Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Applied Sciences

Qilei Yin¹  Dongyu Wu¹  Xinxin Zhang¹  Pengfei Zhang¹  Dong Ge¹  Kun Yin¹  Jingqing Cheng¹ 

[1] College of Construction Engineering, Jilin University, Changchun 130026, China;

关键词: supersonic nozzle;    reverse circulation;    dust control;    entrainment ratio;    shock strain;   

DOI  :  10.3390/app7010005

来源: DOAJ

【 摘 要 】

To reduce dust generated from drilling processes, a reverse circulation drilling method based on a supersonic nozzle is proposed. The suction performance is evaluated by the entrainment ratio. A series of preliminary laboratory experiments based on orthogonal experimental design were conducted to test the suction performance and reveal the main factors. Computational fluid dynamics (CFD) were conducted to thoroughly understand the interaction mechanism of the flows. The Schlieren technique was further carried out to reveal the flow characteristic of the nozzle. The results show that the supersonic nozzle can significantly improve the reverse circulation effect. A high entrainment ratio up to 0.76 was achieved, which implied strong suction performance. The CFD results agreed well with experimental data with a maximum difference of 17%. This work presents the great potential for supersonic nozzles and reverse circulation in dust control, which is significant to protect the envrionment and people’s health.

【 授权许可】

Unknown