Orthogonal experimental research on the structural parameters of a novel drill bit used for ice core drilling with air reverse circulation

Title Orthogonal experimental research on the structural parameters of a novel drill bit used for ice core drilling with air reverse circulation
Publication Type
Journal Article
Year
2019
Author(s) Pinlu Cao , Qi Zhao, Zhuo Chen, Hongyu Cao, Baoyi Chen
Journal/ Publication
Journal of Glaciology
Volume
65
Issue
254
Pagination
1011-1022
Abstract

A new type of ice core drill bit, designed with a vane swirler, was developed for ice core drilling with air reverse circulation. An orthogonal experimental design method was employed to investigate the effects of the swirler structure parameters on the reverse circulation performance of the drill bit including helical angle, number of blades, blade length and blade central angle, etc. The entrainment ratio was used to evaluate the reverse circulation effectiveness of the drill bit. The results show that the helical angle is the dominant factor regardless of whether or not the flushing nozzles are part of the design of the drill bit. The number of blades is the least important factor for the drill bit designed with the flushing nozzles (referred to as drill bit I), while the outlet area of the swirling slot is the least influential factor for the drill bit without flushing nozzles (referred to as drill bit П). In addition, the appearance of the ice core has a certain effect on the air reverse circulation for both drill bits. Within the ranges of this study, the optimal structure of the drill bit was determined based on the range analysis of the orthogonal design.

DOI
10.1017/jog.2019.76
File
URL
Categories Air Drilling (Compressed; Reverse Circulation), Drill Heads
Citation Pinlu Cao , Qi Zhao, Zhuo Chen, Hongyu Cao, Baoyi Chen ( 2019 ) Orthogonal experimental research on the structural parameters of a novel drill bit used for ice core drilling with air reverse circulation. Journal of Glaciology , 65 , 254 , 1011-1022 . doi: 10.1017/jog.2019.76
Lead Author
Pinlu Cao