By Schneider B.M.

The current paintings is an experimental research of excessive strain Diesel gas sprays injected into inert environments less than evaporating and non evaporating stipulations at excessive fuel pressures.The effects extra considerably raise present wisdom and realizing of the basic tactics governing the breakup and atomization of those tran┐sient, excessive strain gas sprays and signify a close and good database for the advance and trying out of spray types in computational fluid dynamics codes. A extreme temperature and excessive strain consistent quantity cellphone used to be used as experi┐mental gadget. This combustion phone offers a versatile facility to review sprays over quite a lot of environments, together with stipulations present in Diesel engine combustion chambers. it really is outfitted with a simple configurable universal Rail Diesel injection system.Two complementary size thoughts the place used: The shadow imaging process together with acceptable snapshot processing permits the measure┐ment of the axial and radial penetration as a functionality of time. It additionally allows the visualization of buildings within the liquid section of the prompt spray. The section Doppler Anemometry method (PDA) measures concurrently the ve┐locity and dimension of person droplets at unmarried destinations within the gas spray. Scanning the dimension element over a grid of destinations within the spray permits the character┐ization of the droplet stream box constitution within the gasoline spray. the next parameter the place different within the experiments of this research: fuel pres┐sure and fuel temperature, gas injection strain, diameter and size to diameter ratio of the injection nozzle holes (the injector nozzles had continually one principal hole). This allowed for experiments with as much as ninety six parameter adaptations. The measurements of the axial gas spray penetration over the big variety of fuel stipulations during this learn convey the constraints of the corresponding versions present in the literature. most significantly, the effect of the gasoline density at the preliminary linear enlargement and the impact of the gasoline temperature at the later propagation of the gasoline spray have to be taken into account.Experimental correlations for the gas spray propagation which were built lower than non evaporating stipulations have just a restricted usefulness for the estimation of the gas spray penetration lower than genuine diesel engine stipulations. The section Doppler Anemometry measurements supply for non evaporating stipulations a regular droplet diameter of 8μm (), while lower than evaporat┐ing stipulations the droplet diameters are diminished by way of part to sizes of 4μm and no more ().The experimental facts during this research couldn't be interpreted effectively with out tak┐ing under consideration the restrictions of the utilized dimension concepts. using complementary dimension ideas within the comparable test permits a neater interpretation of the phenomena present in the size info. it's proven to boot that the producing caliber, i.e. the small adjustments within the micro geometry of the nozzles, could have a much bigger impact at the gasoline spray features than the difference of the nozzle gap dimensions itself.

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Sowohl die Messtechnik wie auch die experimentellen Bedingungen haben sich im Lauf der Zeit sehr stark verbessert: Wo früher nur die photographische Erfassung der Tropfengrössen bei relativ tiefen Umgebungsdrücken und Temperaturen möglich war, können heute dank laseroptischer Methoden auch kleinste Tröpfchen mit Durchmessern im Bereich der Wellelänge des sichtbaren Lichts unter realistischen dieselmotorischen Bedingungen gemessen werden. Leider beschränkt sich der mit optischen Messtechniken erfassbare Bereich nach wie vor auf die Randzonen resp.

Es muss beachtet werden, dass Saphir eine trigonale Kristallstruktur aufweist. Die Brechungs- und Transmissionseigenschaften von Lichtstrahlen sind also abhängig von deren Richtung im Bezug auf die Orientierung des Kristallgitters! Die eingesetzten Saphirfenster wurden aus diesem Grund an ihrem Einbauort korrekt ausgerichtet und anschliessend immer in der gleichen Lage in die gleiche Fensteröffnung eingebaut. 3 Messtechnik an der Zelle Für die Steuerung und Überwachung der Anlage werden insgesamt 14 Temperaturen und vier Drücke kontrolliert resp.

7: Düsennadel (geöffnet) Steuerraum (drucklos) Elektromagnet Steuernadel (geöffnet) Rücklauf Aufbau einer Common-Rail Einspritzdüse (dargestellt im geöffneten Zustand). 3). Die Spritzlöcher wurden mit einem Erodierverfahren hergestellt, die dabei entstandenen scharfkantigen Düsenloch-Eintrittskanten wurden in diesem Zustand belassen (keine hydroerosive Nachbearbeitung). 8 ersichtlich. Für die Anpassung der Lochlängen wurden die Düsenspitzen aussen abgeschliffen (vor dem Erodieren des Spritzlochs).

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