摘要：Orifice jets commonly adhere to the thick-walled orifice jet mechanism or the thin-walled one, where the difference between the two orifice jet mechanisms is generally considered to be caused after the fluid enters the orifice. However, ignoring the energy loss before entering the orifice could be inaccurate and even misleading. Therefore, we studied the flow behavior in the upstream flow region of thick-walled orifices (small orifices) and thin-walled ones (large ones). Firstly, the concept of the effective upstream flow region of orifice was proposed based on the film theory. It can be simplified into an approximate hemispherical multi-channel parallel contractive flow field. Then, the experiments of the effective upstream flow region were conducted by the streamlined contractive orifices with equivalent energy loss. The proportion of the energy loss before the fluid enters the orifice to the total energy loss was obtained. In addition, the maximum impact range of the effective upstream flow region was remarked by theoretical derivation, and local resistance coefficient functions were established based on the CFD simulation results. Finally, a semi-theoretical model of energy loss in this region was developed. It can quantitatively measure the proportion of increased energy consumption caused by the sucked air inside orifice, well verifying the eddy energy consumption, which provides a scientific exclusion method for predicting the complex form resistance.

关键字：The effective upstream flow region of orifice; Energy loss; Orifice jet mechanism; Experiment; Model

ISSN号：0955-5986

卷、期、页：卷: 95

发表日期：2024-02-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：FLOW MEASUREMENT AND INSTRUMENTATION

通讯作者：宫汝景,何宾,王宏,蒋泽龙,何诗萍,张洪业

第一作者：曹睿

论文类型：期刊论文

论文概要：曹睿,宫汝景,何宾,王宏,蒋泽龙,何诗萍,张洪业，Flow field characteristics and energy loss model of the effective upstream flow region of orifice in liquid jet，FLOW MEASUREMENT AND INSTRUMENTATION，2024，卷: 95

论文题目：Flow field characteristics and energy loss model of the effective upstream flow region of orifice in liquid jet