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Non-stationary high velocity jet impingement on small cylindrical obstacles

  • Basic aspects of a high velocity Diesel jet interaction with small cylindrical obstacles are presented in the paper. The phenomenon discussed in the paper lies between cylinder overflow and jet impingement on to solid wall. Especially the effect of high velocity Diesel jet “destruction” and its distribution in space are investigated in the paper. As shown, the dominant role in this process plays a fist obstacle: its diameter, distance from the nozzle outlet and injection pressure play a dominant role in characterization of the jet distribution in space. The jet spatial distribution bases on a multi-jet model. By Diesel jet impingement on a single obstacle with smaller diameter the distribution angle decreases with increasing injection pressure. For bigger obstacle the angle separating both jets increases being almost independent of the injection pressure. This angle does not change with time after impingement process, however decreases with increasing distance between nozzle and the obstacle. For Diesel jet impingement on more thanBasic aspects of a high velocity Diesel jet interaction with small cylindrical obstacles are presented in the paper. The phenomenon discussed in the paper lies between cylinder overflow and jet impingement on to solid wall. Especially the effect of high velocity Diesel jet “destruction” and its distribution in space are investigated in the paper. As shown, the dominant role in this process plays a fist obstacle: its diameter, distance from the nozzle outlet and injection pressure play a dominant role in characterization of the jet distribution in space. The jet spatial distribution bases on a multi-jet model. By Diesel jet impingement on a single obstacle with smaller diameter the distribution angle decreases with increasing injection pressure. For bigger obstacle the angle separating both jets increases being almost independent of the injection pressure. This angle does not change with time after impingement process, however decreases with increasing distance between nozzle and the obstacle. For Diesel jet impingement on more than single obstacle, the jet distribution depends on the obstacle geometrical configuration but not necessarily on the number of obstacles. As shown in the paper quite similar distribution has been obtained for three and eight obstacles configurations. Presented phenomenological model explains this observation. There is possible to design such configuration of small obstacles which permit very good charge homogenization in defined space (combustion chamber).show moreshow less

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Metadaten
Author:Miroslaw Weclas
URN:urn:nbn:de:bvb:92-opus-326
Series (Serial Number):Sonderdruck / Schriftenreihe der Georg-Simon-Ohm-Hochschule, Nürnberg (40)
Document Type:Report
Language:English
Publishing Institution:Technische Hochschule Nürnberg Georg Simon Ohm
Release Date:2009/03/19
Tag:Diesel; high-velocity; jet engine; obstacle
GND Keyword:Dieselmotor; Vergaser; Hindernis; Hochdrucktechnik
Source:Sonderdruck / Georg-Simon-Ohm-Fachhochschule, Nürnberg ; 40
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