欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
云空化的脱落溃灭演化作为空化的一种非定常运动现象常常发生于喷嘴内，其对随后的喷雾雾化有重要影响．基于可视化试验和大涡模拟（LES）针对一个2mm方孔柴油喷嘴的准周期性云空化脱落和回射流进行研究．结果表明：流体在喷嘴入口锐边处产生流体分离，空化产生于回流区，随后流体的再附着和空化的溃灭结合产生回射流，使片空化脱落形成云空化．此外，云空化的脱落同时伴随着涡脱落，且在空化与流体界面处得到相对大的涡量．通过比对试验可知，大涡模拟可以很好地预测喷嘴内空化的初生、回射流和云空化脱落现象．
英文摘要：
Shedding of cloud cavitation in a diesel nozzle is a common phenomenon of cavitation instability. It has great influence on erosion damage and spray atomization process. However, it has not fully studied and the mecha- nism remains unclear. Visualization and large eddy simulation （LES） of diesel were carried out to study the process of periodic cloud cavitation shedding and re-entrant jet in a 2 mm-width nozzle. Numerical and experiment provide a better insight into the physical mechanism. Results show that cavitation inception is formed at the edge of inlet of the recirculation zone below the shear layer. The attached cavitation grows and shedding of cloud cavitation occurs be- cause of the re-entrant jet between cavity and wall. The dynamic mechanism causing shedding of cloud cavitation is a combination of shedding vortex. As a result, inception of cavitation, re-entrant jet and cavitation cloud shedding are accurately predicted by LES in accordance with the quantitative images observed in the experiment.
同期刊论文项目
同项目期刊论文
EFFECT OF NOZZLE HOLE SIZE COUPLING WITHEXHAUST GAS RE-CIRCULATION ON THE ENGINE EMISSIONPERFORMANCE
Visualization experiment on cavitating flow of different length-diameter ratios using diesel and bio
Experimental study of flow regime characteristics in diesel multi-hole nozzles with different struct
Effect of nozzle geometrical and dynamic factors on cavitating and turbulent flow in a diesel multi-
A numerical study of the effects of injection rate shape on combustion and emission of diesel engine
Numerical study of effect of injection parameters on combustion and emission performance of a direct
STUDY ON EFFECT OF FUEL INJECTION STRATEGY ON COMBUSTION NOISE AND EXHAUST EMISSION OF DIESEL ENGINE
Experimental study of cavitating flow inside vertical multi-hole nozzles with different length-diame
Experimental study of cavitating flow inside enlarged transparent injector nozzles and its effect on
An experimental investigation of cavitating flow in diesel injector nozzle under different back pres
期刊信息
位置：