Method for measuring flame propagation velocity of Bunsen burner during combustion process of gaseous fuel
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A technology of flame propagation velocity and integral image, which is applied to devices using optical methods, etc., can solve problems such as low accuracy, and achieve the effects of improved accuracy, simple measurement process, and error elimination.
Inactive Publication Date: 2011-10-19
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to solve the problem of low accuracy of the measurement results of the flame propagation velocity of the gaseous fuel in the Bunsen burner flame process using the image processing technology of binarization, so as to provide the gaseous fuel based on the surface integral image processing technology Method of measurement of flame propagation velocity during combustion of bunsen burner
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specific Embodiment approach 1
[0017] Specific implementation mode 1. Combination figure 1 Illustrate this specific embodiment, the measurement method of the flame propagation velocity of the gaseous fuel based on surface integral image processing technology in the Bunsen burner combustion process, it is realized by the following steps:
[0018] Step 1, in the Bunsen burner burner 16, feed the gas fuel with a flow rate of Q, and ignite the gas fuel at the mouth of the Bunsen burner burner 16 to generate a Bunsen burner flame;
[0019] Step 2, adjust the focal length between the Bunsen burner flame and the CCD imager 17 through the focusing telescope 18 arranged at the optical input end of the CCD imager 17, and then use the CCD imager 17 to perform N times of imaging on the Bunsen burner flame to obtain N sheets image;
[0020] Step 3, perform brightness analysis on each image obtained in step 2, and perform curve fitting after edge extraction to obtain a fitted curve;
[0021] Step 4, performing surface ...
specific Embodiment approach 2
[0027] Embodiment 2. The difference between this embodiment and the method for measuring the flame propagation velocity of the gaseous fuel in the Bunsen burner combustion process based on the surface integral image processing technology described in the embodiment 1 is that the gaseous fuel is used in this embodiment. The method for measuring the speed of flame propagation in the process of burning a lamp flame is characterized in that the gaseous fuel is a mixed fuel of methane, oxygen and nitrogen.
specific Embodiment approach 3
[0028] Specific embodiment three, the difference between this specific embodiment and the method for measuring the flame propagation velocity of the gaseous fuel based on surface integral image processing technology described in specific embodiment two during the Bunsen burner combustion process is that the volume ratio of the methane is 6%~50%, the volume ratio of oxygen is 13%~70%, and the volume ratio of nitrogen is 10%~80%.
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Abstract
The invention discloses a method for measuring the flame propagation velocity of a Bunsen burner during the combustion process of gaseous fuel based on a surface integral image processing technology, relating to a method for measuring the flame propagation velocity. The invention overcomes the problem that the gas fuel has low accurate measurement result when the flame propagation velocity is measured during the Bunsen flame process by the prior binary image processing technology. The method for measuring the flame propagation velocity of a Bunsen burner during the combustion process of gaseous fuel is realized by the following steps of: igniting gaseous fuel in the Bunsen burner to generate flame of the Bunsen burner; performing N times of imaging on the flame of the Bunsen burner by a CCD imaging device; performing brightness analysis and edge extraction on each image and then performing curve fitting; performing curve integration on the area surrounded by the fit curve to obtain the superficial areas of the inner flame frontal surfaces in the flame of the Bunsen burner in each image, averaging the superficial areas to obtain the current superficial area value of the inner flame frontal surface in the flame of the Bunsen burner; and calculating the flame propagation velocity of the Bunsen burner according to the superficial area value of the inner flame frontal surface in the flame and the gas flow rate. The method for measuring flame propagation velocity of Bunsen burner during combustion process of gaseous fuel is suitably used for measuring the flame propagation velocity of the Bunsen burner during the combustion process of gaseous fuel.
Description
technical field [0001] The invention relates to a method for measuring flame propagation speed. Background technique [0002] Flame propagation velocity is the velocity at which a plane flame wave front moves through adjacent unburned gas in a direction perpendicular to its surface. Flame propagation velocity is a basic constant of combustible gas mixture, which not only has great practical significance in considering the stability of flame, but also has great theoretical value in studying the theory of flame propagation. However, the planar flame wavefront can only be obtained under very special conditions. In almost all practical cases, the flame wavefront is either distorted or not perpendicular to the airflow velocity, so it is difficult to measure it directly. Commonly used flame propagation velocity calculation methods include the Gooy flame area method, the Bunsen burner flame method, the nozzle method, and the particle tracer method. And these methods all have some...
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