A measurement system and method for laminar and turbulent flame speed of fuel under high pressure

Abstract

Disclosed is a measuring system and method for laminar and turbulent flame speeds of fuel at a high gas pressure. A measuring device for a double-cavity combustion device based on the high gas pressure, and the measuring method for the laminar and turbulent flame speeds are utilized. The measuring method comprises the steps that an inner cavity of the double-cavity combustion device is filled with combustible premixed gas of the specific fuel, an outer cavity of the double-cavity combustion device is filled with inert gas with the pressure and density equal to those of the inner cavity, electric sparks can be generated by an electrode in the center of the inner cavity through a high-voltage pulse generator so as to trigger the combustible gas to ignite, the inner cavity and the outer cavity are communicated in the moment of ignition so as to ensure that the gas pressure in each cavity is constant, a high-speed camera is triggered to conduct schlieren photographing operation, and finally the flame propagation speed of the fuel at the specific pressure is obtained through processing of flame surface propagation images; the turbulent flame speed and the laminar flame speed can be obtained through control over working or shutdown of a turbulence generator; the turbulence intensity of a flame turbulent field can be calibrated through a PIV particle tracer technology.

Description

technical field [0001] The invention relates to a measurement system and method for fuel laminar flow and turbulent flame velocity under high pressure, specifically a method for realizing flame constant pressure conditions by using a double cavity structure, and obtaining flame propagation by generating a spherical flame and capturing its flame boundary. The device and method for this important parameter of speed can realize accurate measurement of laminar and turbulent flame speeds of various gaseous fuels under different pressures, and can be used to judge their corresponding minimum ignition energy. Background technique [0002] Flame propagation velocity is an important parameter to characterize the combustion rate of combustible premixed gas, including laminar flame propagation velocity and turbulent flame propagation velocity. and scientific community's long-term and close attention. Flame propagation speed is directly related to fuel ratio, premixed gas characteristi...

AI Technical Summary

Problems solved by technology

However, the existing spherical flame velocity measuring device adopts a single chamber design. Due to the expansion of the combustion heat release gas, the pressure on the flame surface is not constant, and the flame velocity is constantly changing, resulting in inaccurate measurement, which greatly limits related research and development. application

In addition, it is difficult to measure turbulent flame velocity in traditional measuring devices due to the low uniformity of turbulent flow intensity, poor symmetry, and low controllability of flow field parameters.

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