Impulsmätning medelst gradvis deflektion av alla sprayer från högtrycks common rail spridare
A method for measuring the total impulse from a multi hole diesel injector, introduced inprevious thesis work, ?Development of a method and a device for measuring the momentumrate of fuel sprays?, by Mikael Lindström, has been further developed and tested. The conceptis to simultaneously deflect all sprays from a multi hole diesel injector by using a bell shapeddeflector. The fuel sprays are deflected straight down from their initial umbrella angle, andthe resulting deflection force is measured in a thin strained section of the load cell. The strainis given by three strain gauges, with quarter-bridge circuitry for each gauge. The load cell hasbeen redesigned in this thesis to lessen disturbances in the impulse measurements observed inprevious thesis. The natural frequencies of the load cell have successfully been elevated, andthe mounting has been further developed. New sources of disturbances have been identified,and a deeper insight in the measurement circumstances has been gained. Suggestions on howto avoid certain disturbances and lower others are included, together with new design andmodification proposals. A general discussion about impulse measurements is also included.