A spherical multifunctional constant volume bomb

Abstract

A spherical multifunctional constant volume bomb, comprising: a body with a spherical shape and more than two window holes on the body, the axis of each window hole intersects with the center of the body, and the area near the center of the sphere is a hollow test area, there are through holes pointing to the test area between the windows. The invention is simple in structure, convenient in processing, compact in structure, light in weight but capable of withstanding high strength; uniform temperature field in the test area, non-cooling seal is adopted for all sealing parts of the bomb; internal temperature and pressure are easy to control, and high temperature and high pressure can be realized Continuous testing under the following conditions; the optical system and injector are arranged flexibly, and the test range is wide, which can realize planar laser-induced fluorescence, laser absorption and scattering method, phase Doppler method, patterning, etc. for spraying, evaporation, mixing, combustion, soot generation, etc. Various test methods such as shadow method and Mie scattering, as well as the combination and simultaneous measurement of various test methods, the test light path can be arranged at any angle, which is universal.

Description

technical field [0001] The invention belongs to the technical field of heat engines, and relates to a constant-volume container for fuel spray and combustion testing, in particular to a device capable of generating a gas environment (pressure, temperature, composition) similar to a heat engine combustion chamber, suitable for fuel spray The process of atomization, evaporation, mixed gas formation, combustion and other optical tests and experiments of its various characteristics. Background technique [0002] The fuel spray characteristics of a thermal engine are one of the most important factors affecting engine performance, and for high-pressure direct injection gasoline engines, diesel engines, liquid fuel ramjet engines, gas turbines, etc., the atomization characteristics, evaporation characteristics, and mixing characteristics of fuel almost determine Engine ignition, combustion and emissions and other important performance. Therefore, obtaining and mastering the charac...

AI Technical Summary

Problems solved by technology

Constant volume bombs with this structure are mostly equipped with internal heating components, and the target temperature and its uniformity are difficult to control

And there will be an interval between the two experiments, which requires repeated cycles of inflation-heating-deflation-reinflation-reheating, the experiment takes a long time and the experiment efficiency is low

[0013] The second is that the constant-volume projectile has a complex and heavy structure, but its bearing strength is not high. For example, when the diesel engine is near the top dead center, the pressure in the combustion chamber can reach about 10MPa. Also complex and bulky, inconvenient to process

[0014] Third, the scope of testing is not wide enough

However, since the bomb-container body still adopts the conventional orthogonal polyhedron design, the angle between the axes of each window is limited to 90° or 180°, and it is difficult to realize the optical path arrangement at any angle. Dependency measurement of particle size; the phase Doppler (PDI / PDA) analyzer mentioned in the patent is used to test the droplet size (requiring that the incident light and the camera axis form an angle of 150°) is also based on the Due to the light guide groove and chamfer structure on the glass holder, the measurement range is limited, and at this time, the incident light and the outgoing light do not pass through the quartz glass vertically, and the refraction of light in the glass will cause certain errors in the test.

Furthermore, under a certain visualization window size and the strength to withstand high temperature and high pressure, the structural design of the orthogonal polyhedron will make the body structure bulky (detailed below)

Images