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Sensor for injection rate measurements [Elektronski vir]Marčič, MilanA vast majority of the medium and high speed Diesel engines are equipped with multi-hole injection nozzles nowadays. Inaccuracies in workmanship and changing hydraulic conditions in the nozzles ... result in differences in injection rates between individual injection nozzle holes. The new deformational measuring method described in the paper allows injection rate measurement in each injection nozzle hole. The differences in injection rates lead to uneven thermal loads of Diesel engine combustion chambers. All today known measuring method, such as Bosch and Zeuch give accurate results of the injection rate in diesel single-hole nozzles. With multihole nozzles they tellus nothing about possible differences in injection rates between individual holes of the nozzle. At deformational measuring method, the criterion of the injected fuel is expressed by the deformation of membrane occurring due to the collision of the pressure wave against the membrane. The pressure wave is generated by the injection of the fuel into the measuring space. For each hole of the nozzle the measuring device must have a measuring space of its own into which fuel is injected as well as its measuring membraneand its own fuel outlet. During measurements procedure the measuring space must be filled with fuel to maintain an overpressure of 5 kPa. Fuel escaping from the measuring device is conducted into the graduated cylinders for measuring the volumetric flow through each hole of the nozzle.The membrane deformation is assessed by strain gauges. They are glued to the membrane and forming the full Wheatstonećs bridge. We devoted special attention to the membrane shape and temperature compensation of the strain gauges.Source: Sensors [Elektronski vir]. - ISSN 1424-8220 (Vol. 6, 2006, str. 1367-1382)Type of material - e-articlePublish date - 2006Language - englishCOBISS.SI-ID - 10794262
Author
Marčič, Milan
Topics
termodinamika |
senzorji |
dizelski motorji |
šobe |
vbrizgavanje goriva |
meritve |
thermodynamics |
sensors |
Diesel engines |
nozzles |
injection |
measurements
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Marčič, Milan | 05166 |
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