Experimental device for measuring single-oil-drop combustion temperature and flame structure under low-pressure condition

Abstract

The invention relates to a combustion experiment technology, and aims to provide an experimental device for measuring a single-oil-drop combustion temperature and a flame structure under a low-pressure condition. The device comprises a low-pressure cavity formed in a movable supporting frame; a bottom sealing cover of the low-pressure cavity is matched with the bottom opening through a flange surface; an observation window and an extraction opening are formed in the side surface; an oil liquid injection opening is arranged in the top cover; the bottom sealing cover is movably connected with aplatform panel of the frame platform through a vertically-arranged central threaded column and a lifting supporting column. A hand wheel is arranged at the lower end part of the central threaded column; and an electric heating wire and a thermocouple are arranged on the fixing piece on the inner side surface of the bottom sealing cover, and a plurality of joints are arranged. The device can be conveniently and quickly moved and fixed; lifting of the low-pressure cavity is adjusted through the hand wheel, continuous measurement is achieved under the condition that the position of the optical measurement system is not changed, and the stability and experiment convenience of the optical measurement system are remarkably improved. The expansibility is high, and internal modules are convenientto maintain and replace. The air tightness is good, and the repeatability of the experiment is good.

Description

technical field [0001] The invention belongs to the technical field of combustion experiments, and relates to an experimental device for measuring the combustion temperature and flame structure of a single oil droplet under low pressure conditions. Background technique [0002] Under high-altitude and low-pressure conditions, the working pressure of the combustion chamber decreases, the recirculation area of ​​the flame stabilizer decreases, the recirculation flow decreases, the turbulence intensity and Reynolds stress decrease, the turbulence scale becomes larger, and the average diameter of oil droplets increases, which is extremely unfavorable to the combustion chemical reaction , resulting in poor ignition performance and flame stability, and a significant drop in combustion efficiency. The deterioration of the combustion performance greatly reduces the thrust and specific impulse performance of the engine, which cannot even meet the power demand of the aircraft. Theref...

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Problems solved by technology

The usual structure of the current single oil droplet combustion experimental device is: the low-pressure chamber is fixed on a certain platform and cannot be moved. It is necessary to disassemble and remove the entire chamber top cover to suspend the droplet on the quartz wire inside the chamber. At one end, ignition is carried out by an immovable electric spark, the cavity is only used as a pressure control device and no optical window is set

[0004] The problems that this type of device exists are: (1) the airtightness of the low-pressure chamber is not strong, and the combustion experiment under the lower pressure cannot be carried out

(2) The expandability of the cavity of the low-pressure cavity is not enough, and the ignition and the atmosphere in the cavity cannot be precisely controlled

(3) It is difficult to disassemble the low-pressure cavity, and it is impossible to quickly and efficiently repair and replace the internal modules

(4) There is no optical window in the low-pressure chamber, and most rely on traditional contact measurement methods, which will cause damage to the measurement object when analyzing the flame structure and combustion products, and it is difficult to accurately measure the combustion characteristics such as the flame structure of oil droplets and the distribution of combustion intermediate products

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