Hanging drop protection cover automatic separation device and method

Abstract

The present invention relates to a hanging drop protection cover automatic separation device. The device comprises a clamping body, a hanging device, a protective cover connection rod and the like. The left and right sides of the clamping body are provided with support lugs, and the upper and lower surfaces of the clamping body are provided with a middle through hole and a side through hole; the front side of the clamping body is provided with a fastening hole and a regulation hole; the hanging device comprises a metal rod and a quartz frame; the tail end of the metal rod is fixedly connectedwith the top plate of the quartz frame; the metal rod penetrates the middle through hole, and is fixed through a fastening screw in the fastening hole; the protective cover connection rod penetrates the side through hole and is regulated through a regulation screw in the regulation hole; the middle section of the protective cover connection rod is provided with a supporting rod being perpendicularto the protective cover connection rod, and a positioning screw is fixed on the supporting rod; an inlet panel is fixed at the upper portion of a high-temperature cavity and is located below the positioning screw; the bottom end of the protective cover connection rod is fixedly connected with the top end of a quartz glass cover; and a through hole configured to put a thermocouple is formed at themetal rod, the middle portions of the quartz frame and the quartz glass cover. The hanging drop protection cover automatic separation device allow the drop to be closer to the state of an initial position at a target position when evaporation starts.

Description

technical field [0001] The invention relates to the technical field of evaporation and combustion of fuel oil droplets in a high temperature and high pressure environment of an internal combustion engine, in particular to an automatic separation device for a hanging droplet protection cover. Background technique [0002] Diesel engines are widely used in transportation vehicles, ships, agricultural machinery, military equipment and other fields. The spray combustion process in the cylinder of diesel engines is very complicated, including injection, atomization, evaporation, mixing, and combustion. combustion efficiency. For this reason, scholars at home and abroad have done a lot of research on the atomization evaporation of fuel oil and the mixing of oil and gas, and designed a single droplet evaporation and combustion experimental device. At present, the experimental devices for single droplet evaporation and combustion are mainly divided into "hanging drop method" and "f...

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Problems solved by technology

However, this method also has some problems in the suspension of droplets and droplet transportation: (1) If the fuel is suspended on the quartz wire through the transportation pipeline in a high-temperature, high-pressure closed environment; this process will heat the pipeline and thereby Increasing the initial temperature of fuel oil will affect the experimental results

At present, the temperature required for the evaporation experiment environment is generally 800°C. When it is at 800°C, the entire experimental process takes no less than 3s. The "flying drop method" and "hanging drop method" hang the droplet from room temperature within 3s at 800°C. Heating from 20°C to 240°C, the internal pipeline is heated from room temperature 20°C to 130°C; at the same time, the number of experiments is at least twice when performing the repetitive comparative experiment. In the environment, the internal pipeline temperature of the "flying drop method" and "hanging drop method" rises to 190°C, reaching the boiling point of light component diesel; (2) the "hanging drop method" droplet suspension device is fixed, and the fuel is propelled by the propulsion device In the delivery pipeline, a part of the pipeline is exposed to the inside of the high-temperature chamber, which will cause the temperature of the pipeline to rise rapidly, and the temperature of the fuel oil will reach the boiling point of diesel oil, which will not only affect the experimental results, but also cause the rapid aging of the delivery pipeline at high temperature; "Flying drop method "Let the fuel fly from the outside of the high-temperature chamber into the observation position of the high-temperature chamber under the action of gravity, which avoids a high temperature rise of the fuel, but due to the effect of gravity, the fuel droplet will become a water droplet instead of a true spherical shape, resulting in a droplet volume measurement error of up to 8 %; (3) The diameter of suspended droplets is generally greater than 1mm, while the diameter of droplets in the cylinder of an internal combustion engine is mostly 20-30um, which cannot accurately simulate the evaporation of droplets in the cylinder environment, and cannot realize the research on the evaporation and combustion characteristics of tiny droplets , so being able to suspend smaller droplets is critical to the accuracy of the experiment

[0003] It can be seen that no matter it is the "hanging drop method" in a high-temperature confined space or an open space, it is impossible to hang droplets with a diameter of less than 0.5mm, and the "flying drop method" has a large experimental error due to droplet deformation.

At present, few people use the suspension method of tiny droplets, and no one has proposed a suspension droplet protection and automatic separation device.

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