Particle dispensing device for PIV based internal flow field measurement of ventilated cavity

Abstract

The invention discloses a particle dispensing device for PIV based internal flow field measurement of a ventilated cavity. A cavitator in the dispensing device includes an enclosed casing, ventilation holes are formed in the lateral side of the cativator, an air inlet pipe connected to the cativator is communicated with an internal cavity, the internal of the cativator includes a particle caching pipe, the lateral side of the particle caching pipe also includes ventilation holes, an air inlet connecting piece connected to the particle caching pipe is communicated with the cavity, the cavity is formed between the external surface of the particle caching pipe and the internal surface of the cativator, an external pipeline is connected with a particle storage pipe, particles are supplemented timely via two control valves and an air source, and thus, the particles can be dispensed continuously and uniformly. The particle dispensing device can be used for researches on ventilation cavitation of different appearances, and provides convenience for measurement and application of a PIV system.

Description

technical field [0001] The invention relates to a PIV measuring device, in particular to a detachable particle spreading device for measuring the internal flow field structure of a ventilation cavity, and belongs to the technical field of PIV measuring devices. Background technique [0002] Ventilated cavitation, as an effective drag reduction method, is one of the research hotspots in the field of underwater weapons at present. The study of the internal flow field structure of ventilated cavitation has important theoretical significance and application value. However, due to the complexity and heterogeneity of the cavitation flow field structure, comprehensive and in-depth experimental research is very difficult. At present, the PIV measurement of the ventilated cavitation flow field can only obtain the flow details of the flow field around the ventilated cavity. Meticulous measurement of structure lacks effective means and methods. This is caused by the working principle ...

AI Technical Summary

Problems solved by technology

The commonly used tracer particles in PIV test in the air flow field mainly include titanium dioxide or magnesium particle smoke and olive oil or paraffin oil droplets, etc., but for the supercavitation flow field test due to the large humidity in the flow field to be tested and the ventilation system and pressure difference, small particles of smoke or oil mist coagulate with each other, resulting in insufficient particle concentration in the cavitation or even unable to enter the internal flow field of the cavitation, and its visibility is poor, and it is impossible to accurately capture the internal flow field structure of the supercavitation

Wosnik M, et al.Experimental study of a ventilated supercavitating vehicle[C] / / Fifth International Symposium on Cavitation (CAV2003). Osaka, Japan, 2003, this document records that the tiny bubbles formed by cavitation in water are used as tracer particles , using DPIV (Digital Particle Image Velocimetry) digital particle imaging velocimetry technology to test the water flow field at the tail of the ventilated supercavitation, and successfully obtained the velocity distribution of the water flow field at the tail of the ventilated supercavitation under cavitation conditions, but the bubble particles It can only be used in the water flow field, but not in the gas flow field, and cannot obtain the internal flow field structure of the cavity

In the 17th issue of "Ship Mechanics" in 2013, the PIV test method for the internal flow field of ventilated supercavitation (authors: Zhong Xiao, Wang Shushan, Ma Feng, Zhang Mindi) uses a fluidized bed to fully mix solid particles and gases, and then pass The ventilation pipeline transports particles, but the use of a fluidized bed to spread solid particles requires high design requirements for the ventilation pipeline, and the drastic changes in the ventilation pressure and flow velocity during the transportation process will easily cause the particles to accumulate in the low flow velocity area, thereby clogged vent line

Chinese patent application: Application No. (201510116756.7) of "A Particle Dispersing Device Inside a Cavitator". can't continue

Images