A system for studying the spatial structure of cellularized flames based on stereoscopic schlieren imaging technology

Abstract

The invention discloses a system for studying the spatial structure of cellularized flames based on the three-dimensional schlieren imaging technology. The system consists of constant volume combustion chamber, heating system, ignition system, synchronous control system, transient high temperature and high pressure measurement system and schlieren imaging system. Fill the fuel into the constant-volume combustion chamber, ignite the fuel with the electrode wire, record the changes of the cellular morphology of the flame through the schlieren instrument and the high-speed camera, construct the three-dimensional space structure of the cellular flame, and record the pressure and temperature data with the transient thermocouple and the pressure sensor. The invention adopts three-dimensional schlieren imaging technology, records the process of flame cellularization from multiple angles and omnidirectionally, changes the single angle of view of the traditional experimental method, and constructs a three-dimensional flame shape, which is helpful for the research of flame cellularization and flame self-acceleration, and can accurately Control the timing process between ignition, high-speed imaging and data acquisition, and input the interval and pulse width of the control signal in the synchronous control system to make the system work process more accurate and efficient.

Description

technical field [0001] The invention relates to the field of combustion flames, in particular to a system for studying the spatial structure of cellularized flames based on a three-dimensional schlieren imaging technique. [0002] technical background [0003] Spherically expanding premixed flame is an important method for measuring laminar combustion velocity and is also a typical flame form in spark ignition internal combustion engines. Under the influence of the instability of the flame itself, when the radius of the spherical expanding flame increases to a certain extent, the overall instability will occur, and a large number of cellular folds and cracks will appear on the entire flame surface, that is, the flame is cellularized. After that, the flame speed will spontaneously increase. Accelerate, and gradually present a self-acceleration law similar to turbulent flames. The increase of the flame area caused by wrinkles in this process is an important reason for the acce...

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Problems solved by technology

The increase of the flame area caused by wrinkles in this process is an important reason for the acceleration of the flame speed. However, due to the difficulty in quantifying the flame surface wrinkle cracks and the morphological characteristics of the flame cells, the existing experimental equipment often cannot intuitively reflect the internal cause and effect of these phenomena. relation

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