference for measuring the detonation resistance property; S2, using a sealed combustion chamber, injecting the tested fuel or the reference fuel into the combustion chamber, obtaining the combustion delay time of the tested fuel and the reference fuel at the same air temperature and under the same pressure condition in the combustion chamber, and obtaining the detonation resistance value of the tested fuel by using the combustion delay time of the tested fuel and the reference fuel; and S3, measuring the detonation resistance property of the tested fuel by using the detonation resistance value. By utilizing the method and the device, the detonation resistance value can reflect the detonation resistance property of the fuel in a direct injection engine better, and moreover the use method is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine combustion, in particular to a measurement method and device for measuring the anti-knock property of fuel. Background technique [0002] In spark ignition internal combustion engines, the anti-knock properties of the fuel directly determine the efficiency and operational safety of the internal combustion engine. The compression ratio of the internal combustion engine depends on the anti-knock property of the fuel. When the fuel with good anti-knock property is used, the compression ratio of the internal combustion engine can be increased accordingly, and higher efficiency can be achieved. Therefore, in the production of fuel, the anti-knock property of fuel is one of the important indicators to measure the quality of fuel leaving the factory. At present, the anti-knock property of the fuel is obtained by measuring the octane number of the fuel, which is the only standard for m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/12
Inventor 何鑫帅石金王志王建昕
Owner TSINGHUA UNIV