Enhancement of particle collection efficiency considering the structural interplay: particle motion characteristics analysis

Abstract

The vacuum-blowing cleaning system, utilizing positive and negative pressure mixed-delivery theory, has been adopted for the road sweeper vehicle. To enhance the solid particle separation performance and to evaluate the motion characteristics of inhaled particles under different structural parameters, the gas-solid flow in the vacuum-blowing cleaning system was investigated by using computational fluid dynamics (CFD) technology. The influence of the main structural parameters on the grade dust collection efficiency and average detention time of the inhaled particles was determined, such as suction-inlet diameter, suction-inlet inclination angle, and front baffle inclination angle. And the interplay between them was also investigated. In addition, a dust collection efficiency model was built, based on uniform design (UD) and multiple regression analysis (MRA), and subsequently verified via experiments. The results revealed that the structural parameters have significant influence on the dust collection performance. The suction-inlet diameter, front baffle inclination angle, and suction-inlet inclination angle exerted the highest, second-highest, and lowest influence, respectively. Furthermore, the interaction among structural parameters also influenced the collection performance. The highest, second-highest, and lowest levels of influence were determined for the inlet diameter/baffle inclination angle, inlet inclination angle/baffle inclination angle, and inlet diameter/inlet inclination interactions, respectively. The highest dust collection efficiency (i.e., 96.10%) and a short average detention time of particles in the chamber were realized under the following conditions: suction-inlet diameter and inclination angle: 200 mm and 110°, respectively, and front baffle inclination angle: 105°.

Numerical Study of Factors Affecting Particle Suction Efficiency of Pick-Up Head of a Regenerative Air Vacuum Sweeper

“…The k-ε model was used to accurately describe the turbulent motion of the airflow in the inlet and outlet channels of the pick-up head and to investigate the strong recirculated airflow and turbulent effects. A discrete particle model (DPM) and particle separation efficiency are used to measure the trajectory and motion velocity [8][9][10]44,45]. A numerical analysis was conducted to determine the trajectory of wood, plastic, sand, steel, and aluminum particles in the regenerative air vacuum cleaner pick-up head.…”

“…Many researchers have contributed to evaluating and improving the efficiency of road cleaners in removing particulates [6][7][8][9]. The numerical study of the factors influencing the particle removal efficiency has been performed in [10,11].…”

“…By changing the airflow rate and pressure of different inlet ducts in the centrifugal blower, it is possible to increase the particle assimilation efficiency as a result of changing the particle structure [15]. The air pressure in the pick-up head chamber changes with the diameter of the particle assimilation port, which also affects the effectiveness of the particle assimilation [8,16,17]. Measurement of the particle image speed and quality flow visualization are crucial to determining the flow areas inside the collection head of the vacuum cleaner [18].…”

Relationship between flow field characteristics and dust collection efficiency of sweeper suction port

“…The results of the study show that the new suction nozzle structure has better efficiency. For counter-blow nozzles, Xi et al [10][11][12][13] studied the effect of counter-blow nozzles on dust suction efficiency by changing their structural parameters and calculated the optimized model using a gas-solid two-phase flow model. However, some of the above papers analyse the internal airflow velocity and pressure by changing the structure size, but do not give a specific dust suction efficiency; some evaluate the dust suction efficiency by studying the particle residence time, but do not specifically analyse the causes of the effect.…”

Investigation of the Effect of Suction Mouth Design on Particle Collection Efficiency of a Vacuum Road Sweeper

“…Havanın akış hızı ve basıncı, emme verimini doğrudan etkiler [2]. Endüstride ve literatürde, süpürücülerin vakum performansının ve vakum arabası tasarımının toz emme performansına etkisinin araştırılmasına ve tasarımın iyileştirilmesine yönelik çalışmalara odaklanılmıştır [3,5,6,7].…”