Light extinction method on high-pressure diesel injection
- Univ. of Wisconsin, Madison, WI (United States). Engine Research Center
A two dimensional optical diagnostic technique based on light extinction was improved and demonstrated in an investigation of diesel spray characteristics at high injection pressures. Traditional light extinction methods require the spray image to be perpendicular to the light path. In the improved light extinction scheme, a tilted spray image which has an angle with the light path is still capable of being processed. This technique utilizes high speed photography and digital image analysis to obtain qualitative and quantitative information of the spray characteristics. The injection system used was an electronically controlled common rail unit injector system with injection pressures up to 100 MPa. The nozzle of the injector was a mini-sac type with six holes on the nozzle tip. Two different injection angle nozzles, 125{degree} and 140{degree}, producing an in-plane tilted spray and an out of plane tilted spray were investigated. The experiments were conducted on a constant volume spray chamber with the injector mounted tilted at an angle of 62.5{degree}. Only one spray plume was viewed, and other sprays were free to inject to the chamber. The spray chamber was pressurized with argon and air under room temperature to match the combustion chamber density at the start of the injection. The experimental results show that the difference in the spray tip penetration length, spray angle, and overall average Sauter mean diameter is small between the in-plane tilted spray and the out of plane tilted spray. The results also show that in-plane tilted spray has a slightly larger axial cross-section average Sauter mean diameter than the out of plane tilted spray.
- OSTI ID:
- 220765
- Report Number(s):
- CONF-950793-; ISBN 0-8194-1905-2; TRN: IM9620%%159
- Resource Relation:
- Conference: 40. annual meeting of the Society of Photo-Optical Instrumentation Engineers, San Diego, CA (United States), 9-14 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Optical techniques in fluid, thermal, and combustion flow; Cha, S.S.; Trolinger, J.D. [eds.]; PB: 601 p.; Proceedings/SPIE, Volume 2546
- Country of Publication:
- United States
- Language:
- English
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