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| An Experimental Study on the Internal and Near Field Flow Characteristics of Internal/External Intersecting Hole Nozzles |
| DOI： |
| Key Words:nozzle intersecting hole impingement impact angle internal flow near field spray |
| Author Name | Affiliation | | JIN Yu,LENG Xianyin,CHEN Guangping，WANG Qian,HE Zhixia | 1.Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
2.Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
3.CSSC Marine Power Co., Ltd., Zhenjiang 212002, China |
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| Abstract:In order to understand the internal cavitation flow and near field spray characteristics of injector nozzles with internal/external intersecting holes, three types of nozzles, including two different intersecting hole nozzles and one conventional cylindrical hole nozzle were visualized by using high speed photography at different injections pressures, sub-hole impact angle and sub-hole center to center distance. Results show that, unlike the paraxial symmetric spray from the conventional cylindrical hole nozzle, the internal/external intersecting hole nozzle can create a fan shaped spray due to internal/external spray impingements. As observed, the spray from the external intersecting hole nozzle shows a very intensive radial diffusibility followed by that of the internal intersecting hole nozzles and both of which are more diffusible than that of conventional cylindrical hole nozzle. In addition, as the injection pressure increases, the conventional nozzle produces cavitation at 0.3 MPa, which rapidly develops into a hydraulic plunger flow, and the external intersecting hole nozzle also generates cavitation at 0.3 MPa, but no hydraulic plunger flow occurs at 0.1 MPa. While the internal intersecting hole nozzle has no cavitation at all. |
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