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3305D injector insert showing comparison nebular and jet stream pattern with high and low pressure. Top image shows correct hollow cone-shaped aerosol effect, from central 6mm orifice, that is also creating a fine mist around and within the cone, and steady steams emanating from cooling pores. Bottom image shows the effect of reduced pressure: a dropping poorly formed cone, composed of larger slower moving droplets, and a tendency for the thicker spray to combine and cause ‘dribbeling’ with much fluid failing to clear the injector face – unlike the image above, where the injector face is clear of drips.

Album: Testing fuel injectors

Categories: Combustion

Tags: #Test procedures #Combustion and injection #Propellent injector system

Image shows a correctly formed nebular cone attended by a fine mist. the four injector cooling jets are well shown, and although fluid beading can be seen on the face of the injector, there is insufficient liquid to cause dripping.

Album: Testing fuel injectors

Categories: Combustion

Tags: #Test procedures #Combustion and injection #Propellent injector system

Single fuel injector water test rig showing a 3305D bress insert about to be tightened home using a pin-wrench. V2RH image

Album: Testing fuel injectors

Categories: Combustion

Tags: #Test procedures #Combustion and injection #Propellent injector system

3304D higher volume injector insert (with central jet) showing comparison nebular and jet stream pattern with high and low pressure. Top image shows correct hollow cone-shaped aerosol effect from central 6mm orifice, that is also creating a fine mist around and within the cone, and strong single central (non-swirl) jet can be seen as well as 4 steady steams emanating from cooling pores. Bottom image shows the effect of reduced pressure: a dropping poorly formed cone, composed of larger slower moving droplets, and a tendency for the thicker spray to combine and cause ‘dribbeling’ with much fluid failing to clear the injector face. The appearance of central jet however seem largely unchanged.

Album: Testing fuel injectors

Categories: Combustion

Tags: #Test procedures #Combustion and injection #Propellent injector system

Parts of the ‘Standard’ series A aluminium head from 1941. The brass injector insert type and position pattern on the relics seem to be of the standard type but the pattern is non-standard in that higher volume injectors with three inlet apertures (two centrifugal and one central) have been place nearest the LOX
injector. Photo courtesy Horst Beck

Album: A4-V2 Injection head, combustion chamber, and nozzle

Categories: Combustion

Tags: #Combustion and injection #Propellent injector system